3500 galvanic isolator

Part number 141706-01Revision NC, August 1999

3500 Galvanic IsolatorInterface

Manual

3500 Galvanic Isolator Interface Manual

ii

Copyright © 1999 Bently Nevada CorporationAll Rights Reserved.

The information contained in this document is subject to change without notice.

The following are trademarks of Bently Nevada Corporation in the United States and othercountries:

Actionable Information™, Actionable Information to theRight People at The Right Time™, ADRE®, BentlyNevada®, CableLoc™, Data Manager®, DecisionSupport™, DemoNet™, Dynamic Data Manager®,Dynamic Transmitor™, Engineer Assist™,FieldMonitor™, FluidLoc™, FlexiTIM™, FlexiTAM™,Helping you Protect and Manage All Your Machinery®,HydroVU™, Key ∅ ®, Keyphasor®, Machine ConditionManager™ 2000, MachineLibrary™, MicroPROX®,Move Data, Not People™, Move Information, NotData™, Performance Manager™, PROXPAC®,Proximitor®, REBAM®, Seismoprobe®, System 1™,TDIXconnX™, Tecknowledgy™, TipLoc™,TorXimitor®, Transient Data Manager®,Trendmaster®, TrimLoc™, VAM™, Velomitor®,Xlerometer™

The Bently Nevada Corporation Orbit Design is atrademark of Bently Nevada Corporation in the UnitedStates and other countries.

The following ways of contacting Bently Nevada Corporation are provided for those timeswhen you cannot contact your local Bently Nevada representative:

Mailing Address 1617 Water StreetMinden, NV 89423USA

Telephone 1 775 782 36111 800 227 5514

Fax 1 775 782 9259Internet www.bently.com

http://www.bently.com/

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Additional Information

Notice:This manual does not contain all the information required to operate and maintain the3500 Galvanic Isolator Interface. Refer to the Following manuals for other requiredinformation.

3500 Monitoring System Rack Installation and Maintenance Manual (129766-01)

• general description of a standard system

• general description of a Triple Modular redundant (TMR) system

• instructions for installing the removing the module from a 3500 rack

• drawings for all cables used in the 3500 Monitoring System

3500 Monitoring System Rack Configuration and Utilities Guide (129777-01)

• guidelines for using the 3500 Rack Configuration software for setting the operatingparameters of the module

• Guidelines for using the 3500 test utilities to verify that the input and output terminals onthe module are operating properly

3500 Monitoring system Computer Hardware and Software Manual (128158-01)

• instructions for connecting the rack to 3500 host computer

• procedures for verifying communication

• procedures for installing software

• guidelines for using Data Acquisition / DDE Server and Operator Display Software

• procedures and diagrams for setting up network and remote communications

3500 Field Wiring Diagram Package (130432-01)

• diagrams that show how to hook up a particular transducer

• lists of recommended wiring


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Contents

1. Receiving and Handling Instructions ........................................11.1 Receiving Inspecting .........................................................................................11.2 Handling and Storage Considerations ...............................................................11.3 Disposal Statement ...........................................................................................1

2. General Information ....................................................................22.1 The Parts of the Interface System .....................................................................3

3. Installing the Hardware...............................................................53.1 Before You Begin ..............................................................................................5

3.1.1 Verifying that the Installation will Meet Approval Requirements ..........53.1.2 Checking the Accuracy of the Output Signal.......................................5

3.2 Installing Backplane Hardware ..........................................................................63.2.1 Installing the Vibration Transducer Interface Modules ........................73.2.2 Installing the Hazardous-area Screw Clamp Connector......................73.2.3 Connecting the Power Supplies..........................................................83.2.4 Installing the Earth Rail.......................................................................93.2.5 Installing the Backplane....................................................................113.2.6 Installing the Backplane onto a Surface............................................113.2.7 Installing the Backplane onto a DIN-rail ............................................113.2.8 Installing the Backplane into an Enclosure .......................................13

