INSTRUCTION MANUALFOR

MINIMUM/MAXIMUM EXCITATION LIMITERModel: EL 200

Part Numbers: 9 1747 00 1109 1747 00 1139 1747 00 1149 1747 00 115

LBasler ElectricPublication Number: 9 1747 00 995

Date: September, 1992Revision: C 10/97

WARNING

To prevent personal injury or equipment damage, onlyqualified technicians/operators should install, operate,or service this device.

CAUTION

Meggers and high potential test equipment should beused with extreme care,

equipment could damage components contained in thedevice.

Incorrect use of such

CONFIDENTIAL INFORMATION

of Basler Electric Company, Highland, IL. It is loaned forconfidential use. Subject to return on request and with themutual understanding that it will not be used in any mannerdetrimental to the interests of Basler Electric Company.

It is not the intention of this manual to cover all details andvariations in equipment, nor does it provide data for everypossible contingency regarding installation or operation.The availability and design of all features and options aresubject to change without notice. Should further informationbe required, call Basler Electric Company, Highland, IL.

REV CECA 16371

©1997, Basler Electric Co., Highland, IL 62249

SECTION 1

GENERAL INFORMATION

1-1. DESCRIPTIONa. The Basler Electric Minimum/Maximum Excitation Limiter (Model: EL 200) performs two func-tions. As a maximum excitation limiter, it senses the field current output of the voltage regulatoror static exciter and limits the field current to prevent overheating of the field. As a minimumexcitation limiter, it senses the leading volt-ampere-reactive (VAR) output of the generator and limitsany further decrease in excitation (as necessary) to prevent loss of synchronization and end ironheating during parallel operation.

b. The EL 200 Excitation Limiter has circular characteristic that is compatible with typical genera-tor reactive capabilities as shown by Figure 1-1.

Figure 1-1. Typical Generator Reactive Capability.

1-2. APPLICATIONThe EL 200 Excitation Limiter can be used with the following Basler voltage regulators and excita-tion systems: SSR, XR2001, XR2002, XR2003, SR-A Series, SR-F Series, SR-E Series, SR-HSeries, SSE, and SER-CB. The EL 200 is designed for use on generating systems and can beused on a synchronous motor or condenser if the procedures in Chapter 4 are followed exactly.Additionally, the Basler Electric EL 300 has been designed to fulfill most motor applications and ispreferred over the EL 200 for this type of application.

1-3. SPECIFICATIONSRefer to Table 1-1 for the electrical specifications and to Table 1-2 for the physical specifications.

1-1

Table 1-1. Electrical Specifications.

90 - 139/180 - 264/342 -528/540 - 660 Vac, ±10%, 50/60 Hz.Input Voltage:Burden: 12 VA maximum.

2.5 to 5.0 A full-rated load, 0.8 pf, 5 VA Burden.Current TransformerInput:

Output:

Drift:

±8 Vdc.Less than 5% of nominal per 50°C change.

Field Current:EL 200-2:EL 200-7:

0.5 to 2 A (P/N 9 1747 00 115)2 to 7 A (P/N 9 1747 00 110):

below 36 A use appropriate EL200 without external transducer.36 to 100 A use multiple pri turns.100 to 200 A use transducer P.N. BE14968-001.200 to 400 A use transducer P.N. BE15681-001.

5 to 20 A (P/N 9 1747 00 113)10 to 36 A (P/N 9 1747 00 114)

10 A @ 24 Vdc/240 Vac/120 Vac;0.5 A @ 125 Vdc.0 to 60 seconds.

EL 200-20:EL 200-36:

Output ContactsRating:

Time Delay:

Table 1-2. Physical Specifications.

8.2 inches (208 mm) X 11.5 inches (292 mm) X 4.2 inches (107mm).10 lbs (4.6 kg) net.-65°C (-85°F) to +85°C (+185°F)

Overall Dimensions:

Weight:Storage TemperatureRange:

Operating Tempera-ture Range:Vibration:

-40°C (-40°F) to +70°C (+158°F)

Withstands the following:2 to 27 Hz. at 1.3 G's;27 to 52 Hz. at 0.036 inch double amplitude;52 to 1000 Hz. at 5.0 G's.

Withstands up to 15 G's in each of three mutually perpendicularaxes.

Shock:

1-2

SECTION 2

THEORY OF OPERATION(Refer to Figure 2-1)

2-1. POWER SUPPLYa. The EL 200 senses the generator voltage through transformer T2. This transformer has tapsfor use with the following input voltages: 90-139, 180-264, 342-528, and 540-660 Vac, ±10%, 50/60Hz.

b. A portion of the transformer (T2) output feeds the regulated power supply to produce a +14 Vdcand a -14 Vdc output for operating the limiter circuitry. The transformer (T2) also provides refer-ence signals to the VAR detector, the watt detector, and power to the dc transducer (transformerT3).

