cutler-hammer instructionsfordigitriprms810tripunit

Cutler-Hammer I.L. 29-888A

Instructions for Digitrip RMS 810 Trip Unit

Page1.0 General Description - Digitrip RMS 810 Trip U n i t . . . . 21.1 Basic Digitrip RMS 810 Trip Unit1.1.1 Operational Status and Protection TRIP

Indicators1.1.2 General Over-Current Protection1.1.3 Discriminator (High Initial Current Release) (For Types

LS and LSG Trip Units only)1.1.4 OVERRIDE (Fixed Instantaneous)1.1.5 Zone Interlocking1.2 Four Character Information Display Window1.2.1 Values Displayed During Normal Service1.2.1.1 Instrumentation - Current Values1.2.1.2 Instrumentation - Power and Energy Values1.2.2 Messages Displayed After ALARM or TRIP1.2.2.1 ROM Error...See I.L1.3 Frame Rating, Sensor Rating (where applicable) and

Rating Plugs1.4 Power / Relay Module1.5 Potential Transformer Module1.6 Auxiliary Power Module2.0 UL Listed Devices3.0 Protection Settings3.1 General3.2 Long Delay Current Setting3.3 Long Delay Time Setting3.4 Short Delay Current Setting3.5 Short Delay Time Setting3.6 Instantaneous Current Setting3.7 NO Instantaneous Current Setting3.8 Ground Fault Current Setting3.9 Ground Fault Time Delay Setting4.0 Test Procedures4.1 General4.2 When To Test4.3 Testing Provisions4.4 Conducting Tests4.4.1 Not Tripping the Breaker4.4.2 Tripping the Breaker ;4.5 Testing the Back-up Battery (Inside the Rating Plug) 204.5.1 Back-up Battery Check4.5.2 Replacing the Back-up Battery5.0 Communications5.1 Trip Unit Address and Baud Rate5.2 Remote Master Computer5.3 Assemblies Electronic Monitor (AEM). . .5.4 Remote Master Computer and AEM Both5.5 INCOM, Network Interconnections5.6 Information Communicated by Digitrip RMS 810 . . . 26

Table of Contents System Power Factor (Remote)Remote Closing and Tripping of Circuit Breakers . . . 27Remote Resetting of the Trip UnitReferencesDigitrip RMS Trip Assemblies . . .Type DS Low-Voltage AC Power Circuit Breakers . . 28Type SPB Systems Pow-R BreakersSeries C, R-Frame Molded Case Circuit Breakers . . 28Assemblies Electronic MonitorsINCOM, and IMPACC, Communications

Lists of Figures, Tables, and Appendices

5.7 275.8

275.92286.0

6.1 2826.236.3 286.446.5 2856.6 285

7 2878

WARNING89

10 DO NOT ATTEMPT TO INSTALL OR PERFORM MAIN-TENANCE ON EQUIPMENT WHILE IT IS ENERGIZED.DEATH OR SEVERE PERSONAL INJURY CANRESULT FROM CONTACT WITH ENERGIZED EQUIP-MENT. ALWAYS VERIFY THAT NO VOLTAGE ISPRESENT BEFORE PROCEEDING WITH THE TASK,AND ALWAYS FOLLOW GENERALLY ACCEPTEDSAFETY PROCEDURES. CUTLER-HAMMER INC. ISNOT LIABLE FOR THE MISAPPLICATION OR MISIN-STALLATION OF ITS PRODUCTS.

11121314141414151515 It is strongly urged that the user observe all recommen-

dations, warnings and cautions relating to the safety ofpersonnel and equipment, as well as all general and localhealth and safety laws, codes, and procedures.The recommendations and information contained hereinare based on experience and judgment, but should notbe considered to be all-inclusive or covering every appli-cation or circumstance which may arise. If you have anyquestions or need further information or instructions,please contact your local representative, or the CustomerSupport Center for the type of circuit breaker you have.

151616161717171818192020

CircuitBreakerTypeDS/DSLSPBSeries CR-Frame

CallTelephoneNumber(412) 937-6029(412) 937-6029(412) 937-6490

Send toFAXNumber(412) 937-6396(412) 937-6396(412) 937-6010

2121212123252525

F:T*IVEffective May 1997. Supersedes I.L. 29-888 dated June 1994

www.nationalswitchgear.com

Courtesy of NationalSwitchgear.com

I.L 29-888A

1.0 GENERAL DESCRIPTION - DIGITRIP RMS 810TRIP UNIT

carrying current. These current signals develop analogvoltages across the appropriate calibrating resistorsincluding:

1) Phase currents2) Ground current or Neutral current (when supplied)3) Rating plugThe resulting analog voltages are digitized by the customdesigned integrated circuits. The micro-computer, incyclic fashion, repeatedly scans the voltage valuesacross each calibrating resistor and enters these valuesinto its Random Access Memory (RAM). These data areused to calculate true RMS current values, which arethen repeatedly compared with the protection functionsettings and other operating data stored in the memory.The software program then determines whether to initiateprotection functions, including tripping the breakerthrough the low energy trip device (Flux Transfer ShuntTrip or Direct Trip Actuator) in the circuit breaker.

1.1 Basic Digitrip RMS 810 Trip UnitThe Digitrip RMS 810, illustrated in Fig. 1, is a Trip Unit,suitable for use in types DS and DSL Low-Voltage ACpower circuit breakers and type SPB Systems Pow-R cir-cuit breakers and Series C R-Frame molded case circuitbreakers. The Digitrip RMS 810 Trip Unit provides fivebasic functions:

FunctionProtectionInformation

Monitors:CurrentPower and Energy

TestingCommunicationsRemote CLOSE / OPEN Control 5.8

Digitrip RMS 810 provides true RMS current sensing forproper correlation with thermal characteristics of conduc-tors and equipment. Interchangeable rating plugs areprovided to establish the continuous current rating ofeach circuit breaker. The Digitrip RMS 810 Trip Unit isdesigned for use in industrial circuit breaker environ-ments where the ambient temperatures can range from-20 C to +85 C and rarely exceed 70 to 75 C. If, however,temperatures in the neighborhood of the Trip Unit doexceed this range, the Trip Unit performance may bedegraded. In order to insure that the tripping function isnot compromised due to an over-temperature condition,the Digitrip RMS 810 microcomputer chip has a built-inover-temperature protection feature, factory set to trip thebreaker if the chip temperature exceeds 95 C. Ifover-temperature is the reason for the trip, the LongDelay Time LED will light “RED”, and the word “TEMP”will appear in the display window.The Trip Unit employs the Cutler-Hammer Inc. customdesigned integrated circuit SpRE+ chip, which includesa micro-computer to perform its numeric and logic func-tions. The principle of operation is described by the blockdiagram shown in Fig. 2.

In the Digitrip RMS 810 Trip Unit, all required sensing andtripping power to operate its protection function isderived from the current sensors in the circuit breaker.The secondary currents from these sensors provide thecorrect input information for the protection functions, aswell as tripping power, whenever the circuit breaker is

Section1.1.2 - 1.1.5 and 31.1.1 and 1.21.2.11.2.1.11.2.1.241.4 and 5 1.1.1 Operational Status and Protection TRIP

IndicatorsThe “Green” Light Emitting Diode (LED) in the lower rightcorner of the Trip Unit (Fig. 1) “blinks" once each secondto indicate the Trip Unit is operating normally.Note: If the LED is steadily “GREEN”, i.e. not blink-ing, the Trip Unit is not ready. Check the 120 VACcontrol power to the Power / Relay Module, if the LEDis not blinking. (See Section 1.4.)The LEDs, shown in Figs. 1 and 3.1 thru 3.6 on the faceof the Trip Unit, light “RED” to indicate the reason for anyautomatic trip operation. As indicated in Figs. 3.1 - 3.6,each LED is strategically located in the related segmentof the time-current curve depicted on the face of the TripUnit. The reason for trip is identified by the segment ofthe time-current curve where the LED is lighted “RED”,and shown by the “code” in the Display. Following anautomatic protection trip operation, the external controlpower to the Power/Relay Module (see Section 1.4) willmaintain the LED “RED” and will continue to send aTRIP signal to LOCKOUT the circuit breaker until the TripUnit is RESET. The Digitrip RMS 810 Trip Unit can beRESET in two ways:

• either press and release the “TRIP RESET” button(See Fig. 1 lower right corner just above the “UNITSTATUS” LED.),

or

• by the ‘Trip Reset” remote communications function.(See Section 5.9.)

F:T'N Effective May 1997



I.L. 29-888A

Green LED’sLight to IdentifyWhich Valueis PresentlyBeing Displayedin Window

Keyed Receptacle forAuxiliary Power ModuleConnector (See Sec 1.6)

- 4-Character Display WindowPress andrelease"Demand

. Press and release Reset"Trip UnitINCOM AddressCircuit BreakerLocation References

rtt* "STEP" PushbuttonPushbutton to to ResetDisplay Value of PeakNext Parameter Demand

Reading toZero

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SPB Rating Plug

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R-Frame Rating Plug

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Adjust Protection Settings forDesired Values with Rotary Switches

Digitrip RMS 810 Trip Unit Type LSIG with Rating PlugFig. 1

In the event that control power is lost, the back-up batteryin the Rating Plug (see Section 1.3 and Figs. 1 and 4)continues to supply power to the LEDs. To check the sta-tus of the battery, see Section 4.5.

power derived through current sensors integrallymounted in the circuit breaker.

The Digitrip RMS 810 Trip Unit is available in six differenttypes. Each Trip Unit may be equipped with a maximumof five phase and two ground (time-current) settings (seeSection 3) to meet specific application requirements. Theprotection available for each type is summarized inTable 1, and illustrated in Figures 3.1 through 3.6:

Note: The Digitrip RMS 810 performs all of its protec-tion functions regardless of the status of the battery.The battery serves only to maintain the indication ofthe reason for automatic trip.Press and release the “TRIP RESET” push-buttonshown in Fig. 1, to turn “Off” the LEDs following a tripoperation.

Type FigureProtection FunctionsLong Time / InstantaneousLong Time / Short TimeLong Time / Short Time / InstantaneousLong Time / Instantaneous / GroundLong Time / Short Time / GroundLong Time / Short Time / Instantaneous /

Ground

LI * 3.1LS * 3.2LSI * 3.3LIG 3.4LSG 3.5

1.1.2 General Over-Current Protection

The Digitrip RMS 810 Trip Unit is completely self-con-tained and when the circuit breaker is closed, requires noexternal control power to operate its protection sys-tems. It operates from current signal levels and control LSIG 3.6

F:T*NEffective Mav 1997



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Fig. 2 RMS Digitrip 810 Trip Unit - Block DiagramNOTE*: RMS Digitrip Type LI, LS and LSI Trip Unitscan be applied on 3-pole or 4-pole circuit breakers forprotection of the neutral circuit, IF the circuit breakeris wired and MARKED for NEUTRAL PROTECTION.Refer to the National Electric Code for appropriateapplication of 4-pole breakers.

manual operations)

If the 120 VAC control power remains available to thePower / Relay Module, this information can be viewed by

• INCOM® / IMPACC ". (See Section 5.6.) Therefore, usersmay want to use an uninterruptable power supply for thecontrol power to the power relay module.

NOTICE 1.1.3 Discriminator (High Initial Current Release)(For Types LS and LSG Trip Units only)

When the Digitrip RMS 810 Trip Unit is not equipped withan adjustable instantaneous protection setting, i.e. typesLS or LSG, a Discriminator circuit (or high initial currentrelease) is provided. The non-adjustable release ispre-set at eleven (11) times the installed rating plug cur-rent (ln), The Discriminator is enabled for approximatelyten (10) cycles following the initial current flow throughthe circuit breaker, provided the load current exceedsapproximately 10% of the circuit breaker frame (or cur-rent sensor) rating. Should the load current through thecircuit breaker drop to less than the 10% value, therelease will reset. The release, once reset will remainenabled until the load current passing through the circuitbreaker has exceeded the 10% value for 10 cycles. TheDiscriminator will trip the circuit breaker instantaneously,

the “OVERRIDE / DIS” LED will light “RED”, and the Dis-play will read “DISC”.

In the event the breaker is not intended to trip out on acircuit whose current could initially be higher than 1 1 x 1it is possible to make the Discriminator inactive.

AFTER EACH TRIP OPERATION (WHETHER DUE TOOVER-CURRENT PROTECTION OR REMOTE CON-TROL) THE AUTOMATIC LOCKOUT-AFTER-TRIPFEATURE OF THE DIGITRIP RMS 810 TRIP UNITMAINTAINS THE CIRCUIT BREAKER IN A“TRIP-FREE” CONDITION, PROVIDED 120 VAC CON-TROL POWER REMAINS AVAILABLE TO THEPOWER / RELAY MODULE. THE TRIP UNIT MUST BERESET. BEFORE THE CIRCUIT BREAKER CAN BECLOSED AGAIN. THE RESET CAN BE ACCOM-PLISHED EITHER LOCALLY BY PRESSING ANDRELEASING THE “ TRIP RESET’ PUSH BUTTON(SEE FIG. 1), OR REMOTELY BY THE IMPACC SYS-TEM. (SEE SECTION 5.9.)After an over-current trip operation, the following informa-tion is stored in the Trip Unit memory:

• the cause of trip• the values of currents thru the breaker at time of trip,• the time when the trip operation occurred• the total number of times the Trip Unit has tripped the

breaker electronically, (does not count shunt trip or

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F;T’N Effective May 1997



I.L. 29-888A

If a circuit breaker would close onto a high short-circuitcurrent when the Discriminator is inactive, type LS orLSG Trip Units will wait for the short-time delay settingbefore tripping. If the fault current exceeds the short-timewithstand current capability of the circuit breaker, theOverRIDe protection function will trip the breaker withoutdelay. (See Section 1.1.4.) Also, please see Section 1.1.5for other exceptions when Zone Interlocking is employed.