3.3 Backplane Dimensions (Vibration)...................................................................153.4 Backplane Dimensions (Keyphasor)................................................................15

4. Wiring the Hardware .................................................................164.1 Location of Terminals on the Vibration Transducer Interface Module ..............174.2 Location of Terminals on the Backplane..........................................................18

4.2.1 Vibration Backplane..........................................................................184.2.2 Keyphasor Backplane.......................................................................19

4.3 Connecting Single or Redundant Power Supplies in a Ring Main System .......194.4 Precautions about Connecting the Screw Clamp Connectors..........................224.5 Connecting Cable Assemblies to Backplanes..................................................23

4.5.1 Cable Pin Outs .................................................................................254.6 Connecting Special Alarm Inhibits ...................................................................284.7 Configuring the 3500 Monitoring System.........................................................28

5. Maintenance and Troubleshooting ..........................................295.1 Maintenance....................................................................................................295.2 Troubleshooting...............................................................................................30

5.2.1 Bench Testing Isolators ....................................................................315.2.2 Replacing Faulty Isolators ................................................................32

Section 1 — Receiving and Handling Instructions

1

1. Receiving and Handling Instructions

1.1 Receiving InspectingThe Bently Nevada 3500 Galvanic Isolator Interface module is shipped withVibration Transducer Interface modules installed on the backplane and in theenclosure or as separate units depending on ordering information. Carefullyremove all equipment from the shipping containers and inspect the equipment forshipping damage. If damage is apparent, file a claim with the carrier and submita copy to Bently Nevada Corporation. Include part numbers and serial numberson all correspondence. If no damage is apparent and the equipment is not goingto be used immediately, return the equipment to the shipping containers andreseal until ready for use.

1.2 Handling and Storage ConsiderationsStore the 3500 Galvanic Isolator Interface module and any other Bently Nevadaequipment in an environment free from potentially damaging conditions such ashigh temperature, excessive humidity, or a corrosive atmosphere.

Circuit boards contain devices that are susceptible to damage when exposed toelectrostatic discharge. Damage caused by obvious mishandling of the board willvoid the warranty. To avoid damage, observe the following precautions in theorder given.

! Do not discharge static electricity onto the circuit board. Avoid tools orprocedures that would subject the circuit board to static damage. Somepossible causes include ungrounded soldering irons, nonconductive plasticsand similar materials.

! Personnel must be grounded with a suitable grounding strap (such as 3MVelostat No. 2060) before handling or maintaining a printed circuit board.

! Transport and store circuit boards in electrically conductive bags or foil.

Use extra caution during dry weather. Relative humidity less than 30% tends tomultiply the accumulation of static charges on a surface.

1.3 Disposal StatementCustomers and third parties that are in control of product at the end of its life orat the end of its use are solely responsible for proper disposal of product. Noperson, firm, corporation, association or agency that is in control of product shalldispose of it in a manner that is in violation of United States state laws, UnitedStates federal laws, or any applicable international law. Bently NevadaCorporation is not responsible for disposal of product at the end of its life or atthe end of its use.


2

2. General InformationThis section describes the Bently Nevada 3500 Galvanic Isolator Interfacesystem and lists the Bently Nevada 3500 Monitors and transducer systems withwhich it is designed to be used.

A Vibration Transducer Interface works in an intrinsically safe system as agalvanic isolator. This isolator acts as an interface between a transducerinstalled in a hazardous environment and a 3500 monitoring system installed in asafe environment.

Although a galvanic isolator and a zener barrier are both intrinsically safeinterfaces that provide the same level of protection, they work differently. Azener barrier works by shunting excess current and voltage to ground. Agalvanic isolator provides intrinsic safety by isolating power, ground, and signalin the hazardous area from the safe area. This isolation removes the need toprovide an earth ground in the hazardous environment. With the exception of theAeroderivative Interface Module, all transducers can "float" in the hazardousenvironment.