f GENUFTLD

TO LOADrryvs CT

REFERENCE EL 200KVARCAL VARVAR . CURVE

^ SELECTOR? DETECTOR COMPARATOR(R1) h a a

FORWARDWATT

AMPLIFIER

T2 POLARITYSELECTEDWATT

DETECTOR

REVERSEWATT

AMPLIFIER OUTPUTAMPLIFIER

REGULATEDPOWER SUPPLY

I* CALIBRATIONCIRCUITALL CIRCUITRY TO VR OR EXCITER

DS4 ( ORG)

REFERENCEGENERATOR UNDER

EXCITATIONDETECTOR

+DELAYED LIMITADJUST (R32)

RE?SE? T^—A UNDERK1J EXCITATION'T RELAYACTIVE

TIMER^ DETECTOR

i i FIXEDEXCITEROR VOLTAGEREGULATOR

DS3 ( YEL)DS1 (GRN)

INSTANT LIMITADJUST (R33) * INSTANT

LIMITERi y OVER EXCITATION

DETECTOR< —*A OVERK3j EXCITATION

RELAYFIXED

^ TIMERDELAYEDLIMITER

INVERSE .TIMER ^

tt D2693-1809-26-97DS2 (RED)ADJ. (R36) RESET ADJ. (R 40)

Figure 2-1. Excitation Limiter Block Diagram.

2-2. VAR LIMITING CIRCUITRYa. Transformer T1 receives a 0 to 5 A signal from an external current transformer (CT) whichsenses the generator output current. The output of T1 is passed to the VAR and Watt detectors.

2-1

b. The VAR and Watt Detectors convert the ac inputs to dc outputs which represent (by polarityand amplitude) the VAR and Watt components of the generator output current. The output of theVAR detector passes through a tapped resistor network (Curve Selector) to the VAR Comparator.The VAR Comparator makes a comparison of the Curve Selector output with a dc referencevoltage. If the leading VAR component (generator current) is higher than the reference voltage,the Comparator outputs a signal through the voltage regulator/exciter that will cause an excitationlimiting and thus, prevent operation outside the limit. This VAR limiting action would normallyproduce a limiting threshold (Refer to Figure 1-1) that would approach being a horizontal line at the-0.4 to -0.6 per unit level. To produce the desired output curve, a Watt signal is passed throughthe Forward Watt Amplifier (non-linear) to the VAR Comparator. To assure proper operation, acalibration circuit is provided to set up the proper levels of operation for a wide range of inputcurrent levels.

2-3. OUTPUT CIRCUITRYThe output amplifier produces either positive or negative signals to drive the regulator or exciter (asrequired). The polarity of this signal is determined by the appropriate jumpering of the A-B PolarityFanning Terminal Strip.

2-4. OVER-EXCITATION LIMITINGa. Over-excitation limiting provides an initial fast acting limit of the field current at a pre-selectedhigh level (allowing for motor-starting, fault clearing, etc.). After a set period of time (0 to 60 sec-onds), the limit will drop to a lower level to prevent field overheating.

b. The dc current output of the exciter or regulator will pass through a winding of the dc transduc-er (T3). The ac output of T3 will always be proportional to the input. This ac output is rectified,adjusted, and applied to the Inverse Timer.

c. If an inverse time characteristic is desired, the Inverse Time Adjustment is set for the desiredtime and the Fixed Time Adjustment is set fully counter-clockwise (CCW) to zero time. Figure 2-2illustrates the inverse time characteristics for three different settings of the Inverse Time Adjustment(fully CW, Mid-Range, and fully CCW).

d. If fixed time characteristic is desired or required, the Inverse Timer is set fully CCW to zerotime, while the Fixed Timer is set to the desired time. After the selected timer has timed out, thefield current becomes limited at the delayed threshold limit.

2-5. RELAY AND INDICATORSa. When the under-excitation portion is functioning, the Under-Excitation Detector will illuminatea green LED on the printed circuit board and energize relay K1. Relay KTs form C contacts areconnected across terminals 10, 11, and 12.

b. When the over-excitation portion is functioning, the Over-Excitation Detector will illuminate ared LED on the printed circuit board and energize relay K2. Relay K2's form C contacts are con-nected across terminals 20, 21, and 22.

2-2

Figure 2-2. Inverse Time Characteristic Curves.

2-3

SECTION 3

CONTROLS AND INDICATORS

3-1. CONTROLSFor the controls and their functions, refer to Figure 3-1 and Table 3-1.

Table 3-1. Controls.

FunctionControl

Used to calibrate the KVAR signal.

Used to adjust the Delayed Limiter threshold current (Field CurrentCalibration).Used to adjust the Instant Limiter threshold current.

Used to adjust the Inverse Timer.Used to adjust the Fixed Timer.

Potentiometer R1:Potentiometer R32:

Potentiometer R33:

Potentiometer R36:

Potentiometer R40:

TB 3

CURVE POLARITYSELECT PANNING

STRIP

R 1

R 32R 33

R 40ODS4

ODS3

ODS2QDS1

R 36

TB 4 D 2693-1909- 26-97

Figure 3-1. Controls and Indicators.