The Discriminator (high initial current release) can bemade inactive by turning the “OVERRIDE/” setting switch(nearest the bottom edge of the Trip Unit) from the “DIS”

position, to the “[blank]” position. (See Figs. 3.2 and 3.5)

Notes: This switch has eight (8) positions, and seven(7) of the positions show “D/S” in the window, ONLYONE position shows “[blank]”.When the “ OVERRIDES’ window shows “[blank]”, theonly fast-acting high short-circuit protection avail-able is the OVERRIDE (Fixed Instantaneous). (SeeSection 1.1.4.)

TABLE 1 DIGITRIP RMS 810 PROTECTION FUNCTIONSTrip Unit TYPE RMS DIGITRIP 810

S S S8 8 81 2 33 3 3L L L

S S

S S S8 8 84 5 63 3 3L L L

S SG G I

Refer toI.L. Section

NumberCatalog Number I I

IG

Suffix Number 81 82 83 84 85 86

Instruction Leaflet No. I.L. 29-888

Long-Time Delay ProtectionAdj. Current Setting (Pick-up)Adj. Time Delay SettingLong Time Memory

XXXXXXXXX

XXXXXXXXX

3.23.33.3

High Load AlarmALARM Indication at Trip UnitRemote ALARM Signal Contacts

XXXXXX

XXXXXX

Table 31.3

Short-Time Delay ProtectionAdj. Current Setting (Pick-up)Adj. Time Delay SettingOpt. "I squared T” Curve ShapesOpt. Zone Interlocking

X XX XX XX X

X XX XX XX X

3.43.53.5

1.1.5

Instantaneous ProtectionAdj. Current Setting (Pick -up)Discriminator (11 x) IN or OUTOverRIDe (> short time current rating)

X X X X 3.6 1.1.4 OVERRIDE (Fixed Instantaneous)

Each Digitrip RMS 810 Trip Unit has a Fixed Instanta-neous “Override” analog trip circuit automatically pre-setto a value no greater than the short-time withstand cur-

rent rating of the circuit breaker in which the Trip Unit isinstalled. Since the specific values vary for different cir-cuit breaker types and ratings, refer to time-currentcurves, listed in Section 6, for the values applicable toyour breaker. If breaker trips due to high instantaneouscurrent, the “OVERRIDE/” LED will light “RED”, and thedisplay will read “ORID”.

1.1.5 Zone Interlocking

Zone Selective Interlocking (or Zone Interlocking) is avail-able (see Fig. 2) for Digitrip RMS Trip Units having ShortDelay and/or Ground Fault protection. Zone SelectiveInterlocking provides the fastest possible tripping forfaults within the breaker’s zone of protection, and yet alsoprovides positive coordination among all breakers in thesystem (mains, ties, feeders and downstream breakers)to limit the outage to the affected part of the system only.When Zone Interlocking is enabled, a fault within thebreaker’s zone of protection will cause the Trip Unit to:

xx 1.1.31.1.41 1 1 1 1 1

Neutral Current Protection 1.1.1n n nGround Fault Protection

Adj. Current Setting (Pick-up)Adj. Time Delay SettingOpt. “I squared T" Curve ShapesOpt. Zone InterlockingGround Fault Time Memory

XXXXXXXXXXXXXXX

3.83.93.9

1.1.53.9

Trip Unit Over-Temp. TRIP XXX XXX 1.11.1.2Auto Lock-Out after TRIP c,r c,r c,r c.r c,r c.r

LED Indicators on TRIP Unit:XXXXXX

X X

XXXXXX

X X

Trip Unit Status (OK = Blinking)Long-Time Delay TRIPShort-Time Delay TRIP

1.1.21.1.21.1.2

INStantaneous TRIPOverRIDe / DISCriminator TRIPGround Fault TRIP

X X X X 1.1.21.1.21.1.2

X XXXX

Rating Plug Back-up Battery Status XXX X X X 4.5X X X X X XIntegral Test Provision 4

POWER / RELAY MODULEOutput Signal Contacts: X X X XXX 1.4

X X X XXXLong-Time Delay TRIP 1.4

Short-Circuit TRIP (includes any of:)• Short-Time Delay TRIP• INStantaneous TRIP• OverRIDe / DISCriminator TRIP

XXX XXX 1.4

XXX 1.4Ground Fault TRIPNeutral Current ALARMHigh LoaD ALARM

XXXXXX

1.4XXX 1.4

LEGEND: x = Function included for this trip unitc = 120 VAC Control Power required to maintain Lockoutn = Circuit Breaker must be equipped for Neutral Protectionr = Trip Unit can be re-set Remotely via INCOM / IMPACC* = “DISCriminator” is also called “Making Current Release”1 = n/a for Type DS Breakers“blank” = Function n/a for this trip unit

F:T*NEffective May 1997



I.L. 29-888A

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F:T*N Effective May 1997



11.29-888A

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Fig. 3.6 Digitrip RMS 810 Type LSIGFig. 3.5 Digitrip RMS 810 Type LSG

• Trip the affected breaker instantaneously, and

• Send a signal to upstream RMS Digitrip Trip Units torestrain from tripping immediately. The restraining sig-nal causes the upstream breakers to follow their setcoordination times, so that only the minimum service isdisrupted, while the fault is cleared in the shortest timepossible.

This signal requires only a single pair of wires from theoutput terminals of the downstream breaker’s Trip Unit, tothe input terminals of the upstream breaker’s Trip Unit.For specific instructions see the applicable connectiondiagrams for your breaker listed in Section 6.

Note: If a breaker (M) receives a Zone Interlockingsignal from another breaker (F) that is tripping, butthe fault current level is less than the setting forbreaker (M), the presence of the Zone Interlockingsignal from the other breaker (F) can not causebreaker (M) to trip.

CAUTION

IF ZONE INTERLOCKING IS NOT TO BE USED (I.E.STANDARD TIME-DELAY COORDINATION ONLY ISINTENDED), THE ZONE INTERLOCKING TERMINALSMUST BE CONNECTED WITH JUMPER WIRES, ASSPECIFIED ON THE CONNECTION DIAGRAMS FORYOUR BREAKER (SEE SECTION 6), SO THE TIME-

DELAY SETTINGS WILL PROVIDE THE INTENDEDCOORDINATION.For examples of how Zone Selective Interlocking may beused, See Appendix A.

1.2 Four Character Information Display Window

The four-digit alpha-numeric display window, illustrated inFigs. 1 and 2, serves two basic purposes: instrumenta-tion and mode of trip and trouble indication. The informa-

tion displayed in the window is listed in Tables 2 and 3.

1.2.1 Values Displayed During Normal Service

The alpha-numeric display window provides current,power or energy values under normal service conditionsand coded messages after an alarm condition or after an

F:T'NEffective May 1997



I.L. 29-888A

over-current trip operation. The seven Green LEDs belowthe display window indicate which value of current, poweror energy is being displayed. The value in the display win-dow indicates the present value of the parameter whoseLED is lighted “Green”. In Fig. 1, the first four “Green”LEDs identify which current (kA) value is being displayed,i.e. phase A current (lA), phase B current (lB), phase Ccurrent (lc), ground current (lG), or current in the fourthpole (neutral) (lD). The next three “Green” LEDs identifywhich Demand value is being displayed, i.e. Peak PowerDemand (MW), Present Power Demand (MW) or EnergyDemand (MWh). Press and release the (Black) “STEP”push button to view the value of the next parameter.

TABLE 2 DIGITRIP RMS 810 INFORMATION FUNCTIONS

Trip Unit TYPE RMS DIGITRIP 810

S S S8 8 81 2 33 3 3L L L

S S S8 8 84 5 63 3 3L L LI S SG G I

Refer toI.L. Section

NumberCatalog Number

S SI

G

Suffix Number 81 82 83 84 85 86

Instruction Leaflet No. I.L. 29-888

4 - Character LED Display XXX XXX 1.2

Current Values: 1.2.1.1

Phase A Current [la] (kA)Phase B Current [ lb] (kA)Phase C Current [lc] (kA)

X X XX X XXXX

XXXXXXXXX

I

1.2.1.1 Instrumentation - Current ValuesDuring the normal service conditions, with the circuitbreaker closed, the Digitrip 810 serves as an ammeter,displaying the individual phase currents (lA, lB, lc) andground current (lG) or the fourth pole (neutral) current(lD), provided the circuit breaker is set up for ground orfourth pole protection. Current values are displayed in kA.The value displayed is current in the pole (or ground) indi-cated by the “Green” LED that is turned “On”. Press andrelease the (Black) “STEP” push-button to view the val-ues of current in the other phases. (See Fig. 1.) Therange, accuracy and wave shape parameters for currentvalues displayed are:

RANGE: 5% to 100% of Frame Rating for Series C®

R-Frame or Type SPB circuit breakers,5% to 100% of [Current] Sensor Rating forType DS circuit breakers.

± 2% of Frame Rating for Series C®

R-Frame or Type SPB circuit breakers,± 2% of [Current] Sensor Rating forType DS circuit breakers.

WAVE SHAPE: Sinusoidal, ref. IEC 947-2 Appendix F(Harmonic content included for True RMS reading)

1.2.1.2 Instrumentation - Power and Energy Values

The Digitrip RMS 810 Trip Unit displays power andenergy values. By using the circuit breaker current sen-

sors and an integrally mounted Potential TransformerModule shown in Fig. 6, true power and energy valuesare computed and displayed in the four-digit display win-

dow on the face of the Trip Unit.

Ground Current [Ig] (kA)Neutral Current [Id] (kA)

XXX1.2 .1.1n n n

Power and Energy Values: 1.2 .1.2

Peak Power Demand (MW)Present Power Demand (MW)

Reverse Power Flow

XXXXXXXXX

XXXXXXXXX

Energy Consumption (MWh)Reverse Energy Consumption

XXXXXX

XXXXXX 1.2 .1.2

TABLE 3Local Messages:XDISC = Discriminator Trip

EXTT = EXTernal TripGNDT = GrouND Trip

XXXXXXX

XXX

HILD = High LoaD AlarmINST = INStantaneous TripLDPU = Long-Time Delay Pick-Up

XXXX XXXX

XXXIX X

XXX i

XXXXXX1 1 1

X X XX X X1 1 1

LDT = Long-Time Delay TripNPOW = Negative POWer flowORID - OverRIDe Trip

XXXXXX

X X

ORNG = OverRaNGe TripPLUG = Rating PLUG ProblemSDT = Short-Time Delay Trip

XXXXXX

X X I

XXXXXX

XXXXXX

TEMP = OverTEMPerature TripTEST = TEST ready to beginor TABLE 3

LEGEND: X = Function included for this trip unitn = Circuit Breaker must be equipped for Neutral Protection1 = n/a for Type DS BreakersACCURACY:

The power and energy parameter values displayed in thewindow on the face of the Trip Unit include:

• Peak Demand in MW (Megawatts)• Present Demand in MW (Megawatts)• Energy (Consumed) in MWh (Megawatt-hours)

Three “Green” LEDs as shown in Fig. 1 are provided toindicate which power/energy value is displayed. Thesame “STEP” push-button pressed and released to viewthe different values of current is also pressed andreleased to view the power and energy values.

The Peak Demand parameter is based on a samplingwindow of fifteen (15) minutes. The Peak Demand is theaverage power used during this period and the displayed

or peak value since the (Black)“Demand Reset”, push-button was last pressed andreleased. The demand window is not a “sliding window”.

or

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It is more like a “jumping window”. When the Trip Unit isfirst energized, there is a delay before the first non-zerovalue is displayed. To reset the peak demand valueshown in the display window back to zero, press andrelease the (Black) “Demand Reset” push-button, shownjust above the “STEP” push-button in Fig. 1. Note: Thepeak demand function requires that 120 VAC controlpower be supplied to the Power / Relay Module.

The Present Demand is a one second average powervalue. To view the “Present Demand” value in the displaywindow, press and release the “STEP” push-button sev-eral times until the LED next to “Present MW” is lighted.

will not be displayed continuously. Instead, the powervalue in the display window will alternate with the codedmessage “NPOW”. This message, alternating with thevalue, indicates power flowing out of the top of the circuitbreaker. This condition will occur when a Main circuitbreaker is “reverse fed” and can frequently occur for Tiecircuit breakers. The “NPOW” message can be defeatedby inserting an appropriate “jumper”. (See wiring diagramfor your type of circuit breaker listed in Section 6.)

1.2.2 Messages Displayed After ALARM or TRIPAfter an ALARM condition or circuit breaker TRIP opera-tion occurs, one of the coded messages listed in Table 3will appear in the display window, provided control poweris still available for the Power/Relay Module (See Section1.4). When an ALARM condition occurs, the operator hastime to take action, such as reducing the load, to correctthe situation. The message will remain in the display win-dow until the “STEP” push-button (see Fig. 1) is pressedand released, then the message will disappear and thevalues of currents (kA) at the present time can be viewedin the window.Note: Press and release the “STEP” push button sev-eral times to be sure you see the values of all the cur-rents. The first value you see may not be the greatest.