A drawback to using galvanic isolation instead of zener barriers is that galvanicisolation introduces a small amount of noise and signal inaccuracy to thetransducer output as listed in the data sheet at the end of this manual. This errorcan cause some concern in certain applications as described in the sectionChecking the Accuracy of the Output Signal, page 5.

The Bently Nevada 3500 Galvanic Isolator Interface can receive inputs from thefollowing approved Bently Nevada transducers:

• 3300 XL Proximitor Transducer

• 3300 5 mm/8 mm Proximitor Transducer

• 7200 5 mm/8 mm Proximitor Transducer

• Accelerometer Interface Module (part number 23733-03)

• Aeroderivative Interface Module (part number 86517) (Velocity Only)

• 3300 REBAM MicroPROX Transducer

• 7200 REBAM MicroPROX Transducer

The 3500 Galvanic Isolator Interface system can be used in thrust, DC,Keyphasor and vibration systems. The following 3500 monitors have beentested with the 3500 Galvanic Isolator Interface system:

• 3500/25 Keyphasor Monitor

• 3500/40 Proximitor Monitor

• 3500/42 Proximitor /Seismic Monitor

• 3500/44 Aeroderivative Monitor

• 3500/50 Tachometer Monitor

Note: The I/O modules of the above 3500 monitors must be ExternalTerminations.

Section 2 — General Information

3

2.1 The Parts of the Interface System

Part Part Name Function of the partVibrationTransducerInterface Module

A galvanic isolator that isolates safe-areacircuitry from hazardous-area circuitry.

Backplane(Vibration)

Backplane(Keyphasor)

A circuit board that distributes power tothe Vibration Transducer Interfacemodules and sends transducer outputsignals to the 3500 Monitoring System.The backplane is a safe-area component.

An 8-position backplane for proximity andacceleration measurements is used withthe 3500/40, 3500/42, 3500/44 and3500/50 Monitors. A 4-position backplanefor Keyphasor measurements is usedwith the 3500/25 Keyphasor Monitor.

Hazardous AreaConnector

A screw clamp connector for attachingtransducer wiring to the hazardous areaterminals at the top of the VibrationTransducer Interface module.

Interface Cables Cables that interface the backplanes tothe 3500 Monitoring System. Order theseseparately.

Earth Rail An accessory that comes with thebackplane and provides a convenientearth termination point.

Also included with the standard interface system package are a mounting kit anda manual. The mounting kit contains the following parts:

Item Qty Where Used

Pan head self tapping screw 4 DIN-rail mount

Spacer 4 DIN-rail mount

DIN-rail mounting foot 4 DIN-rail mount

Plain washer, M4 4 Surface/DIN-rail mount

Locking washer, M4 4 Surface/DIN-rail mount

Retaining Washer 4 Surface/DIN-rail mount

M4x20 screw 4 Surface mount


4

M4x10 spacer 4 Surface mount

Retaining washer, M4 4 Surface mount

Power supply Connectors 2 Power Input

An enclosure is also available with the isolator system as optional accessories.

Section 3 — Installing the Hardware

5

3. Installing the HardwareThis section shows how to install the parts of the 3500 Galvanic Interface ontothe backplane and then how to mount the backplane on a surface or in anenclosure. The next section, Wiring the Hardware, shows how to connect theinstalled interface to vibration transducers, monitors, and power supplies.

3.1 Before You Begin

Before you install the 3500 Galvanic Isolator Interface, use the following twochecklists to verify that the installation will meet approval requirements and tocheck the accuracy of the output signal.

3.1.1 Verifying that the Installation will Meet ApprovalRequirements• Make sure all installation work is carried out in accordance with all relevant

local standards, codes of practice, and site regulations.

• Check that the hazardous-area equipment complies with the descriptivesystem document.

• If you cannot verify that the system meets approval requirements, refer to thecertificate for clarification of any aspects of intrinsic safety or contact BentlyNevada or your local Bently Nevada representative for assistance.

• Refer to the General Information section for appropriate applications.