3-1

3-2. INDICATORSFor the indicators and their functions, refer to Figure 3-1 and Table 3-2.

Table 3-2. Indicators.

FunctionIndicator

Illuminates to indicate an under-excitation condition exists.LED DS1 (Green):

LED DS2 (Red):

LED DS3 (Yellow):LED DS4 (Orange):

Illuminates to indicate an over-excitation condition exists.

Illuminates to indicate that the Timers are activated.Illuminates to indicate that the leading kVAR curves are calibrated.

3-2

SECTION 4

INSTALLATION ANDCALIBRATION

4-1. MOUNTINGThe EL 200 Excitation Limiter should be mounted in a vertical position for maximum convectioncooling. Refer to Figure 4-1 for mounting holes and dimensions.

0.26 (7) HOLE ( 4 PLACES)*"5 O

10.25( 260)

10.8O( 275)O

O11 , 5

( 292)® ® ® ® ® ® ® ®

n ^ N3 NJ t'O° O -* hO o — r-o® ® °® ® O

o ® ® ® ® ® ® ®®Q ® ® ® ® ® ® ® ®fiviD2693-20

09- 26-97 /m m m-n~n mNO IOJ Ld Lri /f>) 4i-o4.2 j( 107 1.7 5.0 0.34(127)8.2 (208)

( 43) (9)

Figure 4-1. Outline Drawing.

4-2. INTERCONNECTIONConnect the EL 200 Excitation Limiter and other equipment in accordance with either Figure 4-2,4-3, 4-4, 4-5, 4-6, 4-7, 4-8, 4-9, or 4-10 as applicable.

4-1

I 1

IA

5A I B - TO LOADn im(Q CcCD 52 I

PT1 I IroFIELD rv^r^r\ rv~y~v^ PT2CO fY~VY"^73

i><o0)

IQCD

73 FI F2CD

(Q TB2 10P- c UNDEREXCITATION

F+ F- 2 11ro Q)

TB12o 12E1A E1 E33 20OVERE3CD INTERNAL SENSING

TRANSFORMERCONNECTIONS MUST

CORRESPOND TO PT2SECONDARY VOLTAGE

21 EXCITATION175 OHMSo3o 22343 L TB 4CD

C~ IB'o 6 CW

o 73 EL200 D2693-2109-26-97SR 4A OR SR8AO

G)(Q

NOTES:1. SEE REGULATOR MANUAL FOR 3-PHASE SENSING2. A-B-C ROTATION SHOWN. FOR A-C-B ROTATION, REVERSE CONNECTIONS TO TERMINALS 1 k 2

ON THE EL200 AND THE REGULATOR.3. WHEN CONNECTING ADDITIONAL BASLER EQUIPMENT, CONTACT FACTORY FOR PROPER WIRING.

4. REGULATOR SHUTDOWN SWITCH. SEE REGULATOR MANUAL.

5. CONNECT VOLTAGE INPUT TO PROPER TAP TO MATCH PT2 SECONDARY VOLTAGE.

0)

3

-nm

5Ac- TO LOAD•nGENCD

4̂CO I— CC/>

52 I73PT1 I Im

rv~v~vx rv^YAFIELDry^v~v~\

PT2O)73

A >"nCO73iI<o

F1 F203IQ TB2 104*. CD UNDER

EXCITATION1F+ F-i

112co 73 XLTB1CD 2 12<Q E1c E1 E3 2003OVERE3INTERNAL SENSING

TRANSFORMERCONNECTIONS MUST

CORRESPOND TO PT2SECONDARY VOLTAGE

o 21 EXCITATION500 OHMS</> 3 223 4 L TB 4CD- TB17o CWo

3 6 EL200 D2693-2209-26-97

3SR-E, SR-F. SR-HCD

O

O NOTES:1. SEE REGULATOR MANUAL FOR 3-PHASE SENSING2. A-B-C ROTATION SHOWN. FOR A-C-B ROTATION, REVERSE CONNECTIONS TO TERMINALS 1 & 2

ON THE EL200 AND THE REGULATOR.3. WHEN CONNECTING ADDITIONAL BASLER EQUIPMENT, CONTACT FACTORY FOR PROPER WIRING.

4. REGULATOR SHUTDOWN SWITCH. SEE REGULATOR MANUAL.

5. CONNECT VOLTAGE INPUT TO PROPER TAP TO MATCH PT2 SECONDARY VOLTAGE.

3o03

IQ

033

1

0 A5A TOGENERATOR B

LOAD-nCIQ

C

PT1 PT2CD 524̂ L —4*FIELDX rTTY^l

73rooo

3 "(D Xo *roo o3 o3 ro F+ F- F1 F20 -o4̂ - 0) 1033* 3 UNDER

EXCITATIONO Q. 11« >—23 5 %x2 70a? ro

(D O3 O0) CO

1 2E1 El4 4 E3 204 OVER

21L EXCITATION513 < c 22o 60) XRIQCD

EL20073D2693-2309-26-97

CD cwmc 6 1A 5A C0)

APM 20001000 OHMSoNOTES: A</>

1 . A-B-C ROTATION SHOWN. FOR A-C-B ROTATION, REVERSE CONNECTIONS TO TERMINALS 1 & 2ON EL 200 AND APM 2000.