Following a circuit breaker TRIP operation, the displaywindow indicates the reason for trip, using coded mes-sages such as, INST (Instantaneous Trip), LDT (LongDelay Trip), etc. As with the ALARM function, press andrelease the “STEP” push button to clear the reason fortrip message and the display window will then show thevalues of current at the time of trip. (See notes (1), (2)and (3) under Table 3.) The values remain in memory,and the “red” reason for Trip LED (See Figs. 1 and 3.1 -3.6) remains lighted, until the Trip Unit is reset by press-ing and releasing the “TRIP RESET” push-button in thelower right corner of the Trip Unit. (See Fig. 1.)Note: Be sure to RECORD all Values of interest, notewhich “RED” LEDs are lighted, and correct the causeof the overload or fault BEFORE YOU RESET the TripUnit.The LOCKOUT after trip feature requires the Trip Unit tobe reset before the breaker can be closed again.

For examples of how to interpret the display after anoverload and after a short-circuit, see Appendix B.

The range, assumptions and accuracy parameters forpeak and present power demand values displayed are:

RANGE:ASSUMES:

0 to 9.999 MW5% < Current < 175% of the Plug Rating ln

SAMPLING WINDOW: 15 min. for Peak Demand, 1 sec.for Present DemandACCURACY: ± 4% of (Frame Rating x 600 V) for Series

C® R-Frame or Type SPB circuit breakers,± 4% of (Current Sensor Rating x 600V) forType DS circuit breakers.

or

The Energy parameter is the summation of the averagepower over time and it is expressed in megawatt-hours(MWh). The value is updated every second. The valuecannot be reset locally, but after the maximum value isreached, the display automatically rolls over to zero.

The range and accuracy parameters for energy demandvalues displayed are:

RANGE: Oto 999.9 MWh if ln < 1000 AOto 9999 MWh if ln > 1000 A5% < Current < 175% of the Plug Rating ln

ACCURACY: ± 5% of (Frame Rating x 600 V x time) forSeries C® R-Frame or Type SPB circuitbreakers,± 5% of (Current Sensor Rating x 600V xtime) for Type DS circuit breakers.

The energy value is stored in the Trip Unit memory. Aslong as the 120 VAC control power is maintained to thePower / Relay Module, it can be viewed. If the 120 VACcontrol power is lost and then is restored, the Energyvalue is restored too.The Digitrip RMS 810 Trip Unit presumes that power isflowing into the “top” and out of the bottom of the circuitbreaker (positive flow of power). If the power flows in theopposite direction, i.e., bottom to top, the value of power

ASSUMES:

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TABLE 3 - DIGITRIP RMS 810 TRIP UNIT MESSAGE CODES AND THEIR MEANINGS

MESSAGE MEANING COMMENT SEC.

DISC DISCriminator Trip!(High initial Current Release)

Breaker tripped instantaneously because phase currentexceeded 11 x rating plug current ln Value

1.1.3

EXTT EXTernal Trip Breaker tripped due to external communications controlsignal- for example from IMPACC

5.8

GNDT GrouND-fault JripI Breaker tripped because ground current exceeded GroundFault protection settings

Phase current has exceeded 85% of Long-Time CurrentSetting for more than 40 seconds

3.8. 3.9

HILD High LoaD AlarmALARM: NearingOverload Condition

App'x BCasel

INST JNStantaneous Trip-M Breaker tripped instantaneously because phase currentexceeded Instantaneous protection setting

Phase current has exceeded Long-Time current setting.Trip unit is timing to trip breaker.

3.6

LDPU Long-Time Delay Pick-lipALARM: OverloadCondition in Progress

Long-Time Delay Trip 4(Overload Trip)

3.2

LDT Breaker tripped because phase current exceeded Long-Time protection settings

Net power is flowing into “load" side (bottom) of breaker,

and out from “line" side (top) of the breaker.

Breaker tripped instantaneously because phase currentexceeded short -time rating of circuit breaker

Breaker tripped instantaneously because phase current(or ground current) exceeded 28 x rating plug currentln value

3.2. 3 3

Negative PQWer flowNPOW 1 2.1.2

OverRIDe TripORID 1.1. 4

Qver RaNGe Trip,Li(Current too high tomeasure.)

ORNG 1.2.2

Rating PLUG ProblemPLUG Rating Plug is missing, damaged, or not well connected.

If breaker is closed, it will trip, and the instantaneous/override LED will light. If breaker is open, it will not close.

1.3

Protection functions still operate, but may be up to 12%out-of-tolerance. Replace trip unit at first opportunity.

ROM ERROR... Nonfatal memory error 1.2.2.1

Short-Time Delay Trip4 Breaker tripped because phase current exceeded Short-Time Delay protection settings

SDT 3.4. 3.5

Breaker tripped because ambient temperature ofSURE+ chip exceeded 95 degrees C

OverTEMPerature Trip 1.1TEMP

Trip Unit test will begin as soon as you release the pushto test button and “TEST' message will disappear. Thebreaker will trip, and the cause of trip is displayed.

Trip Unit test will begin as soon as you release push totest button, and the display shows the elapsed time of test .

TEST and trip breaker isready to begin

4.0TEST

4.0(blank ] Test (without trippingbreaker) is ready to begin

orTrip unit not “ON" Control power is out .

NOTES:• In the case of a high-level fault condition where fast tripping is desirable, the Trip Unit will operate before a complete RMS current value can be calculated. For this reason, the displayed

value may be less than the actual RMS fault current .d In the case of a very high fault current (greater than 28 x ln). the message “ORNG" (indicating over range) appears because the Trip Unit cannot determine the actual value of the fault cur -

rent.j OverRIDe (Fixed Instantaneous) Trip is for type LS and LSG Trip Units (no Instantaneous element), on circuit breakers whose Short-Circuit current interrupting capability exceeds their

Short -Time Current withstand capability. (See Section 1.1.4)4 The values of the currents displayed after a TRIP event, are the values at the time the TRIP operation was initiated. Although the magnitude of a fault current, for example, can continue to

increase after the TRIP operation is initiated, those values of current occuring after the TRIP operation is initiated, are not displayed.

ues of current, energy, and power displayed, and theycould be even greater than 12%. The scrolling messagewill not remain in the window constantly, and you canread present values of parameters at any time by press-ing and releasing the “STEP” push-button, as you nor-mally would. The message will automatically reappearevery few minutes, and further, every time you press andrelease the “TRIP RESET” push button, the message willalso be displayed, to remind you to replace the Trip Unitat your earliest opportunity.

1.2.2.1 ROM Error...See I.L.If you see the message, “ROM Error...See I.L.”, scrollingacross the display window, it means that a non-fatal errorhas been detected somewhere in the Trip Unit’s memory.The condition is not serious, and the Trip Unit will stillfunction to protect the circuit, but the published Time-Cur-rent Curve tolerances may be exceeded in some casesby as much as 12%. It is not necessary to trip and lockoutthe breaker; however, the Trip Unit should be replaced atthe earliest opportunity. There may also be errors in val-

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1.3 Frame Rating, Sensor Rating (where applicable)and Rating Plugs

The Frame Rating of a circuit breaker is the maximumRMS current it can carry continuously. The maximumShort-Circuit Current Ratings of the circuit breaker areusually related to the Frame Rating as well.

It is often times desirable to be able to choose a currentvalue (ln), less than the full frame rating, to be the basisfor the coordination of the circuit breaker’s protectionfunctions, without affecting its short-circuit current capa-bility. For the Digitrip RMS 810 Trip Unit the maximumcontinuous current (ln) is set by the Rating Plug (and/orCurrent Sensors, where applicable)—see Section 6 forspecific instructions for your circuit breaker type.

The (Current) Sensor Rating (where applicable) is themaximum RMS current the circuit breaker can carry withthe specified current sensors installed. The Sensor Rat-ing can be the same or less than the Frame Rating, butnot greater.

The Rating Plug (see Fig. 4) fits into a special cavity tocomplete the Trip Unit (see Fig. 1).

After installing the Rating Plug, press and release the“TRIP RESET” push-button. The purpose of the ratingplug is to set the value of ln, the basis for the Trip Unitprotection function current settings. (See Section 3 fordetails.) Each circuit breaker frame rating represents themaximum current it can carry continuously. However forproper coordination of over-current protection, it is oftendesirable to choose different levels of ln for different cir-cuit breakers of the same frame rating. An assortment ofrating plugs with different ln values is available for eachbreaker frame rating (See circuit breaker instruction leaf -

let supplements listed in Section 6) to give the user flexi-bility to change the value of ln without having to changethe primary current sensors on the breaker. By changingthe rating plug, the user can easily change the range ofcurrent protection settings without having to remove thecircuit breaker from its enclosure.For example, if one expects a circuit to carry 600 A ini-tially, but then increase to 1400 A in the future, one couldinitially install 1600 A cables and a 1600 A breaker framewith the Trip Unit rating plug whose ln = 800 A. Then lateron when the additional load is ready to come on line, therating plug could be exchanged for one with ln = 1600A,

without having to remove the breaker from its enclosure.The available settings would give the following choices:

Long Delay Settingt r = ln x: .5 .6 .7 .8 .85 .9 .95 1.0

Plug ln = 800ALDPU l r = : 400 480 560 640 680 720 760 800A

Plug ln = 1600 ALDPU l r = . 800 960 1120 1280 1360 1440 1520 1600A

^ CAUTION

BEFORE YOU FIT THE RATING PLUG INTO THE TRIPUNIT, BE SURE TO CHECK THAT THE BREAKERTYPE AND FRAME RATING (OR SENSOR RATING IFAPPLICABLE), MATCH THOSE PRINTED ON THERATING PLUG COVER. INSTALLING A RATING PLUGTHAT DOES NOT MATCH THE BREAKER TYPE ANDFRAME RATING (OR SENSOR RATING, IF APPLICA-BLE), CAN PRODUCE SERIOUS MISCOORDINATIONAND/OR FAILURE OF THE PROTECTION SYSTEM.

Fig. 4 Rating Plug

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Note: Rating plugs from Digitrip models 500 / 600 /700 / 800 CANNOT be used with model 810 Trip Units.The connection pins are located in different posi-tions, so one cannot accidentally use the incorrecttype of plug.Rating Plugs for the Digitrip RMS 810 Trip Units aremarked for, and may be applied on both 50 and 60 Hzsystems.

Rating plugs have two current ratings listed on their cov-ers (See Fig. 4).

• the “Must Use With Frame Rated” current value (or“Sensor Rated”, if applicable),

and

• (Rated l)= ” current value.

This latter value (ln) is the basis for the Trip Unit currentsettings:

• The Instantaneous and Ground Current Settings (ifapplicable) are multiples of (ln) (See Sections 3.6and 3.8.)

• The Long Delay Current Setting, lr is a multiple of (ln).Long Delay Current Setting = lr = LD x (ln).(See Section 3.2.)

• The Short Delay Current Setting (if provided) is a multi-ple of lr which in turn is a multiple of (ln).Short Delay Current Setting = SD x lr = SD x LD x (ln)(See Section 3.4.)

If the rating plug is missing or not well connected, thenthe display will show “PLUG”, and the instantaneous /override LED will be lighted. If the circuit breaker isclosed, it will trip; if it is open, it will remain trip-free, aslong as 120 VAC control power is available to the Power /Relay Module. Even if control power is lost, and the ratingplug condition is not corrected, as soon as the three-phase current through the circuit breaker reaches 20%(40% if single-phase current) of the frame/current sensorrating, the Trip Unit will trip the breaker again.

As indicated in Figs. 2 and 4, a back-up battery is pro-vided to maintain the mode of trip LED indication in theDigitrip RMS 810 Trip Unit when external control power tothe Power/Relay module is not available. The back-upbattery is located in the rating plug along with a batterycheck push-button and a green battery check LED. Thebattery in the rating plug is “OK” if the LED lights “Green”when the “battery check” button next to it is pushed. (SeeSection 4.5.)

Fig. 5

Note: The battery is used only to maintain the causeof TRIP LED indication. It has no part in the protec-tion function of the Trip Unit, and, it does not light thedisplay window.

Power Relay Module

1.4 Power / Relay ModuleThe Power / Relay Module (PRM) (see Fig. 5) is separatefrom the RMS Digitrip 810 Trip Unit itself, and is notrequired for the Trip Unit to perform its protection func-tions. The Power / Relay Module performs two functions.First, it uses available external control power (120V 50/60Hz ac, 6 VA) to operate the display window, communica-tions circuitry and reason for trip LED indicators. Second,it has internal signal relays for use by other devices in thecontrol scheme, at locations remote from the circuitbreaker. The internal relays operate when the Trip Unitdetects the following conditions:

• Short-Circuit Trip Alarm• High Load Alarm• Long Delay Trip Alarm• Ground Fault Trip Alarm (types LIG, LSG, LSIG) or

Neutral Over-Current Alarm (Types LI, LS LSI)

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• In addition, the Power / Relay Module also contains theINCOM® COMMUNICATIONS CLOSE contact, whichoperates the circuit breaker’s closing release, on com-mand from INCOM / IMPACC®. (See Section 5.8.)

Each relay contact is rated for 120V, 50/60 Hz ac, 1.0Ampere. The High Load Alarm contact operates after theload current has exceeded 85% of the long delay currentsetting, lr , for 40 seconds. The 40-second delay allowsthe system to “ride through” momentary high load condi-tions and avoid nuisance alarms.

The Long Delay Trip Alarm contact operates after thebreaker TRIPS due to over-load conditions whichexceeded the Long Delay Trip settings.