3.1.2 Checking the Accuracy of the Output SignalBefore installing a 3500 Galvanic Isolator Interface system, use the information inSection 3.1.2.1., Section 3.1.2.2. and the Specifications, to evaluate how theVibration Transducer Interface module will affect your instruments.

Note:The 3500 Galvanic Isolator Interface can introduce additional ac and dc errors.

3.1.2.1 Affects on MonitorsThe 3500 Galvanic Isolator Interface system could affect the following types ofmonitors. We recommend that you verify the vibration levels in the field after youinstall the 3500 Galvanic Isolator Interface system.

! 3500/25 Keyphasor Monitor

! 3500/40 Proximitor Monitor

! 3500/42 Proximitor /Seismic Monitor

! 3500/44 Aeroderivative Monitor

! 3500/50 Tachometer Monitor


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3.1.2.2 Affects on Diagnostic SystemsBe aware of the additional phase, gap, and vibration errors that will be present(refer to the Specification sheet at the end of this manual). The followingmeasurements are affected by the additional voltage errors:

• Shaft centerline plots are affected by the dc offset.

• Gap measurements are affected by the dc offset.

• The additional phase error could affect orbit plots. The amount of errordepends on the frequency of the vibration.

• The additional ac error will affect vibration measurements.

3.2 Installing Backplane HardwareThese procedures show how to attach Vibration Transducer Interface modules,connectors and the earth rail to the backplane. Before you begin, take note ofthe following precaution about installing components in hazardous areas:

WARNINGDo NOT install a backplane orother safe area components in ahazardous environment. Anexplosion may occur if safearea components are installedin a hazardous environment.

Install the 3500 Galvanic Isolator Interface in a safe environment unless themodules are protected by a locally acceptable explosion proof technique.


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3.2.1 Installing the Vibration Transducer Interface ModulesInstall Vibration Transducer Interface modules on the backplane (refer to the3500 Field Wiring Package (130432-01)). To install a Vibration TransducerInterface module:

1. Attach a position label (NOT supplied) where shown if necessary. The labelidentifies the location of the module onthe backplane.

2. Position the Vibration TransducerInterface module onto the appropriatesafe-area/power supply connector onthe backplane as shown and insert itonto the connector. This connects themodule to the appropriate safe-areaconnector (pins 7 and 8) and to thepower supply.

3. Tighten the two mounting screwswhere shown.

1) Position Label

2) Mounting Screw

3) Safe Area/Power Supply BaseConnector

4) Backplane

3.2.2 Installing the Hazardous-area Screw Clamp Connector1. Trim the insulation of the wire back 12 mm. The wire

should be between 16 and 22 AWG.

2. Insert the wires according to the socket assignment(see the 3500 Field Wiring). Tighten the screws of theconnector as shown.

3. Attach a tag label where shown if necessary.

4. Position the hazardous area connector over theappropriate Vibration Transducer Interface moduleand insert as shown.


8

1

3

2

4

0VV20VV1

0VV20VV1

V1

0VV20V

0VV20VV1

3

3

3

4

44

3.2.3 Connecting the Power SuppliesPower is supplied to the backplane through two power supply connectors. Toinstall the power supply connectors:

1. Connect the power supply connectors to the independent supply sources asillustrated and according to the 3500 Field Wiring Package (130432-01).Each connector can provide connection for both primary and secondarypower supplies to the backplane. Both connectors are functionally equivalentso that either or both of these connectors can be used as shown. Be awarethat the maximum wire gauge is 12 AWG (2.5 mm2).

1) Vibration Backplane

2) Keyphasor Backplane

3) Power Supply

4) Power Supply Connector

To check the power supply status:


9

1

2 3

3

Verify that at least one power supply LED is on. One LED will be on for eachpower supply that is installed.



3) Power Supply LEDs

3.2.4 Installing the Earth RailAn earth rail provides a termination point for shield and spare wires. It alsoprovides a grounding location for transducers if local wiring codes require anearth ground. Reference local wiring codes for any wiring restrictions.