2. VOLTAGE SENSING TAPS ON XR AND EL 200 MUST CORRESPOND TO SECONDARY VOLTAGE OF PT2.

3. WHEN CONNECTING ADDITIONAL BASLER EQUIPMENT, CONTACT FACTORY FOR PROPER WIRING.4. REGULATOR SHUTDOWN SWITCH. SEE REGULATOR MANUAL.

1

ATO5AGENERATOR Bn LOADin cc

ooCD PT1 PT2 52L — _lcn v̂ A-_A_A_J

7; FIELD rYTY^73 rv r̂v^TI<O

0)COCD73(P

CO F+ F- F 1 F2con QJ 3 1 10

UNDEREXCITATION

o 114 23 12El E1CD

E3 E3 20CTo OVERo21L EXCITATION3

3 500 CCP 227 OHMSocw6KRO

3

EL200o c * 2 4 02693-2409-26-97

fi)coAPM 300

*A AQ)

3 NOTES:1. A-B-C ROTATION SHOWN. FOR A-C-B ROTATION, REVERSE CONNECTIONS TO TERMINALS 1 & 2

ON EL 200 AND APM 300.2. VOLTAGE SENSING TAPS ON KR AND EL 200 MUST CORRESPOND TO SECONDARY VOLTAGE OF PT2.3. WHEN CONNECTING ADDITIONAL BASLER EQUIPMENT, CONTACT FACTORY FOR PROPER WIRING.4. REGULATOR SHUTDOWN SWITCH. SEE REGULATOR MANUAL.

AI5A

BGEN •n - TO LOAD"TI(2 cCCD \4*. No>

FIELD0)

73<oa>

<2CD

73CD FI F2(2C4̂ TB21 10ID<T> UNDER

EXCITATIONF+ F- 2o

TB12 12El3ElCD E3 20

OVERo E2o 21 EXCITATION3 E33 22(DO

L TB 4o TB124 C3

o 23 EL200SSR D2693-2509-26-97

2(2

CD3 NOTES:

1 . SEE REGULATOR MANUAL FOR 3-PHASE SENSING2. A-B-C ROTATION SHOWN. FOR A-C-B ROTATION, REVERSE CONNECTIONS TO TERMINALS 1 & 2

ON THE EL200 AND THE REGULATOR.

3. WHEN CONNECTING ADDITIONAL BASLER EQUIPMENT, CONTACT FACTORY FOR PROPER WIRING.4. CONNECT VOLTAGE INPUT TO PROPER TAP TO MATCH GENERATOR OUTPUT VOLTAGE.

GENERATOR I

>—s

i 1

An5A TO(Q Bc LOADc0

o ©p- 52PT1 PT2 p*̂ _ PT3"4 I L I

FIELD T10 V_A_A_A_V V_A_A^AVAAAAAAA^0) prrrv-©3" r^rv~y~\ry~y-y~\^ry~v~> rYYYVYYY^ rYYYYYYY^ u±u uc II

3

c/>0)

nmxn0w -i 10F- F4 PI P2 P3o>C/> P> 125 VDCC/> 12N

3* m4*> oI RECTIFIER CHASSIS9 1079 01 XXX

9°^4 £»O C/>o m G1 K 1 C2 K2 G3 K3 CH A B C R1 R 2> 73

i

O F3 F 4K! G2 K 2 G3 K3 CH A B C R1 R 2G100106 I- 21( 2

UNDEREXCITATION23 CONTROL CHASSIS

9 1079 02 XXX7

El0 B1 220E3O B2 El £ OVERO 21B3 EXCITATIONE23 22C3 C3 E30 EL 200C2 Xo

Cl COD2693-2609-26-97O

3NOTES:o

1. SSE INTERNAL SENSING TRANSFORMER CONNECTIONS MUST CORRESPOND WITH PT1 AND PT2 SECONDARY VOLTAGE.2. A-B-C ROTATION SHOWN.3. EXCITATION LIMITING NOT OPERATIVE IN MANUAL4. EXTERNAL TRANSDUCER REQUIRED.5. REFER TO SSE MANUAL FOR CONTROL CONNECTIONS.6. CONNECT EL200 TERMINAL E 3 CONNECTIONS TO PROPER TAP (PT3 SECONDARY VOLTAGE).7. WHEN CONNECTING ADDITIONAL BASLER EQUIPMENT, CONTACT THE FACTORY FOR PROPER WIRING.