For Type LSG, LIG and LSIG Trip Units, the Ground FaultTrip Alarm contact operates after the breaker TRIPS dueto conditions which exceed the Ground Fault protectionsettings. For Type LS, LI, and LSI Trip Units, the NeutralCurrent Alarm contact operates when the neutral currentexceeds the Long Delay Current protection setting, lr.The Short-Circuit Trip Alarm contact operates after thebreaker TRIPS due to an INSTantaneous trip, Short-Delay Trip, Discriminator trip, a Fixed InstantaneousOverRIDe trip, or a Rating PLUG trip as applicable.

Even without available external control power, once theload current through the circuit breaker exceeds approxi-mately 20% (40% if single phase) of the frame/currentsensor rating, the green LED will flash “On and Off” onceeach second, to indicate the Trip Unit is energized andoperating properly, and all protection functions are func-tioning. However, the display window will remain dark.

Note: If 120 VAC control power is lost to thePower/Relay Module, the LOCKOUT after trip willreset and the breaker can be closed again. Howeverthe cause of trip bit will remain set in the Digitrip’snon volatile memory and a cause of trip message willreappear when control power returns. A completeclearing of cause of trip history may be accom-

plished by depressing the reset push-button whenthe Digitrip unit is powered up. (Indicated by the UnitStatus flashing)

1.5 Potential Transformer ModuleThe Potential Transformer Module (PTM) (see Fig. 6) isalso separate from the RMS 810 Trip Unit, and is notrequired for the Trip Unit to perform its protection func-tions. The Potential Transformer Module providesthree-phase primary voltage information necessary forthe Trip Unit to calculate true power and energy values.(See Fig. 2.)The Potential Transformer Module primary terminals aresuitable for all system voltage ratings up through 600V.,50/60 Hz, and are connected to the primary phase con-ductors inside the breaker, providing stepped down volt -age signals to input terminals VA, VB, Vc and VN on therear of the Digitrip 810 Trip Unit housing.

The primary voltage connection to the Potential Trans-former Module is made through a disconnecting plug(see Figs. 2) that can be located either on the module (asshown in Fig. 6) or on the side of the circuit breaker, asindicated in the applicable circuit breaker instruction leaf -

let. (See Section 6.)

CAUTION

APPLYING VOLTAGES GREATER THEN 600 VAC TOTHE PRIMARY CONDUCTORS OF THE CIRCUITBREAKER, SUCH AS FOR DIELECTRIC WITHSTANDTESTING, CAN POSSIBLY DAMAGE THE PTM ORTHE TRIP UNIT. FOLLOW THE INSTRUCTIONSGIVEN IN SECTION 4.1 FOR REMOVING THE VOLT-AGE DISCONNECT PLUG TO ISOLATE THE TRIPPTM

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UNIT BEFORE PERFORMING DIELECTRIC TESTS ONTHE CIRCUIT BREAKER. SEE ALSO THE SPECIFICDIELECTRIC TEST PROCEDURES IN THE APPLICA-BLE CIRCUIT BREAKER INSTRUCTION LEAFLET,LISTED IN SECTION 6.

types DS, DSL, SPB and Series C® R-Frame circuitbreakers.

3.0 PROTECTION SETTINGS

3.1 GeneralPrior to placing any circuit breaker in operation, each TripUnit protection setting must be set to the values specifiedby the engineer responsible for the installation. The num-ber of settings that must be made is determined by theprotection supplied as illustrated in Figs. 8.1 through 8.7.Each setting is made with a rotary switch, using a smallscrewdriver. The selected setting for each adjustmentappears in its respective rectangular viewing window asillustrated in Fig. 1.The installed rating plug establishes the maximum con-

tinuous current rating (ln), up to, but not exceeding theFrame Rating of the circuit breaker. Instantaneous andground current settings are defined in multiples of (ln).

To illustrate the effect of each protection curve setting,simulated Time-Current curves are pictured on the faceof the Trip Unit. The rotary switch used to make each set-ting is located nearest that portion of the simulatedTime-Current curve it controls. Should an automatic“TRIP” occur (as a result of the current exceeding thepre-selected value), the LED in the appropriate segmentof the simulated Time-Current curve will light “RED”, indi-cating the reason for the ‘TRIP”.

The available settings, along with the illustrated effect ofchanging the settings are given in Figs. 8.1 through 8.7.

1.6 Auxiliary Power ModuleThe Auxiliary Power Module or APM (Cat. No.PRTAAPM), illustrated in Fig. 7, is an encapsulatedpower supply that requires a 120 VAC input at either 50or 60 Hz. It provides an output of 32 Vdc (nominal 40 Vdcopen circuit) which is used during testing of the DigitripRMS 810 Trip Unit, whenever 120 VAC control power isnot available to the Power/Relay Module. (See Section1.4.) When a drawout circuit breaker is equipped with aDigitrip RMS 810 Trip Unit, it can be conveniently set andtested while the circuit breaker is either out of its cell or inits cell in the “Test”, “Disconnect” or “Withdrawn” posi-tions by using the Auxiliary Power Module.

The Auxiliary Power Module is equipped with a uniqueplug-in connector suitable only for plugging into the keyedreceptacle in the upper right corner of a Digitrip RMS TripUnit as shown in Fig. 1. This avoids the inadvertent useof an incorrect type power module.

The APM is suitable for use with older Digitrip RMS 500,600, 700, 800, as well as newer RMS 510, 610 and 810Models.

2.0 UL LISTED DEVICESDigitrip RMS 810 Trip Units are “Listed” by the Underwrit-ers Laboratories, Inc.® under UL File E7819, for use in

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automatically reduces the time to trip, to allow for thefact that the load circuit temperature is alreadyhigher than normal, due to the prior overload condi-tion. Repeated overload conditions can cause theLTM to trip the breaker after a time delay less thanthe “Long Delay Time Setting”. When the load cur-rent returns to normal, the LTM begins to reset; andafter about 10 minutes it has reset fully, so that nextLong Delay trip time will again be the “Setting” value.To reset the LTM quickly, see Section 4.4, item 3.

birLong DelaySetting Ir

Available Settings

8 .5, .6, .7, .8,.85, .9, .95, 1mx In = Ir

0 In Multiples ofRating PlugAmperes (ln)

Fig. 8.1 Long Delay Current Settings Available Settings

2, 2.5, 3, 4,5, 6, Si, S2

3.2 Long Delay Current SettingThere are eight (8) available Long Delay “Pick-up” Cur-rent Settings, as illustrated in Fig. 8.1. Each setting,called “/r”, is expressed as a multiple (ranging from.5 to 1) of the rating plug current (ln).

Note: is also the basis for the Short-Delay Cur-rent Setting. (See Section 3.4.)

Short DelaySetting

In Multiples ofLong Delay Setting*\e < /r)

1

$1 and S2 Values are Specified on Rating Plug

Fig. 8.3 Short Delay Current Settings

3.4 Short Delay Current SettingThere are eight (8) available Short Delay “Pick-up" Cur-rent Settings, as illustrated in Fig. 8.3. Six settings are inthe range from 2 to 6 times lr and the other two settingsare “S1” or “S2” times lr . (REMEMBER: lr is the LongDelay Current Setting). The values that “S1” and “S2”have depend upon the type of circuit breaker, and arespecified both on the rating plug label (see Fig. 4) and onthe applicable (LS) Time-Current Curve referenced inSection 6.

Long Delay .»«

TimeSec-

at 6 x lr

© Available Settingsil 2, 4, 7, 10,

12, 15, 20. 24

Seconds at 6 TimesLong Delay Setting

1 i/r)

-6 x 1, 3.5 Short Delay Time Setting

As illustrated in Fig. 8.4, there are two different ShortDelay curve shapes, i.e., fixed time (flat) and l2tresponse. The shape selected depends on the type ofselective coordination chosen. The l2t response will pro-

vide a longer time delay in the low-end of the short delaycurrent range than will the flat response.

Five flat (.1, .2, .3, .4, .5 sec.) and three l2t (.1*, .3*, .5*

sec.) response time delay settings are available. The l2tresponse settings are identified by the suffix asterisk (’)

that appears in the setting viewing window. The l2tresponse is applicable to currents less than eight (8)times lr , the Long Delay Setting. For currents greater

than 8 times /r, the l2t response reverts to the flatresponse.

Fig. 8.2 Long Delay Time Settings

3.3 Long Delay Time SettingThere are eight (8) available Long Delay Time Settings,as illustrated in Fig. 8.2, ranging from 2 to 24 seconds.These settings are the total clearing times in seconds,when the current value equals six (6) times lr. The (LS)Time-Current Curve applicable for your circuit breakergives complete details. (See Section 6.)Note: In addition to the standard Long Delay Protec-tion Element, the Digitrip RMS 810 Trip Unit also hasa Long Time Memory (LTM) function, which serves toprotect load circuits from the effects of repeatedoverload conditions. If a breaker is re-closed soonafter a Long Delay Trip, and the current againexceeds the Long Delay Current Setting, lr the LTM

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ues that “M1” and “M2” have depend upon the type of cir-cuit breaker, and are specified both on the rating pluglabel (see Fig. 4), and on the applicable (I) Time-CurrentCurve referenced in Section 6.

* %

1%

%%

% %% V Short Delay

TimeU| Sec.

% 3.7 NO Instantaneous Current SettingFor types LS and LSG Trip Units, please see Sections1.1.3 Discriminator (High initial Current Release) and1.1.4 OVERRIDE (Fixed Instantaneous), for availablefast-acting high short-circuit protection.

- 0

Available Settings

3.8 Ground Fault Current SettingThe eight (8) Ground Fault “Pick-Up” Current Settings arelabeled with the code letters "A” through “K” (except thereare no “G” or “I” settings), as illustrated in Fig. 8.6. In gen-eral, the specific current settings range from 0.25 to 1.0times (ln), the rating plug value, but cannot exceed1200 A. The specific Ground Current Settings for eachletter are listed in Table 4 and on the (G) Time-CurrentCurve applicable for the circuit breaker (see Section 6.)

1, .2, .3, .4, .5 ,

Seconds withFlat Response

% r ip pif

iii

i

I.-

^ l2t ShapeReturns to FlatResponse at Currents

-j- Higher than 8 x /f

.1*, .3 *. .5*TABLE 4 - GROUND FAULT CURRENT SETTINGS

i r Seconds withI2t Shape GROUND FAULT CURRENT SETTINGS

(AMPERES)l9

In Viewing WindowIndicatesl2t Shape

A B C D E F H K

100 25 30 35 40 50 60 75 1008 x /f 60 80 100 120 150 200200 50 70

100250 63 75 88 125 150 188 250'O'

c 150300 75 90 105 120 180 225 300w 400 100 120 140 160 200 240 300 400LU

Fig. 8.4 Short Delay Time Settings £ 600

^ 630< 800

° 1000

150 180 210 240 300 360 450 600315 473158 189 221 252 378 630

240 280 320 400 480 600 800200300 350 400 500 600 750 1000250Z>

Available Settings 360 420 480 600 720 900 1200Q. 1200<5 1250

300«t iihr 375 438 500 625 750 938 1200i 3122, 2.5, 3, 4,5, 6, M1, M2

tl 560 640 800 960 1200 12001600 400 480£JkIi

i K 2000 600 700 800 1000 1200 1200 1200500Setting Inst. , j0x l n | In Multiples of

Rating PlugAmperes (In)

Q1200 1200 1200 1200600 720 840 960LU 2400

1000 1200 1200 1200 12002500 625 750 87550 II 1200 1200 1200 1200 120003 3000/3150 750 900 1050i

1120 1200 1200 1200 1200 12003200 800 960M1 and M2 Values are Specified on Rating Plug 1200 1200 1200 1200 1200 1200 12004000 1000

1200 1200 12005000 1200 1200 1200 1200 1200

J Tolerances on settings are ±10% of values shown.2 Refer to Type DS, type SPB or Series C R-Frame supplemental instruction

leaflets given in Section 6 for list of available rating plugs for each type circuitbreaker.

Fig. 8.5 Instantaneous Current Settings

Note: See also Section 1.1.5, Zone Interlocking,above.

3.6 Instantaneous Current SettingThere are eight (8) available Instantaneous Current Set-tings, as illustrated in Fig. 8.5. Six settings are in therange from 2 to 6 times the rating plug value (ln), and theother two settings are “M1” and “M2” times (ln). The val-

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Available SettingsGnd-FaultSetting

® xlnA, B, C, D,E , F, H, K Gnd Fault

Time

\j\ Sec .G Specific ValuesGiven on CircuitBreaker Time-CurrentCurve and in Table 1 0O

Fig. 8.6 Ground Fault Current Settings

Note: For Testing Purposes Only: When using anexternal single phase current source to test low levelground fault current settings, it is advisable to usethe Auxiliary Power Module (APM) (See Section 1.6and Fig. 7).

Available Settings

.1, .2, .3, .4, .5

Seconds withFlat Response

]3.9 Ground Fault Time Delay SettingAs illustrated in Fig. 8.7, there are two different GroundFault curve shapes, i.e., fixed time (flat) and l2t response.The shape selected depends on the type of selectivecoordination chosen. The l2t response will provide alonger time delay in the low-end of the ground fault cur-rent range than will the flat response.Five flat (.1, .2, .3, .4, .5 sec.) and three l2t (.1*, .3*,.5* sec.) response time delay settings are available. Thel2t response settings are identified by the suffix asterisk(*) that appears in the setting viewing window. The l2tresponse is applicable to currents less than 0.625 x ln(The ln value is marked on the installed rating plug). For

currents greater than 0.625 x ln, the l2t response revertsto the flat response.