The 3500 Galvanic Isolator Interface system does not require a high integrityearth and the transducers can be left floating or be earthed at any one point.Refer to the 3500 Field Wiring Package (130432-01). Do not wire transducercommon to earth. A "floating" system is recommended, except for theAeroderivative Interface Module (part number 86517) which requires a groundedsystem for noise immunity.


10

1 2

3 3

334 4

To attach the earth rail:

1. Locate the earth rail over the "C" holes of the backplane.



3) “C” Holes

4) Earth Rail Post Positions

2. Mount the earth rails to the backplanewith four M3x12 screws and washers.

1) Earth Terminal

2) Plastic Rivet

3) Earth Rail

4) Earth Rail Post

5) M3 x 12mm Screw andWasher (2 places per post)

6) Backplane

7) “C” Holes


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3.2.5 Installing the Backplane

Install a backplane to one of the following:

• A flat surface

• A "G" or "T" type DIN-rail

• A Bently Nevada enclosure

If you order an enclosure with the interface system, the system will be shippedwith the backplane installed within the enclosure. This installation will use somemounting kit hardware, specifically, those parts pertaining to a surfaceinstallation.

3.2.6 Installing the Backplane onto a Surface1. Drill and tap holes into the surface that the backplane will mount at the

locations marked "A". See page 15 for backplane dimensions.

1) MountingHole “A”

2) M4 x 12mmScrew

3) LockingWasher

4) Plain Washer

5) Backplane

6) M4 x 10mmSpacer

7) M4InterferenceWasher

8) TappedMountingSurface

2. Mount the backplane using the spacers and screws as shown.

3.2.7 Installing the Backplane onto a DIN-railThe mounting hardware kit will have a combination "G" and "T" DIN-rail mount.For simplicity, only a T-section illustration is shown. Both "G" and "T" DIN-railmounts follow the same procedure.

To attach the backplane to a "G" or "T" DIN-rail:


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1. Attach the DIN-rail mounting feet onto two lengths of "G" or T-section DINrails.

1) MountingHole “A”

2) DIN RailMountingFoot

3) M4 x 20mmScrew

4) LockingWasher

5) PlainWasher

6) Backplane

7) M4 x 10mmSpacer

8) M4 Interference Fit Washer

2. Position the screws and washers through the backplane mounting holesmarked "A" as shown.

3. Attach the backplane to the mounting feet with the fixing screws as shown.

Dimensions: Millimetre (inch)


13

3.2.8 Installing the Backplane into an Enclosure

The Bently Nevada enclosure includes a mounting plate with tapped holes thatcorrespond to the "A" holes of the backplane. Position and install the backplaneas shown using the surface mount portion of the mounting kit.

Dimensions: Inch (millimetre)


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3.2.8.1 Installing the Enclosures to a SurfaceInstall the enclosure to a surface use the following procedure:

1. Attach wall-mounting lugs to the underside of the enclosure as shown.


1) Wall Mounting Lug

2) Alternate Position

2. Secure with a fixing screw. Slide the screw into the TOP of the enclosureand screw it into the mounting lug. This requires a long screwdriver.

3. Mount the enclosure on a surface at the appropriate centers. Refer to thedata sheet at the end of this manual.


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3.3 Backplane Dimensions (Vibration)


3.4 Backplane Dimensions (Keyphasor)



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4. Wiring the HardwareThe 3500 Field Wiring Package (130432-01) shows how to connect transducers, powersupplies, and monitors to the interface modules. This section shows the location of theconnecting terminals and contains important precautions about safe and hazardousarea connections that you must consider before you use the drawings to connectcomponents.

WARNINGNON-Intrinsically Safe and Intrinsically Safe wiring MUST be separated by50 mm minimum. Reference local wiring codes before wiring theinstallation.