IQ

A)

3

|GENERATOR Iv /

r- — n

AT15A TOIQ Bc LOADry~y~y~\

c(D4 14̂ 52PT1 PT2 p^_ PT300 r< i L I

FIELD T10 V_>V_A_A_^in -AAA-A -̂AA, LA A A V̂A-/ T UAAAAAA^

rV~Y'^~V#_

#.3" r r̂y~^\ ry~v~Y~\r~Y~Y~v~y-v~Y-v~\ ry~y~Y~V^V~Y^O> ^V^V~V~V-V~V~>̂ u±u uc 4 »3 I>

C/>a>

4 »o4 »m UvUJXorw~Y~\

4^ fDO -» o i *

F- F+ PI P2 P3 10oCO p> 125 VDCCO N 12

* mo RECTIFIER CHASSIS9 1079 01 XXX

P®oo2 coo m G1 |K1 |C2 |K? |G3 |K3 |CH [ A B C |R1 R 2o

7J> O F3 F4K 1 G2 K2 G3 |K3 CH A B C Rl R2CD G1I06

I2

UNDEREXCITATION23 CONTROL CHASSIS

9 1079 02 XXX7 1

El<D Bl 220E3O B2 E1 OVERo 21B3 EXCITATIONE23 22C3 C3 E 3fD EL 200C2o X

Cl D2693-2709-26-97

COo3

NOTES:O

1. SSE INTERNAL SENSING TRANSFORMER CONNECTIONS MUST CORRESPOND WITH PT1 AND PT2 SECONDARY VOLTAGE.2. A-B-C ROTATION SHOWN.3. EXCITATION LIMITING NOT OPERATIVE IN MANUAL4. EXTERNAL TRANSDUCER REQUIRED.5. REFER TO SSE MANUAL FOR CONTROL CONNECTIONS.6. CONNECT EL200 TERMINAL E 3 CONNECTIONS TO PROPER TAP (PT3 SECONDARY VOLTAGE).7. WHEN CONNECTING ADDITIONAL BASLER EQUIPMENT, CONTACT THE FACTORY FOR PROPER WIRING.

0)

CDQ)

3

DC XDUCERBE 15681 001400-800 ADC

RECTIFIERCHASSIS

F-F-D2639-2809-30-97

E1

A - SEE *NOTE"7SEE *NOTE/

E3

0 24 48

BE 01315 001rVA

2 o ooo o00o <N 'sf CO

F3 F4

EL 200-79 1747 00 110

* NOTE: TO EXTEND RANGE TO 800-1000 ADC, OPENAT "A" AND CONNECT 120 VAC AT E1-E3 (USUALLY SENSINGVOLTAGE IS AVAILABLE AT 120 VAC)

Figure 4-9. Interconnection Diagram For EL200-7, DC Transducer (400-800 Adc and 800-1000 Adc), and Auxiliary Transformer.

4-9

DC XDUCERBE 21279 001

1300-3000 ADC

RECTIFIERCHASSIS

F-F-D2693-2909-30-91

TRANSFORMER ASSY.

9 2407 06 100

El120 VAC -

E3

E3 F4

EL 2009 1747 00 110

Figure 4-10. Interconnection Diagram For EL200-7, DC Transducer (1300-3000 Adc), andAuxiliary Transformer.

4-10

4-3. PRELIMINARY SET-UPTo prepare the EL 200 Excitation Limiter for calibration, proceed as follows:

Set the KVAR Adjust potentiometer (R1) fully clockwise.a.

Set the Delayed Current Limiter Threshold Adjust Potentiometer (R32) fully clockwise.b.

Set the Instant Current Limiter Threshold Adjust potentiometer (R33) fully clockwise.c.

Set the Inverse Timer Adjust potentiometer (R36) fully counter-clockwise.d.

Set the Fixed Timer Adjust potentiometer (R40) fully counter-clockwise.e.

Connect the curve selecting jumper from terminal TS3-4 to terminal TS3-1, TS3-2, orTS3-3 depending on the desired leading kVAR curve (refer to Figure 4-11).

f.

Figure 4-11. Leading kVAR Curves.

Place the polarity fanning strip (TB3) in either the A or B position depending on thepolarity required by the voltage regulator. (Refer to Table 4-1).

g-

4-11

Table 4-1. Fanning Strip (TB3) Selection.

Position BPosition A

SER-CBSBSRN

SR-ESR-ASR-HXR2001

XR2002 KR-FSSEXR2003

SSR

NOTE

When using the SPM 2000 sensing module with any XR series volt-age regulator, consult with the factory.

Tag and disconnect the leads from terminals TB1-L and TB1-C.h.

Tie the leads together.i.

Start the generator and parallel to the bus in the normal manner. Test for normaloperation.

Rotate the voltage regulator/exciter Voltage Adjust rheostat clockwise to increase fieldexcitation.

j-

k.

Lagging kVAR should flow from the generator into the bus. Field current fromTB2-F1 of the EL 200 or through the primary of the external transducer shouldincrease.

Result:

Rotate the voltage regulator/exciter Voltage Adjust rheostat counter-clockwise to de-crease field excitation.

Leading kVAR should flow from the generator into the bus. Field current fromTB2-F1 of the EL 200 or through the primary of the external transducer shoulddecrease.

Result:

Check that the governor can be adjusted to produce any amount of kW between zeroand rated.

m.

If operation is normal, unparallel and then shutdown the generator.n.