Note: See also Section 1.1.5 on Zone Interlocking.

Note: In addition to the standard Ground Fault pro-tection, the Digitrip RMS 810 Trip Unit also has aGround Time Memory (GTM) function, which servesto protect loads in the event of a sputtering arc toground. Without the GTM function, the Trip Unitwould normally reset each time the arc sputtered,and begin to time-out all over again, so that a sputter-ing fault may not have been detected. But with theGTM function, the Trip Unit “remembers” the sputter-ing ground current for up to five (5) times the GroundFault Time Setting. After that time, it does reset auto-matically. The GTM function does reset ratherquickly; on the 0.1 second setting, for example, it willreset in 0.5 second.

I 2t ShapeReturns to FlatResponses atApproximately0.625 ln,1# , .3* . .5*

Seconds Withl2t ShapeIn Viewing Window

Indicatesl2t Shape

** »»

Fig. 8.7 Ground Fault Time Delay Setting

4.0 TEST PROCEDURES

4.1 General

DANGER

DO NOT ATTEMPT TO INSTALL, TEST OR PERFORMMAINTENANCE ON EQUIPMENT WHILE IT IS ENER-GIZED. DEATH OR SEVERE PERSONAL INJURY CANRESULT FROM CONTACT WITH ENERGIZED EQUIP-MENT.DE-ENERGIZE THE CIRCUIT AND DISCONNECT THECIRCUIT BREAKER BEFORE PERFORMING MAINTE-NANCE OR TESTS.DO NOT ATTEMPT TO PERFORM DIELECTRIC (ORHIGH POT OR HIGH VOLTAGE) WITHSTAND TESTSON THE CIRCUIT BREAKER WHILE THE VOLTAGEDISCONNECT PLUG TO THE POTENTIAL TRANS-FORMER MODULE IS INSTALLED. (SEE FIG. 6 ANDINSTRUCTIONS FOR TESTING YOUR SPECIFIC CIR-CUIT BREAKER LISTED IN SECTION 6.) PTM ORTRIP UNIT DAMAGE OR FAILURE CAN RESULTFROM ENERGIZING PTM AT MORE THAN 600 VOLTS.

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I.L. 29-888A

VERIFY THAT NO VOLTAGE IS PRESENT ON THECIRCUIT BREAKER BEFORE REMOVING THE VOLT-AGE DISCONNECT PLUG. (SEE FIG. 6.)REMOVE THE VOLTAGE DISCONNECT PLUG TO ISO-LATE THE POTENTIAL TRANSFORMER MODULE(FIG. 6) BEFORE PERFORMING ANY VOLTAGETESTS ON THE CIRCUIT BREAKER. REINSTALL THEPLUG ONLY AFTER ALL VOLTAGE TESTS HAVEBEEN COMPLETED AND CONFIRM THAT NO VOLT-AGE IS PRESENT ON THE CIRCUIT BREAKER.REINSTALL THE VOLTAGE DISCONNECT PLUG TORECONNECT THE POTENTIAL TRANSFORMERMODULE BEFORE PLACING THE BREAKER BACKINTO SERVICE. REFER TO THE APPLICABLE CIR-CUIT BREAKER INSTRUCTION LEAFLET SUPPLE-MENT (LISTED IN SECTION 6) FOR COMPLETEINSTRUCTIONS.

altered during or as a part of any routine testsequence.

Available "Test Amps" SettingsBreaker Tripsat 6T and GFT © -6T" = Phase Current Test at

6x1n and TRIPS breaker;M, 2, 3,8 or 10* x in = PhaseCurrent Test - NO breakerTRIP;

"GFT" = Ground Current Testand TRIPS breaker;

"GF" = Ground Current Test •

NO breaker TRIP.See Section 4.4.2 for inser-vice test trip limitations.

Test Ampsg<Dxln

0Test d OTrip ~ OReset ® u

® Push, then releasebutton to reset Trip Unit.Required following all automatictrip and test operations.

® Push,then releasebutton to test. Test operationbegins with release ofpushbutton.

Unit OStatus

Fig. 9 Integral Test Panel (Lower Right Corner of TripUnit)

CAUTION4.3 Testing ProvisionsAs illustrated in Figs. 1 and 9, an integral test panel isprovided to test the Digitrip RMS 810 Trip Unit.While the Integral Test Panel does enable one to checkthe performance of many parts of the trip system, includ-

TESTING A CIRCUIT BREAKER UNDER “TRIP CON-DITIONS” WHILE IT IS IN SERVICE AND CARRYINGLOAD CURRENT, WHETHER DONE BY LOCALLY ORBY REMOTE MEANS, IS NOT RECOMMENDED.ANY TRIPPING OPERATION WILL CAUSE DISRUP-TION OF SERVICE AND POSSIBLE PERSONALINJURY RESULTING FROM UNNECESSARY SWITCH-ING OF CONNECTED EQUIPMENT.TESTING OF A CIRCUIT BREAKER THAT RESULTSIN THE TRIPPING OF THE CIRCUIT BREAKERSHOULD BE DONE ONLY WITH THE CIRCUITBREAKER IN THE “TEST” OR “DISCONNECTED”CELL POSITIONS OR WHILE THE CIRCUITBREAKER IS ON A TEST BENCH.

ing:

• Microprocessor Functions• Trip Release• Trip Settings• LEDs• Display Panel• Zone Interlocking Function• Power Relay Module• Rating Plug• Communications Functionsthere are some parts it cannot check, for example:

• Current Sensors• Auxiliary Current Transformers• Bridge Circuits• Calibration Resistors• Potential Transformer Module• Analog Override Circuit

and the functions of these elements are best verified byprimary current injection testing.As indicated in Fig. 9, note 1, six different ‘Test Amps”settings (1, 2, 3, 6T, 8 and 10 x ln) are available for testingthe phase elements of the Trip Unit, and two settings (GFand GFT) are provided for testing the ground element.

4.2 When To TestTests can be conducted with the breaker in the “con-nected” cell position while carrying load current. How-ever. as stated in the caution note in Section 4.1, goodpractice will limit circuit breaker in-service “trip tests”,where required, to maintenance periods during times ofminimum load conditions. Testing is accomplished withthe breaker out of its cell or in the ‘Test”, “Disconnected”or “Withdrawn” (or Removed) cell positions.Note: Since time-current settings are based ondesired system coordination and protectionschemes, the protection settings selected and presetin accordance with Section 3 above should not be

¥ X*N Effective May 1997



11. 29-888A

Before starting any test sequence, check theUnit Status (Green LED) in the lower right corner ofthe Trip Unit (See Figs. 1 and 9) to be sure it is

blinking on and off about once each second, whichindicates that the Trip Unit is functioning normally.In the event the Unit Status LED is not blinking,install an Auxiliary Power Module (APM) (See Fig.7), or if you have already installed one, check tosee that it is connected correctly. (See Section 1.6.)

If the circuit breaker is carrying current, checkthat the current is not more than 50% of the LongDelay Current Setting ( /r); because the Trip Unitwill not execute your test instructions when itsenses that the current through the breakerexceeds the 50% level. If the current throughthe circuit breaker increases to a value greaterthan 50% of the Long Delay Current Setting, lrthe Trip Unit will automatically abort any TripUnit Test that may be in progress. Should anactual overload or fault condition occur duringan in-service, test sequence, the protectionfunction will override the test function, and thecircuit breaker will trip automatically in accor-dance with the actual Time-Current settings.

When performing tests on the Long Delay ele-ment, be aware that in addition to the standardprotection element, the Digitrip RMS 810 TripUnit also has a Long Time Memory function(LTM), which serves to protect load circuits fromthe effects of repeated overload conditions. (SeeNOTE 1 under section 3.3 Long Delay Time Set-ting.) The action of the LTM during primary injec-tion tests and during tests initiated from the TripUnit Test Panel under the “TEST AMPS” setting of“6T”, will advance the Long Delay Trip Time if multi-ple Long Delay Time tests are performed repeat-edly - as one might do in making single-phase testson each pole of a breaker in succession, for exam-ple. If there is any question, you may simply waitabout ten (10) minutes after a Long Delay Trip forthe LTM to reset. The LTM is not active during testsinitiated from the Trip Unit Test Panel under the“TEST AMPS” settings of “1”, “2”, “3”, “8”, or “10”.

To reset the LTM immediately:

• Set the “TEST AMPS” to “1”.• Press and release the (Black) “TEST” push-button

(timer will be running in the display window), and then• Quickly press and release the ‘TRIP RESET" push-

button before the Trip Unit operates.• Now the LTM will be reset.

1)^ CAUTION

A SETTING OF EITHER 6T OR GFT WILL TRIP THECIRCUIT BREAKER. (SEE SECTIONS 4.1 AND 4.4.2.)FOR ANY COMBINATION OF THE PHASE PROTEC-TION SETTINGS, AN APPROPRIATE “NO TRIP” CON-DITION CAN BE SET TO TEST THE LONG TIME,SHORT TIME AND INSTANTANEOUS TRIP SET-TINGS WITHOUT TRIPPING THE CIRCUIT BREAKER.(SEE SECTION 4.4.1.)IN THE “GF” TEST POSITION, THE LEVEL OF TESTCURRENT, BASED ON ln, IS ADEQUATE TO DEMON-STRATE THE OPERATING CONDITION OF THE TRIPUNIT WITHOUT TRIPPING THE CIRCUIT BREAKER.THIS IS A FUNCTIONAL CHECK ONLY, NOT A CALI-BRATION.

2)

4.4 Conducting TestsTo preserve the primary protection function of the TripUnit, all in-service testing whether under ‘Trip” or“No-Trip” conditions is executed ONLY if load current val-ues are no greater than 50% x lr ( lr = the Long Delay Cur-rent Setting). Any attempt to conduct in-servicetesting when the load current exceeds 50% of lr willNOT be executed by the Trip Unit.Since the Digitrip RMS 810 Trip Unit is designed to runwith control power from the Power / Relay Module for thedisplay window and communications functions, all testingshould be conducted with the control power available,either through the Power Relay Module or, when thebreaker is outside the enclosure, through the AuxiliaryPower Module (APM) (See Section 1.6 and Fig. 7).Although the Trip Unit is designed to perform all of itsProtection Functions without the external control power,and without the display and communication functionsavailable, results of the tests could be confusing. Whenperforming a single-phase primary current injection test,for example, especially when the single-phase current islow, without the APM it may appear as if the Trip Unitdoes not respond until the current is well-above the setvalue, leading the tester to believe there is an error in theTrip Unit when there is none. The reason this occurs isthat the single-phase test current is not a good simulationof the normal three-phase circuit. If three-phase currenthad been flowing, the Trip Unit would actually have per-formed correctly. Use the APM for correct Trip Unit perfor-mance whenever single-phase current injection tests aremade.

3)

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FEET AND OTHER PARTS OF YOUR BODY WELLAWAY FROM ALL MOVING PARTS DURING TEST-ING. FOLLOW THE INSTRUCTIONS GIVEN FORTESTING YOUR SPECIFIC TYPE OF CIRCUITBREAKER, FOUND IN THE APPROPRIATE INSTRUC-TION LEAFLET LISTED IN SECTION 6.

Make sure that the circuit breaker is carrying nocurrent. (See CAUTION notes under Section 4.1.)

Note: In the event it is decided to perform a “BreakerTrip Test” while load current is flowing, make surethe circuit breaker is carrying no more than 50% ofthe Long Delay Current Setting lr The Trip Unit willNOT execute your instructions to Test itself, whenthe load current exceeds 50% of lr

Place the “TEST AMPS" selector switch (See Fig.

9) in either the “6T” (or “GFT) position.Press and release the (Black) “TEST" push-button(See Fig. 9) — the test starts when the push-buttonis released and the elapsed time is displayed in thewindow.

At least one of the various protection settings willbe less than “6 x ln”, and the circuit breaker will trip,

the LED related to that function will light “RED",and the reason for TRIP code will appear in the dis-play window. (See Table 3 for Code meanings.) Ifthe “STEP” push-button is pressed and released atthis point, the “TEST” current value will be shown inthe display window, not the actual current flowing inthe breaker.

Reset the Trip Unit by pressing and releasing the“Trip Reset” push-button (See Fig. 9). All LEDslighted by the “Trip” test action should turn “OFF”,

and the display window will again show the value ofcurrent flowing in the breaker.

When performing tests on the Ground Fault ele-ment, be aware that in addition to the standardprotection, the Digitrip RMS 810 Trip Unit alsohas a Ground Time Memory function (GTM),which serves to protect load circuits from theeffects of repeated (sputtering) ground arcs. (SeeNOTE under Section 3.9 Ground Fault Time DelaySetting.) Because the GTM resets quickly, it will notnormally affect ground fault test results, but ifGround Fault tests are repeated quickly, the GTMcan make the breaker appear to trip too soon.

Note: To STOP a TEST initiated via the integral testpanel, Press and Release the “TRIP RESET” push-

button.

4)

1 .

4.4.1 Not Tripping the Breaker

Place the “TEST AMPS” selector switch (see Fig.9) in one of the six “No Trip” test settings, i.e., 1, 2,3, 8, or 10 x ln, or GF.

Press and release the (Black) “TEST" push-button— the test starts when the push-button is released,and the elapsed time will be displayed in thewindow. When the timer stops, the lighted “RED”cause of trip LED indicates the protection functionwhich operated.