Section 4 — Wiring the Hardware

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111087 9 12 1413

20 to 35 Vdc

654321

2

3

4

5

4.1 Location of Terminals on the VibrationTransducer Interface Module

1) Transducer

2) Hazardous Area

3) Safe Area

4) Vibration Transducer Interface

5) 3500 Monitor

TerminalNumber

Function

2

5

6

7

8

13

14

Supply to hazardous area

Signal input

Transducer Common

Monitor Common

Isolator Signal Output

Power Supply Common

Power Supply Positive (+Vs)

Notice that the module terminal connections are located at the following positions:


18

321 764 5 8

2

3 4

5 6

7

• Terminals 1 through 6 are on the top of the Vibration Transducer Interface module.These terminals connect to the screw clamp connector for the hazardous-areaconnections.

• Terminals 7 through 14 are located on the bottom of the Vibration TransducerInterface module and connect to the backplane. These pins are the safe areaconnections.

4.2 Location of Terminals on the Backplane

4.2.1 Vibration Backplane

1) OK Inhibit Contacts (external): Vibration Transducer Interfaces 1 to 4.2) OK Inhibit Contacts (external): Vibration Transducer Interfaces 5 to 8.3) Signal and Common: Terminals 7 & 8 of Vibration Transducer Interfaces 1 to

4.4) Signal and Common: Terminals 7 & 8 of Vibration Transducer Interfaces 5 to

8.5) Power Input/ Output: Input: Terminals 13 & 14 of all Vibration Transducer

Interfaces; Output: Bussed Power to Adjacent Backplanes.6) Power Input/ Output: Input: Terminals 13 & 14 of all Vibration Transducer

Interfaces; Output: Bussed Power to Adjacent Backplanes.7) Position of Vibration Transducer Interfaces 1 to 8 (Position 1 = Ch1.).


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1 3 42

3

2

4

5

4.2.2 Keyphasor Backplane.

1) Signal and Common: Terminals 7 & 8 of Vibration Transducer Interfaces 1 & 2.2) Signal and Common: Terminals 7 & 8 of Vibration Transducer Interfaces 3 & 4.3) Power Input/ Output: Input: Terminals 13 & 14 of all Vibration Transducer

Interfaces; Output: Bussed Power to Adjacent Backplanes.4) Power Input/ Output: Input: Terminals 13 & 14 of all Vibration Transducer

Interfaces; Output: Bussed Power to Adjacent Backplanes.5) Position of Vibration Transducer Interfaces 1 to 4 (Position 1 = Ch1.).

4.3 Connecting Single or Redundant Power Suppliesin a Ring Main SystemSupply power to the Vibration Transducer Interface modules by connecting a 20 to 35Vdc power supply to the backplane as shown. Connect two power supplies to thebackplane for dual redundancy.

There are two mating power supply connectors (Position “A”, Position “B ”) on eachbackplane. Each connector can be used to connect either primary only, secondary onlyor both primary and secondary power supplies.


20

0V0V

V2V1

V2

0V0V

V1

V2

0V

V1

0V

V2

0V0V

V1

4

1 2

3

4

3

5

55

5



3) Connector Position “A”

4) Connector Position “B”

5) Power Supply

To reduce wiring while powering the 3500 Vibration Transducer Interface system, werecommend using a "ring-main" system. A "ring-main" system has the followingcharacteristics and limitations:

1. An individual backplane can be removed from power without effecting the operationof the other backplanes.

2. Power MUST connect to the next backplane as shown in the figure on the nextpage.

3. The power supply current in the "ring-main" system must NOT exceed 3.8 ampsfrom a single power supply (Refer to the data sheet at the end of this manual).

4. Wire sizes must accommodate load and voltage drop.


21

0V V10VV2

0V

0V

V10VV2

V10VV2

0V V10VV2

0V V10VV2

0V V10VV2

0V

V20V

V1

1) Power Supply


22

4.4 Precautions about Connecting the Screw ClampConnectors

Connection of a transducer to a Vibration Transducer Interface module is through thehazardous area screw clamp connector.

1) Screw Clamp Connector

2) Vibration Transducer Interface module

WARNINGAn explosion may occur if the screw clamp connector touches anunprotected safe-area component.