Reconnect the wires to terminals TB1-L and TB1-C per the tagged identification.o.

4-12

4-4. OVER-EXCITATION CALIBRATION

NOTE

If a runaway event occurs during the following test, it is probably :caused by either a reversed polarity of the A-B fanning strip, or re-versed connections at terminals TB1-L and TB1-C.

a. Delayed Current Limit (Field Current) Calibration. The following procedure will set the maxi-mum continuous allowable field current and is performed as follows:

To avoid stressing the generator system, the calibration procedure in this paragraphand that contained in sub-paragraph b. tests the limiting action at field current levelsless than those generally selected for delayed current limiting and instant current limit-ing. In the final steps of each procedure, potentiometer adjustments are performed toshift the thresholds to the selected levels.

(1)

Begin the calibration by selecting a field current level for testing that is approximatelyequal to the full-load field current. Divide the test current level by the current levelselected for delayed current limiting.

(2)

EXAMPLE:

Chosen Test Current Level 5A 0.714Selected Delayed Current Level 7A

With R32 fully clockwise, parallel the generator with the bus and set it for 10% of ratedkW output.

(3)

Set the voltage regulator's voltage adjust until the field current is equal to the testcurrent chosen in step (2).

(4)

CAUTION

Continuously monitor the generator system to ensure that the sys-tem is not overstressed.

Rotate R32 counterclockwise until indicator DS3 (yellow) illuminates. Continue turningR32 until indicator DS2 (red) is illuminated and the field current just begins todecrease.

(5)

Measure the dc voltage at TP1 with respect to TB4-C.(6)

4-13

Multiply the voltage measured in step (6) by the percentage calculated in step (2).(7)

EXAMPLE:

4.8 V X 0.714 = 3.43 V

While maintaining the field current at the test level, rotate potentiometer R32 clockwiseuntil the dc voltage at TP1 is the value calculated in step (7).

(8)

b. Instant Current Limit Calibration. This procedure will set the maximum instantaneous fieldforcing current and is performed as follows:

Calibrate the delayed current limiter first (sub-paragraph a. above).(1)

Divide the value of the desired delayed current limit (sub-paragraph a., step (2) above)by the desired instant current limit.

(2)

EXAMPLE:Selected Delayed Current LimitDesired Instant Current Limit

7A 0.710A

(3) Multiply the answer found in the previous step (step (2)) by 0.9.

EXAMPLE:

0.7 X 0.9 = 0.63

With the field current at the test current level, measure the voltage between TP1 andTB4-C.

(4)

EXAMPLE:

3.43 V

Multiply the voltage measured in the previous step (step (4)) by the value found in sub-paragraph b., step (3).

(5)

EXAMPLE:

3.43 X 0.63 2.16 V

With the field still at the test level, adjust R33 such that the voltage measured betweenTP2 and TB4-C is equal to that calculated in the previous step (step (5)).

(6)

4-14

c. Final Timer Setting.

If a Fixed Timer characteristic is desired, set potentiometer R36 counter-clockwise, andthen set potentiometer R40 to the desired time. Potentiometer R40 provides anincreasing delay factor when rotated in a clockwise direction.

(1)

If an Inverse Timer characteristic is desired, set potentiometer R40 fully counter-clock-wise, and then set potentiometer R36 clockwise for the desired time delay. RotatingR40 clockwise will increase the time delay.

(2)

4-5. UNDER-EXCITATION CALIBRATION

NOTE

If a runaway event occurs during the following test, it is probably :caused by either a reversed polarity of the A-B fanning strip, or re-versed connections at terminals TB1-L and TB1-C.

If the generator is capable of operating at full-rated kW load, the preferred calibration procedure isgiven in sub-paragraph a. below. If the generator must be operated at less than full-rated kW (25%minimum), perform the calibration procedure given in sub-paragraph b. below.

a. Full-Rated kW Calibration Procedure. To calibrate the Excitation Limiter under-excitation(minimum) circuitry when full-rated kW loading is possible, proceed as follows:

With the generator paralleled and the Excitation Limiter calibrated for over-excitation(maximum), adjust the voltage regulator Voltage Adjust rheostat for zero kVARs.

d)

Adjust the governor for rated kW.(2)

Adjust the Excitation Limiter potentiometer R1 until DS4 (orange) just illuminates.(3)

Adjust the governor for about 10% kW.(4)

Rotate the voltage regulator Voltage Adjust rheostat in the direction of leading kVARoutput until indicator DS1 (green) just illuminates. Further movement of the VoltageAdjust rheostat should produce no further increase of leading kVAR flow. If the leadingkVARs are not at the desired value, shutdown the system and select a different curve.Repeat the entire procedure.

(5)

b. Less Than Full-Rated kW Calibration Procedure. To calibrate the Excitation Limiter under-excitation (minimum) circuitry when less than full-rated kW loading is possible, proceed as follows:

With the generator paralleled and the Excitation Limiter calibrated for over-excitation(maximum), adjust the voltage regulator Voltage Adjust rheostat for zero kVARs orslightly lagging.