Should any of the various protection settings beless than the selected “No Trip” test value, then theLED related to that function will turn on signifyingsuccessful completion of the test action. Note: Dur-ing the long delay tests the Long Delay LEDflashes “RED”.

Reset the Trip Unit by pressing and releasing the“TRIP RESET” push-button; all LEDs lighted by the“No Trip” test action should turn “OFF”, and the dis-play will again show the value of the currentthrough the breaker. In the event that no one resetsthe Trip Unit after a test, it will wait for about three(3) hours, and then it will automatically revert backto its pretest status.

2.

1.

3.

2.

4.

3.

5.4.

4.5 Testing the Back-up Battery (Inside the RatingPlug)

The battery has no part in the protection function of theTrip Unit.

The battery is provided only to maintain the “RED” LEDindication of the cause of TRIP in the Digitrip RMS 810Trip Unit, when external control power to the Power/RelayModule is not available. The battery is located in the rat-

ing plug along with a battery check push-button and agreen battery check LED. (See Fig. 4.)

4.4.2 Tripping the Breaker

^WARNING

CIRCUIT BREAKER OPERATING MECHANISMSOPEN AND CLOSE THE MOVING PARTS VERYFAST, AND WITH VERY HIGH ENERGY. TOUCHINGTHE MOVING PARTS DURING TEST OPERATIONSCAN CAUSE INJURY. KEEP CLOTHING, HANDS,

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TypeCR 1/3N

4.5.1 Back-up Battery CheckThe battery is a long life, lithium photo type unit. The sta-tus of the battery can be checked at any time. Press andhold the “battery check" push-button and observe the“Green” LED as shown in Fig. 4. If the battery check LEDdoes not light “Green”, replace the battery. The conditionof the battery has no effect on the protection function ofthe Trip Unit. Even with the battery removed, the unit willstill trip the breaker in accordance with its settings. Ifhowever, control power is lost and the battery is dead, thecause of TRIP LED will not be lighted “RED”.

CompanyVarta Batteries, Inc.150 Clarbrook RoadElmsford, NY 10523

DuracellSouth BroadwayTarrytown, NY 10591(914) 591-7000

Sanyo Electric Inc.Battery Div.200 Riser RoadLittle Ferry, NJ 07643

DL 1/3N

CR 1/3N

4.5.2 Replacing the Back-up BatteryThe battery can be easily replaced from the front of theTrip Unit by lowering the hinged cover of the rating plugas shown in Fig. 4. The battery can then be removed bypulling the battery tab as shown in Fig. 4. After the bat-tery is replaced (or after an Auxiliary Power Module isplugged into the Trip Unit), one or more of the cause ofTrip LED's may be illuminated. It is necessary to pressand release the “TRIP RESET” button to turn off any ofthe LEDs that may be illuminated. Failure to do so cancause the battery to run down again. The Trip Unit willthen be ready to indicate the next cause of trip.Note: The battery can be replaced at any time, evenwhile the circuit breaker is in service, without affect-ing the operation of the circuit breaker or its protec-tion function.

5.0 COMMUNICATIONSOne of the most important functions of the Digitrip RMS810 Trip Unit is its ability to communicate both informa-tion and control signals via the Cutler-Hammer Inc. pro-prietary INtegrated COMmunications (INCOM®) LocalArea Network (LAN). INCOM® interconnects micropro-cessor based (and other) electrical distribution and con-trol products, with personal computers into acomprehensive information and control communicationsnetwork. (See Section 5.5.) The Digitrip RMS 810 TripUnit already has INCOM® capability for external commu-nications built into its SpRE+® chip. (See Figs. 2, 11 andthe specific wiring diagrams for your circuit breaker listedin Section 6.) The receiving terminal(s) can be:

• An Assemblies Electronic Monitor (AEM) for local orremote monitoring (See Figs. 10 and 11.1 and refer-ences in Section 6).

• A remote master personal computer (PC) - IBMB com-patible (See Fig. 11.2 and references in Section 6).

• Both an AEM (for local monitoring) and a PC forremote monitoring and control. (See Fig. 11.3 and ref -erences in Section 6).

^ CAUTION

CARE SHOULD BE EXERCISED WHEN REPLACINGTHE BATTERY TO INSURE THAT THE CORRECTPOLARITY IS OBSERVED. POLARITY MARKINGSARE VISIBLE ON THE RATING PLUG WHEN THEHINGED COVER IS OPEN AS INDICATED IN FIG. 4. IFTHE BATTERY IS INSERTED WITH INCORRECTPOLARITY, AND IF THE 120 VAC CONTROL POWERTO THE POWER RELAY MODULE IS LOST, THEN,AFTER AN OVERCURRENT OR SHORT-CIRCUITTRIP, NO LEDS WILL BE LIGHTED RED TO INDICATETHE REASON FOR THE TRIP.

5.1 Trip Unit Address and Baud Rate

To enable the INCOM® communications system to iden-tify each circuit breaker individually, the Digitrip RMS 810Trip Unit has a unique 3-digit “ADDRESS”, whichINCOM® uses to identify the Trip Unit and the circuitbreaker it controls.

The replacement battery should be the same type orequivalent. Acceptable 3.0 volt lithium batteries may beobtained from the following companies under the typedesignation indicated:

FiT'NEffective May 1997



11. 29-888A

4) To decrement the address, press and release the(Black) “STEP” push button also near the displaywindow. (See Fig. 1.) The address will decrease byone unit each time you press the (Black) “STEP”push button. If you press-and-hold the (Black)“STEP” push button, the address will decreasecontinuously, slowly at first, and then faster as youcontinue to hold the button in. (You do need to con-

tinue to hold-in the “TRIP RESET” push buttonwhile you do this.)The letter “H” refers to the High 9600 Baud rate;and the letter “L” refers to the Low 1200 Baud Rate.An “X” in the Baud Rate field indicates that neither“H”igh nor “L”ow Baud Rate has been selected.Press and release the (Black) “TEST' push buttonto change the baud rate. (You do need to continue-to-hold-in the “TRIP RESET’ push button.) Sug-

gestion: Before you press and release the (Black)“TEST” push button, set the “TEST AMPS” switchto “1”, to minimize the effect of an “unintendedtest”, which can occur, if your other finger wouldhappen to come off the “TRIP RESET” push but-ton. For correct communications, be sure to use theterminating resistor at the end of the twisted pair(last element in the INCOM® chain). (See Figures11.1, 11.2, and 11.3, and refer to the IMPACCWiring Specification listed in Section 6.)When the address and baud rate code in the dis-play window are correct, release the “TRIPRESET” push button to save the values into theTrip Unit’s non-volatile memory, and the kA, MW orMWh value will return to the display window. If con-

trol power is lost, the Trip Unit will still know its(new) address and baud rate.

Note: If control power is lost while you are changingthe address or baud rate, i.e. while you are still hold-ing-in the “TRIP RESET” push button, the display willgo blank and when the control power is restored, theTrip Unit will still retain the previous address andbaud rate values, as if you had not been trying tochange them.

NOTICE

NEW DIGITRIP MODEL 810 TRIP UNITS, AND TRIPUNITS PROVIDED AS A PART OF NEW CIRCUITBREAKERS WILL ALREADY CONTAIN A FAC-TORY-SET BAUD RATE AND ADDRESS, WHICH INGENERAL WILL NOT APPLYIO YOUR NETWORK.FOR PROPER COMMUNICATIONS, EACH TRIP UNITADDRESS AND BAUD RATE MUST BE SET TO THEVALUES APPLICABLE FOR YOUR NETWORK. SIMI-LARLY, PRIOR TO THE INSTALLATION OF A TRIPUNIT INTO ITS CIRCUIT BREAKER, OR PRIOR TOINSTALLATION OF A CIRCUIT BREAKER INTO ITSCOMPARTMENT (AFTER MAINTENANCE FOREXAMPLE), THE USER SHOULD VERIFY THAT THEBAUD RATE AND ADDRESS ARE CORRECT. FAIL-URE TO USE THE CORRECT BAUD RATE ORADDRESS CAN CONFUSE THE COMMUNICATIONSSYSTEM. IT IS RECOMMENDED THAT THE APPRO-

PRIATE BAUD RATE, ADDRESS AND CIRCUITBREAKER CELL LOCATION OR BUS OR CIRCUITREFERENCE BE RECORDED IN THE SPACES PRO-VIDED ON THE TRIP UNIT DISPLAY PANEL, FORFUTURE REFERENCE. (SEE FIG. 1.)The user can view the present address and assign a new3-digit address by the following procedure:

Note: The breaker need not be open and may be car-rying current.

Press-and-continue-to-hold-in the “TRIP RESET”push button. (See Figs. 1 and 9.)

Watch the display window, and after about 5 sec-

onds the kA, MW or MWh value will disappear, andeither the letter “H” or “L” (baud rate code), followedby the 3-Digit address (between “001” and “999”,there is no “000”) will appear. (You do need to con-tinue to hold-in the “TRIP RESET” push button.)To increment the address, press and release the(Black) “DEMAND RESET” push button near thedisplay window. (See Fig. 1.) The address willincrease by one unit each time you press the(Black) “DEMAND RESET” push button. If youpress-and-hold the (Black) “DEMAND RESET”push button, the address will increase continuously,slowly at first, and then faster as you continue tohold the button in. (You do need to continue-to-hold-in the “TRIP RESET” push button while you dothis.)

5)

g

6)

1)

2)

3)

NOTICE

AS SHOWN IN FIG. 1, TO THE LEFT AND BELOWTHE DISPLAY WINDOW, IS A SPACE TO RECORDBOTH THE INCOM® ADDRESS, AND THE CELL NO.(TO IDENTIFY THE BREAKER LOCATION WITHINTHE ASSEMBLY). BECAUSE TRIP UNITS AND CIR-

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CUIT BREAKERS OF THE SAME RATING AREINTERCHANGEABLE, IF MORE THAN ONE HASBEEN WITHDRAWN FOR MAINTENANCE AT ONETIME, IT IS CRITICAL THAT EACH UNIT BERETURNED TO ITS CORRECT CELL LOCATION SOTHAT THE CIRCUIT HAS THE CORRECT ADDRESS.FOR EXAMPLE, IF TWO IDENTICAL BREAKERS(ONE WHOSE TRIP UNIT ADDRESS IS “001” ANDTHE OTHER WHOSE TRIP UNIT ADDRESS IS “100”)WERE SWITCHED, THE INCOM® COMMUNICATIONSSYSTEM WILL BE CONFUSED AND THE INFORMA-TION COMING FROM THE “001” TRIP UNIT, AS WELLAS THE COMMANDS GOING TO THE “001” TRIPUNIT WILL ACTUALLY INVOLVE THE “100” CIRCUIT,AND VICE VERSA.

5.2 Remote Master Computer

To communicate with a remote master (IBM® compatible)personal computer, install a Cutler-Hammer Inc. Com-puter Operated Network Interface (CONI) card into thecomputer frame (chassis). The connections in the net-work are then made by twisted pairs of wires as shown inFig. 11.1.

Effective May 1997



I.L. 29-888A

Typical IBM (or IBM

Compatible) Computer

Twisted Pair.No. 18 AWG, (See Section 5.5for cable specifications)

SeeView *A'

Cut-off Shield at lastDevice - Do Not Ground^Coni. Card

TypicalCircuitBreakerwithDIGITRIP RMS 810Trip Unit

©Baud Rate

and

3 DigitINCOMAddressSee Section

T IHIIIOLOL

(Y) 15.12

3(BL) 4

View A

O Refer to circuit breaker connection diagrams referenced in Section 6 for actual connections.

© Modular telephone connector. Type RJ11, supplied by user.© Ground shielding at computer only as shown. Where devices are daisy-chained, interconnect shielding, but do not ground

the connection.0 1/2 wan carbon resistor required at last breaker. See T.D. 17-513.

Fig. 11.1 INCOM with Remote Master Computer

AssembliesElectronicMonitor(AEM)

Twisted Pair.No. 18 AWG, (See Section 5.5for cable specifications)

©SeeView

Cut-off Shield atDevice - Do Not Ground


0 ResBaud Rate

ands i 3 DigitINCOMAddressSee Section

IH21 0111

< Y) 15.12

DIGITRIP RMS 810Trip Unit3

(BL) 4View A Note: OK to mix Models 700, 800 and 810 Trip Units if Baud Rate L=1200 is used.

0 Refer to circuit breaker connection diagrams referenced in Section 6 for actual connections.0 Ground shielding at AEM only as shown. Where devices are daisy-chained,

interconnect shielding, but do not ground the connection.@ 1/2 watt carbon resistor required at last breaker. See T.D. 17-513.

Fig. 11.2 INCOM Network with AEM

Effective May 1997



I.L. 29-888A

AssembliesElectronicMonitor(AEM)

Typical IBM lor IBMCompatible) Computer

/ 0u SeeView "A" Twisted Pair.

No. 18 AWG. (See Section 5.5for cable specifications.)

V

i See View “A’V. Cut-off Shield at

Device - Do Not Ground® Coni. Card


Baud Rateand

- 3 DigitINCOMAddressSee Section

H O 0 1

(Y) 12 5.13

(BL) 4View A

0 Refer to circuit breaker connection diagrams referenced in Section 6 for actual connections.© Modular telephone connector.Type RJ11,supplied by user.© Ground shielding at computer and AEM (cable to P1 only) as shown. Where devices are daisy-chained, interconnect shielding, but

do not ground the connection.© 1/2 watt carbon resistor required at last breaker. See T.D. 17-513.

Fig. 11.3 INCOM Network with Remote Master Computer and AEM

5.3 Assemblies Electronic Monitor (AEM)An Assemblies Electronic Monitor (AEM) (see Fig. 10)can be applied in the same assembly with the circuitbreakers, or at a location remote from the breakers, tomonitor the information from any of the Digitrip RMS 810Trip Units. The connections in the network are made bytwisted pairs of wires as shown in Fig. 11.2. Digitrip RMS810 Trip Units should be set to communicate at 1200Baud when applied on the same network with DigitripRMS 700 and 800 Trip Units. (See Section 5.1, item 5.)

5.5 INCOM® Network Interconnections

INCOM® sends bursts of data on a 92 to 115.2 kHz car-rier at rates up to 9600 baud, over twisted pair conduc-tors, to interconnect the many devices comprising thenetwork.Recommended cable specifications:

• Cutler-Hammer Inc. cable catalog #IMPCABLE, Style#2A95705G01

• Belden 9463 cable family• Identical Commscope or Quabbin cables

These bursts of data can be captured and used in a vari-ety of ways depending upon the manner in which themaster computer software program is written. For exam-ple, the data for the individual phase current values areavailable on the network, but the software must select theappropriate data, decode and display it in a useful man-ner. Following an over-current trip operation, thesequence of coded data varies slightly. The cause of trip,

and the value and phase (or ground) current, responsiblefor the trip are available on the network. If a TRIP were

5.4 Remote Master Computer and AEM BothWhen desired, Digitrip RMS 810 Trip Units can communi-cate with both an Assemblies Electronic Monitor (AEM)and a remote master computer (IBM PC compatible withCutler-Hammer Inc. CONI card as noted in Sec. 5.2). Theconnections in the network are then made by twistedpairs of wires as shown in Fig. 11.3.

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initiated due to a Short-Time Delay over-current condi-tion, for example, the coded message for “SDT” would betransmitted by the Trip Unit. Once the message isreceived and interpreted by the software, the value ofcurrent can be retrieved and the applicable phase can beidentified, along with the time of trip and the value of thetrip event counter. As long as control power remainsavailable to the Power / Relay Module, the reason for trip,and the values of current in the other phases, includingneutral and/ or ground at the time of trip, as well as thevalues of each protection setting, also remain availableuntil the Trip Unit is reset. Effective utilization of the infor-mation available over the INCOM® network requiresappropriately designed software, such as the Cutler-Hammer Inc. IMPACC® system, or your own custom soft-ware system.

For detailed instructions about interconnecting devicesover an INCOM 5 network, see IMPACC® wiring specifi-cation T.D. 17-513.

TABLE 5 DIGITRIP RMS 810 COMMUNICATION FUNCTIONSShort-Time Delay:

Current Setting (Pick-up)Time Delay SettingOpt. “I squaredV Curve Shape

X XX XX X

X XX XX X

3.43.53.5

Instantaneous:

Current Setting (Pick-up)DISCriminator (11x) IN or OUT

X X X X 3.6X X 1.1.3

Ground Fault:Current Setting (Pick-up)Time Delay SettingOpt. “I squared T Curve Shape

X X XXXXXXX

3.83.93.9

View Current Values:Phase A Current [la] (kA)Phase B Current [lb] (kA)Phase C Current [lc] (kA)

XXXXXXXXX

XXXXXXXXX

1.2.1.1

Ground Current [Ig] (kA)Neutral Current [Id] (kA)

XXX1.2 . 1.1n n n

View Power / Energy Values;

Peak Power Demand (MW)Present Power Demand (MW)

Reverse Power Flow

XXXXXXXXX

XXXXXXXXX

1.2.1.2

Energy Consumption (MWh)Reverse Energy Consumption

XXXXXX

XXXXXX 1.2 .1.2

View Power Factor Value: 5.7r r r r r r

View Remote Messages:5.6 Information Communicated by Digitrip RMS 810The Digitrip RMS 810 Trip Unit utilizes the Cutler-Ham-mer Inc. INCOM® serialized protocol to send out codedmessages. The coded messages can be interpreted bysystem level software, such as the Cutler-Hammer Inc.IMPACC® system, to display any of the information that islisted in Table 5:

Table 3Table 3Table 3

DISC = DISCriminator TripEXTT = EXTernal TripGNDT = GrouND Trip

X XXXX XXX

XXXXXXX XXXX

Table 3Table 3Table 3

HILD = High LoaD AlarmINST = INStantaneous TripLDPU = Long-Time Delay Pick-Up

XXXX XXXX

XXXr r rXXX1 1 1

XXXr r rXXX1 1 1

Table 3LDT = Long-Time Delay TripNORM = NormalNPOW = Negative POWer flowORID = OverRIDe Trip

Table 3Table 3Table 3Table 3Table 3

ORNG = OverRaNGe TripPLUG = Rating PLUG ProblemSDT = Short-Time Delay Trip

XXXXXX

X X

XXXXXX

X X

TABLE 5 DIGITRIP RMS 810 COMMUNICATION FUNCTIONS NRES = Communications FailureTEMP = OverTEMPerature TripTEST = TEST ready to begin

r r rXXXXXX

r r rXXXXXX

Table 3Table 3RMS DIGITRIP 810Trip Unit TYPE

REMOTE CONTROLvia INCOM / IMPACC:

S S S8 8 84 5 63 3 3L L LI S SG G I

S S S8 8 81 2 33 3 3L L L

S S

XXXXXXXXX XXX 5.8Refer to

SectionNumber

TRIP (OPEN) Circuit Breaker CommandCLOSE Circuit Breaker CommandRESET TRIP UNIT CommandRESET Demand. Energy, Trip Event

5.8Catalog NumberXXXXXX

X X XXXX

5.9I 5.9

ILEGEND: x = Function Included

n = Circuit Breaker must be equipped for Neutral Protectionr = This Information can be viewed only REMOTELY by INCOM /

IMPACC, but NOT LOCALLY at Trip Unit Display Window1 = n/a for Type DS Breakers* = Requires purchase of optional Electrical Operator or Spring

Release Option with Circuit Breaker, and the Trip Unit may haveto be RESET before the breaker can close.

G81 82 83 84 85 86Suffix Number

I.L. 29-888Instruction Leaflet No.REMOTE INFORMATION

via INCOM / IMPACC: 5.6XXXXXXView Breaker Status:

X X X 5.6XXXOPEN / CLOSED / TRIPPEDInformation available for remote display includes:

• Status of circuit breaker: “Closed”, “Open” or ‘Tripped”• All Protection Settings (see Section 3)• All Information displayed in the Trip Unit window:• Phase and Ground or Neutral current values• Power and Energy Demand parameter values• Coded Messages regarding status of the circuit

xxx xxx 5.1Address Register & Baud RateView Trip Event Values:

5.6Trip Event Time r r rr r r5.6Trip Event Counter r r rr r r

View Protection Settings:

Long-Time Delay:XXXXXX

3.2XXXXXX

Current Setting (Pick-up)Time Delay Setting 3.3

F:T»N Effective May 1997



I.L. 29-888A

values of the currents through the circuit breaker will be“zero” when it is OPEN.)Refer to the IMPACC® System Communications refer-

ence programming guide (see Section 6) for more infor-mation. The information available through INCOM® isactually greater than that available locally through theTrip Unit display itself. For example, with INCOM®, onecan view the present system power factor, the time of tripevent and trip event counter remotely, even though thesevalues are not available for display locally in the Trip Unitwindow.

^WARNING

UNEXPECTED SIGNALS TO “CLOSE” OR “TRIP” ACIRCUIT BREAKER FROM A REMOTE LOCATION BYTHE COMMUNICATIONS NETWORK CAN CAUSEPERSONAL INJURY TO MAINTENANCE PERSONNELWORKING IN THE IMMEDIATE VICINITY OF THE CIR-CUIT BREAKER. PROVIDE PERMISSIVE CONTROLSWITCHES, OR OTHER MEANS, LOCALLY AT THECIRCUIT BREAKER FOR MAINTENANCE PERSON-NEL TO USE IN CONTROLLING REMOTE “CLOSE”OR “TRIP” SIGNALS. FOR DETAILED INFORMATIONCONCERNING THE BREAKER CONTROL CIRCUITSNECESSARY TO IMPLEMENT PERMISSIVE CON-TROL LOCALLY, REFER TO THE CIRCUIT BREAKERCONNECTION DIAGRAMS LISTED IN SECTION 6.

5.7 System Power Factor (Remote)The Digitrip RMS 810 Trip Unit can send the presentvalue of the system power factor to a remote terminal -even though system power factor is not available for dis-play locally in the Trip Unit window. The range, assump-tions and accuracy for the system power factor functionvalues are:

from - 0.5 [Lagging] to + 0.5 [Leading]ASSUMES: balanced three-phase load, per ANSI Std.

C12.1 - 1988.> 20% of Frame Rating for Series C®

R-Frame or Type SPB circuit breakers,> 20% of [Current] Sensor Rating for TypeDS circuit breakers.

RANGE:

5.9 Remote Resetting of the Trip UnitCurrent:

NOTICECurrent:

BEFORE RESETTING TRIP UNIT, BE SURE TO:

• RECORD DISPLAY VALUES OF ALL PERTINENTPARAMETERS

ACCURACY: ± 0.02

5.8 Remote Closing and Tripping of Circuit Breakers

The Digitrip RMS 810 Trip Unit can respond to com-mands from the remote master computer to ‘TRIP” thecircuit breaker remotely; and furthermore, if the circuitbreaker has been equipped with the applicable optionalelectrical operator or spring release feature, the DigitripRMS 810 Trip Unit can respond to commands from theremote master computer to “CLOSE” the circuit breakerremotely. The CLOSE command causes the “Communi-cations Close” contact in the Power Relay Module toclose (see wires CC1 and CC2 in Fig. 2), making the cir-cuit breaker’s closing control circuit, and releasing it toclose. (See the connection diagram applicable for yourcircuit breaker listed in Section 6.) When the ElectricalOperator or Spring Release option is purchased for thecircuit breaker, the Communications Close contact iswired into the close release circuit at the factory. TheTRIP command causes the Digitrip RMS 810 Trip Unit tooperate the circuit breaker’s trip release (see “0” in Fig.2). The trip release remains locked-out, so that the circuitbreaker cannot be reclosed, until the Trip Unit is reset.(See Section 5.9.) The Trip Unit displays “EXTT” in itswindow and sends back the “EXTT” message overINCOM to the remote master computer. (Note that the

• NOTE WHICH CAUSE OF TRIP LEDS ARE LIGHTED“RED”

• CORRECT THE CAUSE OF THE OVERCURRENTOR FAULT CONDITION THAT CAUSED THEBREAKER TO TRIP.

BECAUSE THE AUTOMATIC LOC/COl/T-AFTER-TRIPFEATURE OF THE DIGITRIP RMS 810 TRIP UNITMAINTAINS THE CIRCUIT BREAKER IN A “TRIP-FREE” CONDITION, THE TRIP UNIT MUST BE RESETAFTER EACH TRIP OPERATION (WHETHER INITI-ATED BY OVER-CURRENT CONDITIONS OR BYREMOTE INCOM®/ IMPACC® SIGNAL), BEFORE THEBREAKER CAN BE CLOSED AGAIN. THE RESETCAN BE ACCOMPLISHED EITHER LOCALLY BYPRESSING AND RELEASING THE “TRIP RESET”

PUSH BUTTON (SEE FIG. 1), OR REMOTELY BY THEIMPACC® SYSTEM.

Although the reset can be accomplished locally by press-ing and releasing the “TRIP RESET” push button (SeeFig. 1), it is sometimes inconvenient or untimely to go tothe circuit breaker in order to reset the Trip Unit. For such

"NEffective May 1997



11. 29-888A

cases where the circuit breaker is far from the plant con-trol room, the IMPACC® system provides the user with ameans for resetting the circuit breaker through the com-munications network ‘Trip Unit Reset” command. Execut-ing the Trip Unit Reset command remotely from themaster computer by the INCOM® / IMPACC® system isexactly equivalent to pressing and releasing the “TripReset” push-button on the front of the Trip Unit.In addition to the Trip Unit Reset capability, the INCOM® /IMPACC® communications capability of the Trip Unit, pro-vides the user with a means for resetting several parame-ter values stored in the Trip Unit’s memory. Using theproper commands, the user can view and reset the fol-lowing trip event buffer parameters remotely: time of trip,values of phase and ground currents, number of electron-ically initiated trip operations, peak [power] demand,energy and the cause of trip.