(1)

Connect the positive lead of a digital dc voltmeter to bottom of R9 (opposite side ofTP3). Connect the negative lead to terminal C.

(2)

4-15

(3) Apply a 25% to 100% kW load to the generator.

EXAMPLE:

25% kW, 1 pf (unity)

(4) Adjust the KVAR CAL (potentiometer R1) until indicator DS4 (orange) illuminates.

Measure and record the negative voltage indicated on the digital voltmeter.(5)

EXAMPLE:

Meter reads -1.3 Vdc

(6) Multiply the percentage of load from step (3) by the voltage recorded in step (5).

EXAMPLE:

25% X -1.3 V -0.325 Vdc

(7) Adjust potentiometer R1 until the digital dc voltmeter indicates the voltage calculatedin step (6).

EXAMPLE:

Meter reads -0.325 Vdc

(8) Adjust the generator for about 10% kW.

(9) Rotate the voltage regulator Voltage Adjust rheostat in the direction of leading kVARoutput until indicator DS1 (green) just illuminates. Further movement of the VoltageAdjust rheostat should produce no further increase of leading kVAR flow. If the leadingkVARs are not at the desired value, shutdown the system and select a different curve.Repeat the entire procedure.

4-6. MOTOR CALIBRATION AND OPERATIONThe Minimum/Maximum Excitation Limiter (EL 200) can be used with synchronous motors andcondensers provided special precautions are taken. The EL 200 requires a special calibrationprocedure to ensure proper operation with synchronous motors. The following calibration andoperation procedures must be carefully followed. Failure to do so may result in damage to themotor.

4-16

a. Calibration (Refer to Figure 4-12). Calibration can be accomplished by connecting the EL200as shown in Figure 4-12. (The difference between Figures 4-12 and 4-13 is the CT connections tothe EL 200. Be sure to follow the interconnects exactly.) The contact across Terminals 1 and 2(EL 200) disable the minimum excitation limit operation during the starting and synchronization ofthe motor. Without this contact, the EL 200 will experience both a minimum and maximum limitsimultaneously. With the contact closed, the limiter can still react to and limit a maximum excitationcondition. Once the motor has synchronized, this contact will open.

CT1SYNCMOTOR

STARTER+ BUS

FIELDrY'VVN LA_A

/'VV'Y-\ rvw^PT1 PT2

F- F+

3

A A 4

SR-AREGULATOR A1

F3 F42 1

INTERNAL SENSINGTRANSFORMERCONNECTIONS MUSTCORRESPOND TOPT2 SECONDARYVOLTAGE

2EL 200

E1E1

E3 120

240E3

480

60C175

CWL6

7 C D2693-3109-26-97

A SEE REGULATOR MANUAL FOR 3-PHASE SENSING

FOR A-C-B ROTATION, REVERSE CONNECTIONS TO TERMINALSA-B-C ROTATION SHOWN.1 & 2 ON THE EL 200 AND SR- A REGULATOR.

2.

A CONTACTS OPEN AFTER MOTOR HAS SYNCHRONIZED.

/4\ FOR REGULATORS OTHER THAN SR-A’S SEE THEIR RESPECTIVE GENERATOR INTERCONNECTAND ADD THE CONTACT ACROSS EL200 TERMINALS 1 AND 2.

Figure 4-12. EL 200 and Motor Calibration Interconnection Diagram.

(1) Start the motor.

Connect the positive lead of a digital dc voltmeter to TP3 (junction of R9 and R10) onthe EL 200 printed circuit board. Connect the negative lead to Terminal C of the EL200.

(2)

4-17

Once the motor has been synchronized and the contact across Terminals 1 and 2 ofthe EL 200 has opened, apply a 25 to 100% load (slightly leading).

(3)

EXAMPLE:

25% Load

(4) Adjust the KVAR CAL (potentiometer R1) until DS4 (orange) illuminates.

Measure and record the negative voltage indicated on the digital voltmeter.(5)

EXAMPLE:

Meter reads = -1.3 Vdc

(6) Multiply the percentage of load from Step (3) by the voltage recorded in Step (5).

EXAMPLE:

25% X -1.3 V = -0.325 Vdc

(7) Adjust potentiometer R1 until the digital dc voltmeter indicates the voltage calculatedin Step (6).

EXAMPLE:

Meter reads -0.325 Vdc

This concludes the calibration.(8)

b. Operation (Refer to Figure 4-13). Operation can now be made using the interconnectionshown in Figure 4-13. As before, the contacts across the EL 200 Terminals 1 and 2 disable theminimum excitation limit during motor starting. This prevents the possibility of both a minimum andmaximum limit condition occuring during motor start (inrush current and maximum field currentoccuring simultaneously). The limiter will still react to and limit a maximum excitation conditionduring motor start. Once the motor has synchronized, the contact across the line current input(Terminals 1 and 2) opens and the limiter will now react to both maximum and minimum excitationconditions.