6.4 Series C® R-Frame Molded Case Circuit BreakersFrame BookFrame Instruction LeafletSupplementary Instructions for Series CR

R-Frame used with the Digitrip RMS TripUnits

Typical Time-Current Characteristic Curvesfor R-Frame Circuit Breakers

Instantaneous ( I)Long Delay and Short Delay (LS)Ground (G)Master Connection Diagram for Series CR

R-Frame Circuit Breakers

29C10629C10729C713

AD 29-167R

SC-5626-93SC-5627-93SC-5628-93LL. 29C714

6.5 Assemblies Electronic MonitorsI.L. 17-216I.L. 17-382

AEM - IAEM - II

6.6 INCOM® and IMPACC® CommunicationsIMPACC 6 System CommunicationsInstructions for Computer Operated Net-

work Interface Card used in INCOMBNetworks

IMPACCB Wiring Specifications

I.L 17-384I.L 17-1996.0 REFERENCES

6.1 Digitrip RMS Trip AssembliesI.L. 29-885I.L. 29-886I.L 29-888

Instructions for Digitrip RMS 510 Trip UnitInstructions for Digitrip RMS 610 Trip UnitInstructions for Digitrip RMS 810 Trip Unit

T.D. 17-531

LIST OF FIGURES6.2 Type DS Low-Voltage AC Power Circuit BreakersI.B. 33-790-1 PageFigureInstructions for Low-Voltage Power Circuit

Breakers Types DS and DSLDigitrip RMS 510, 610 and 810 Trip Unitswith Types DS and DSL Low-Voltage

Power Circuit Breakers

RMS Digitrip 810 Trip Unit with Rating P l u g . . . 3RMS Digitrip 810 Trip Unit - Block Diagram . . . 4RMS Digitrip 810 Trip Unit - Long Delay andInstantaneous ProtectionRMS Digitrip 810 Trip Unit - Long Delay andShort Delay ProtectionRMS Digitrip 810 Trip Unit - Long Delay,Short Delay and Instantaneous Protection. . . . 6RMS Digitrip 810 Trip Unit - Long Delay,Instantaneous and Ground Protection . .RMS Digitrip 810 Trip Unit - Long Delay,Short Delay and Ground Protection . . . .RMS Digitrip 810 Trip Unit - Long Delay,Short Delay, Instantaneous and GroundProtection

1Supplement Bto I.B. 32-790-1

23.1

6Typical Time-Current Characteristic Curves

for Types DS and DSL Circuit BreakersInstantaneous (I)Long Delay and Short Delay (LS)Ground (G)Connection Diagram for Type DS Circuit

Breakers

AD 32-870 3.26SC-5619-93

SC-5620-93SC-5621-93

508B508

3.3

3.46

3.56.3 Type SPB Systems Pow-R Breakers

Instruction for the Systems Pow-R Breakerand Drawout Mechanism

Supplementary Instructions for theSystems Pow-R Breaker used with theDigitrip RMS Trip Units

Typical Time-Current Characteristic Curvesfor Type SPB Systems Pow-R Breaker

Instantaneous (I)Long Delay and Short Delay (LS)Ground (G)SPB Master Connection Diagram

7I.L 29-801 3.6

I.L. 29-849 7Rating PlugPower Relay Module

114125AD 29-863 13PTM6

Auxiliary Power ModuleLong Delay Current Settings . .Long Delay Time SettingsShort Delay Current Settings . .Short Delay Time SettingsInstantaneous Current Settings

147SC-5623-93SC-5624-93SC-5625-93

I.S. 15545

158.1. . . . 158.2

158.3168.4168.5

E:T*N Effective May 1997



I.L. 29-888A

There is no Zone Selective Interlocking,

(standard time delay coordination isused)

CASE 1:8.6 Ground Fault Current Settings8.7 Ground Fault Time Delay Setting

Integral Test Panel10.1 AEM Assemblies Electronic

Monitor (AEM-I)10.2 AEM Assemblies Electronic

Monitors (AEM-II)11.1 INCOM with Remote Master Computer . . .11.2 INCOM Network with AEM11.3 INCOM Network with Remote

Master Computer and AEMA.1 Typical Zone Interlocking

(Ground Fault Protection)A.2 Typical Zone Interlocking Connections

with Two Main Breakers (M1, M2) and a TieBreaker (T) (Short Delay Protection)

1717189

Fault 323 The branch breaker will trip clearing the fault in 0.1 s.

Fault 223The feeder breaker will trip clearing the fault in 0.3 s.24

24 Fault 1The breaker will trip clearing the fault in 0.5 s.

25CASE 2: There is Zone Selective Interlocking

30 Fault 3The branch breaker trip unit will initiate the trip in0.03 s to clear the fault and Z3 will send an interlock-ing signal to the Z2 trip unit; and 72 will send aninterlocking signal to Z1.Z1 and Z2 trip units will kegin to time out, and in theevent that the branch breaker Z3 would not clear thefault, the feeder breaker Z2 will clear the fault in 0.3 s(as above). Similarly, in the event that the feederbreaker Z2 would not clear the fault, the main breakerZ1 will clear the fault in 0.5 s (as above).

30

LIST OF TABLES

PageTable1 Digitrip RMS 810 Protection Functions . . .2 Digitrip RMS 810 Information Functions . .3 Digitrip RMS 810 Trip Unit Message Codes

and Their Meanings4 Ground Fault Current Settings5 Digitrip RMS 810 Communication Functions

58

10 Fault 216 The feeder breaker trip unit will initiate the trip in

0.03 s to clear the fault; and Z2 will send an interlock-ing signal to the Z1 trip unit. Z1 trip unit will begin totime out, and in the event that the feeder breaker Z2would not clear the fault, the main breaker Z1 willclear the fault in 0.5 s (as above).

26

AppendicesAPPENDIX A Zone Interlocking

APPENDIX B Interpreting Display Codes afterCircuit Breaker Trips

Page29

31 Fault 1There are no interlocking signals. The main breakertrip unit will initiate the trip in 0.03 s.APPENDIX A ZONE INTERLOCKING

Assume a ground fault of 2000 Amperes occurs andrefer to Fig A.1.

Figure A.2 presents a Zone Selective Interlocking con-nection diagram for a system with two main breakersfrom incoming sources and a bus tie breaker. Note theblocking diode D1 is needed so that the feeder breakerscan send interlocking signals to both the main and tiebreakers, without having the tie breaker send itself an ter-

locking signal.

F T'NEffective May 1997



I.L. 29-888A

NOTES: A1: Wiring to be twisted pair of AWG No.14 to AWG No. 20.Route Zone Interlocking wiring sepa-rate from power conductors.DO NOT GROUND any Zone InterlockWiring.The maximum distance between firstand last zone is 250 feet (110 m).A Maximum of 20 breakers may beconnected in parallel in one Zone.

I) Z1Main3200 A

\r 0.5 Sec1200 A A2:

I z'* * 1600 AA3:

) Feeder C§ 1N Z2

i- 0.3 Sec400 A GO

Gl

~ z'05 -r 200 A

Legend) Branch

§ 2 =Common (Ungrounded)cNc = Short Delay Output Signal

to Higher Level Zone= Short Delay Input Signal

from Lower Level Zone=Ground Output Signal

to Higher Level Zone=Ground Input Signal

from Lower Level Zone

SOi- 0.1 Sec100 A

Z3SI

GO GOro

3^ Gl05C GloN

A-2Fault at Location 2

Fig. A.1 Typical Zone Interlocking (Ground FaultProtection)

M2Mlcc

sosoSISI

0.5 Sec0.5 Sec

SOSI

1N4004 SF220.3 SecF11 F12 D1 F21 F23

CC C C CSOso so sosoSISI SI SISI

0.1 Sec0.1 Sec 0.1 Sec 0.1 Sec0.1 Sec

Fig. A.2 Typical Zone Interlocking Connections with Two Main Breakers (M1, M2) and a Tie Breaker (T) (Short DelayProtection)

FX*M Effective May 1997



I.L. 29-888A

APPENDIX B INTERPRETING DISPLAY CODESAFTER CIRCUIT BREAKER TRIPS NOTICE

Given a 1600 A frame circuit breaker with anln = 1000 A rating plug installed.

CASE 1 - Overload Trip Operation and High LoadCondition

Long Delay Current (Pick-up) Setting = 1.0, lr = 1000 A

Assume a prolonged 1500A overload condition whichresults in an automatic breaker trip operation. The follow-ing will occur:

• The Long Delay Trip LED will turn “On” (see Fig. 1).• The coded message “LDT" will appear in the Display

Window (see Fig. 1).• The Long Delay Relay in the Power / Relay Module

(see Figs. 2 and 5) will operate to close the remoteLong Delay Trip Alarm Contact.

Operator Actions:Observe the mode of trip LED and coded messagein the Display Window.Press and release “STEP” push-button (see Fig. 1).This will clear the coded cause of trip message inthe Display Window.

View values of phase currents in Display Window(see Fig. 1) e.g., 1.50 kA.

Note: The phase current shown will be that identifiedby the “green” LED (see Fig. 1) that is turned “On”,assume “lA”. (It may not be the faulted phase.)

Press and release the “STEP” push-button to viewcurrent values similar to “lA”, “lB”, “lc”, “lG,” and “lD”.Each value of phase current kA appearing in theDisplay Window, is the value at the time of the tripoperation.

RECORD all Values of interest; note which “RED”LEDs are lighted BEFORE resetting the Trip Unit.

Reset the Trip Unit by pressing and releasing the“Trip Reset” push-button (lower right corner of TripUnit, see Fig. 1). All coded messages and/or cur-rent values in the display window and the cause oftrip LED will turn “Off”, and the Remote Alarm con-tacts in the Power / Relay Module will be reset(open).

FOLLOWING LDT TRIP OPERATIONS, IT IS ESSEN-TIAL THAT ANY CAUSE OF OVERLOAD TRIP BECORRECTED PRIOR TO RECLOSING THE CIRCUITBREAKER. SHOULD IT NOT BE CORRECTED ANDTHE CIRCUIT BREAKER BE RE-CLOSED TOOQUICKLY, THEN BECAUSE OF THE INHERENT LONGTIME MEMORY FUNCTION (SEE NOTE IN SECTION3.3), THE LONG DELAY TRIP ELEMENT WILL OPER-

ATE FASTER THAN THE RELATED TIME-CURRENTCURVE INDICATES.THE AMOUNT OF TIME REQUIRED TO CLEAR THELTM MEMORY CIRCUIT IS A FUNCTION OF THELONG DELAY TIME SETTING (SEE FIG. 3.3). THELONGER THE DELAY SETTING, THE LONGER THETIME REQUIRED TO RESET THE MEMORY. TOTALMEMORY CLEARING TIME COULD BE UP TOTWELVE (12) MINUTES. THE LTM CAN BE RESETQUICKLY AS DESCRIBED IN SECTION 4.4 (3).The LTM memory function, simulates the conventionalthermal type (bi-metal) circuit breaker Trip Unit andserves a useful function by allowing the load conductorsto cool down after an overload condition.

After correcting the cause of the overload trip(LDT), allow for the LTM memory circuit to resetand reclose the circuit breaker to restore power tothe load circuit.

Note: As the current approached the overload condi-tion, prior to the overload trip operation, the follow-ing Trip Unit indications would have been visible.• The “HILD” message would begin to flash in the win-

dow when the overload condition had exceeded 0.85 xlr for 40 seconds or longer. To clear the “HILD” mes-

sage and to view the present magnitudes of the cur-

rents, press and release the (Black) “STEP” pushbutton on the display panel. Remember to push the“STEP” button several times to be sure you see valuesof currents in all phases, and ground / neutral as appli-cable.

• The “High-Load” Relay in the Power / Relay Module(see Figs. 2, 5 and Section 1.4) would have beenpicked up (after a 40-second delay), to close theremote High Load Alarm Contact. Press and releasethe “TRIP RESET” push button to reset the High LoadRelay Contact, or reset the Trip unit remotely byINCOM®. (See Section 5.9.)

1 .

2.

7.3.

4.

5.

6.

F:T‘NEffective May 1997



I.L. 29-888A

• The Long Delay LED (Fig. 1) begins to flash “On” and Each value of phase current appearing in the DisplayWindow, is the value at the time the trip operationwas initiated.

RECORD all Values of interest; note which “RED”LEDs are lighted BEFORE resetting the Trip Unit.The value of one phase current in display window(see Fig. 1) will have been the 12.0 kA fault level.

NOTE: Had the level of the fault current been morethan 28 x ln (or 28 kA in this example) when the rea-son for trip message would be cleared (by pushingthe “STEP” button), instead of the numerical value ofcurrent in kA, the “ORNG” code is displayed to showthe current level exceeded maximum range of cur-rent sensor accuracy.

After making sure you have a record of all pertinentinformation stored in the Trip Unit memory, resetthe Trip Unit by pressing and releasing the “TripReset” push-button. (Lower right corner of the TripUnit see Fig 1.) All coded messages, values of cur-rent in the display window memory, cause of tripLEDs will turn “OFF”, and the Remote Alarm Con-tacts of the signal relay in the Power/ Relay Modulewill reset (open).Following any corrective actions and / or inspec-tions of the circuit breaker and related equipment,re-close the circuit breaker to restore power to theload circuit.

“Off”.• The message “LDPU” begins to flash in the display

window when the current value exceeds lr .

CASE 2 - Instantaneous Trip OperationInstantaneous Current (Pick-up) Setting = 8 x ln = 8000 AAssume a 12 kA fault occurs.Following the TRIP operation, the following will occur:• The Instantaneous Trip LED will turn “On” (see Fig. 1).• The coded message “INST” will appear in the Display

Window (see Fig. 1).• The Short-Circuit Relay in the Power / Relay Module

(see Figs. 2, 5 and Section 1.4) will operate to closethe Remote Short-Circuit Trip Alarm contact.

Operator ActionsObserve the mode of trip LED and the “INST” mes-sage in the Display Window.Press and release the “STEP” push-button to viewcurrent values “lA”, “lB", “lc” and "lG” or “lD” in thedisplay window.

Note: The phase current value displayed will be thatidentified by the “green” LED (see Fig. 1) that isturned “On”. (But, the first value you see may not befor the faulted phase.)

3.

4.

5.

1.

2.

6.



cutler-hammer instructionsfordigitriprms810tripunit

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