4-18

CT1SYNCMOTOR

STARTER BUS

FIELDrY-v^o --- A A .

fTYVA rv-VY-N

PT2PT 1

F- F+

3

4

SR-AREGULATOR 1

F3 F42INTERNAL SENSING

TRANSFORMERCONNECTIONS MUSTCORRESPOND TOPT2 SECONDARYVOLTAGE

2EL 200

E1E1

E3 120

240E3

480X 60C

6 L

C7 D2693-3209-26-97

A SEE REGULATOR MANUAL FOR 3-PHASE SENSING

FOR A-C-B ROTATION, REVERSE CONNECTIONS TO TERMINALSA-B-C ROTATION SHOWN.1 & 2 ON THE EL 200 AND SR- A REGULATOR.2.

A CONTACTS OPEN AFTER MOTOR HAS SYNCHRONIZED.

A FOR REGULATORS OTHER THAN SR-A'S SEE THEIR RESPECTIVE GENERATOR INTERCONNECTAND ADD THE CONTACT ACROSS EL 200 TERMINALS 1 AND 2.

Figure 4-13. EL 200 and Motor Operation Interconnection Diagram.

4-19

SECTION 5

MAINTENANCE INSTRUCTIONS

5-1. PREVENTIVE MAINTENANCEPeriodic inspections of the EL 200 Excitation Limiter should be made on a regular basis to ensurethat the unit is clean and free from accumulations of dust and moisture. When inspecting the unit,check that all parts are securely mounted and that all electrical connections are clean and secure.

5-2. CORRECTIVE MAINTENANCEIf a malfunction is detected in the system, use the troubleshooting table in paragraph 5-3. Repairis limited to the replacement of those parts listed in Table 5-2.

5-3. TROUBLESHOOTINGThe more common malfunctions and their appropriate repair procedures are listed in Table 5-1.

Table 5-1. Troubleshooting Chart.

MALFUNCTIONTEST OR INSPECTION

CORRECTIVE ACTION

1. EL 200 EXCITATION LIMITER CAUSES AVR TO GO TO MAXIMUM OUTPUT.

Step 1. Check the fanning strip (TB3) for proper polarity connection per Table 4-1.

If the polarity is incorrect, reconnect the polarity jumper on the fanning strip.

If the polarity is correct, proceed to step 2.

Step 2. Check for the proper voltage input phasing and connections at terminals TB1-E1 andTB1-E3 per Figures 4-2 through 4-8.

If the voltage input is reversed or improperly connected, reconnect properly.

If the voltage input is connected properly, replace the EL 200 printed circuit board.

2. ORANGE KVAR LIGHT (DS4) WILL NOT TURN ON WHEN CALIBRATING MINIMUMEXCITATION LIMITER FOR 100% kW.Check for proper connection of the current sensing transformer (CT) to TB1-1 and TB1-2 inaccordance with Figures 4-2 through 4-8.

If the current sensing transformer (CT) is connected improperly, or if the leads arereversed, reconnect the transformer properly.

5-1

Table 5-1. Troubleshooting Chart - Continued.

MALFUNCTIONTEST OR INSPECTION

CORRECTIVE ACTION

3. THE EL 200 DOES NOT MATCH THE GENERATOR CAPABILITY CURVE.

Check that the EL 200 is jumpered (TB3) for the correct curve (Figure 4-9) in accordance withparagraph 4-3f.

If the EL 200 is not jumpered properly, reconnect the jumper per paragraph 4-3f. andthen recalibrate per paragraphs 4-4 and 4-5.

4. THE SYSTEM BECOMES UNSTABLE WHEN THE EXCITATION LIMIT IS ATTAINED.

Adjust the voltage regulator Stability potentiometer(s) for maximum stability per the voltageregulator instruction manual.

5. MAXIMUM EXCITATION LIMITER DOES NOT TRIP THE DELAY LIMIT OR THEINSTANTANEOUS LIMIT.

Recalibrate the unit per paragraph 4-4.

6. SYNCHRONOUS MOTOR OPERATION APPEARS FAULTY.

Step 1. Check that the contacts across Terminals 1 and 2 (EL 200) are closed during motorstart and open after the motor is synchronized.

If contacts are not operating as specified, repair contacts/wiring as required.

If contacts are operating as specified, proceed to Step 2.

Step 2. Verify that all connections (especially the CT) are proper per the interconnection dia-

grams.

If all wiring connections are proper, re-calibrate the EL 200.

If the above steps fail to correct the problem, replace the EL 200 printed circuit board.

5-4. REPLACEMENT PARTSThe following list (Table 5-2) describes the only assembly of the EL 200 Excitation Limiter that hasmaintenance significance. When ordering any part from Basler Electric Company, always specifythe description of the item, the part number, and the quantity required.

Table 5-2. Replacement Part List.DescriptionBasler Part Number Qty

Printed Circuit Board9 1747 01 102 1

5-2

Basler ElectricP.O. BOX 269, HIGHLAND, ILLINOIS 62249, U.S.A. PHONE 618-654-2341 FAX 618-654-2351