If you install or remove the screw clamp connector while power is on, support theconnector so that it cannot touch the backplane or the safe-area circuits. Contactbetween the screw clamp connector and the backplane may bypass the essentialsegregation between safe-area and hazardous-area circuits.


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4.5 Connecting Cable Assemblies to Backplanes

The safe area signals between the backplane and the 3500 Monitoring System areconnected using cable assemblies. The cable assembly type is determined by the 3500Monitor (3500/25, 3500/40, 3500/42, 3500/44 or 3500/50) and backplane (Vibration orKeyphasor) combination.

The following table shows the 3500 Monitor, Cable, Backplane and Transducercombinations that can be used with the 3500 Galvanic Isolator Interface.

3500 Monitor Cable Backplane TransducerType Channel

#Type Type Vibration

TransducerInterface #

Type(s)

3500/25Keyphasor *

1 & 2 (top)or

1 & 2 (bot)

Keyphasor

p/n 141708

Keyphasor

p/n 141660A02

1 & 2or

3 & 4Proximitor

3500/40Proximitor * 1,2,3 & 4

Vibration

p/n 141707

Vibration

p/n 141660A01

1,2,3 & 4or

5,6,7 & 8Proximitor

3500/42Proximitor

/Seismic*1,2,3 & 4

Vibration

p/n 141707

Vibration

p/n 141660A01

1,2,3 & 4or

5,6,7 & 8

Proximitoror

Accelerometer3500/44

Aeroderivative* 1,2,3 & 4Aero.

p/n 141710

Vibration

p/n 141660A01

1,2,3 & 4or

5,6,7 & 8

AccelerometerInterface

(Velocity only)3500/50

Tachometer* 1 & 2Vibration

p/n 141707

Vibration

p/n 141660A01

1 & 3**or

5 & 7**Proximitor

* I/O Module type must be External Termination** 3500/50 Tachometer: Positions 2 & 4 or 6 and 8 not available.

The 3500 Field Wiring Package shows how to connect the 3500 Monitors to thebackplanes and how to identify the Vibration Transducer Interfaces to which the safearea and hazardous area field wiring is attached.

The cable assemblies have different connector types at each end, namely, 90-degcable entry and 45 deg cable entry. The 90 deg cable entry connector connects to the3500 Monitor and the 45 deg cable entry to the backplane. A 45-deg cable entry is usedto ensure that there is sufficient spacing between hazardous and safe area field wiringand enable easier installation.

The cable assemblies, method of installation and cable pin out diagrams are shownbelow.


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1

3

2

65

4

1

2

3

1) Vibration and Aeroderivative Cable Assembly2) Keyphasor Cable Assembly3) 25-way Male Connector with Straight Cable Entry (3500 Monitor)4) 25-way Male Connector with 45o Cable Entry (Backplane)5) 9-way Male Connector with Straight Cable Entry (3500 Monitor)6) 9-way Male Connector with 45o Cable Entry (Backplane)

1) Cable2) 45o Connector3) Backplane


25

3 3

2

4

5

4.5.1 Cable Pin Outs

4.5.1.1 Cable Number 141707-AXXXX-BXX, 3500 Galvanic Interface (Vibration)Cable

1) Connector J1 (3500)2) Connector J2 (Backplane)3) Connect Shield to Backshell4) TP= Twisted Pair5) N/C= No Connect


26

3

5

4

3

2

4.5.1.2 Cable Number 141708-AXXXX-BXX, 3500 Galvanic Interface(Keyphasor) Cable



27

2

3

5

4

3

4.5.1.3 Cable Number 141710-AXXXX-BXX, 3500 Galvanic Interface(Aeroderivative) Cable



28

2

3

5

4

4.6 Connecting Special Alarm Inhibits

The Special Alarm Inhibit is a user-invoked function that is used to inhibit all thealarms in a monitor. More details of this function are given in the relevant 3500monitor operation and maintenance manual.

Connect the Special Alarm Inhibits remote closure contacts to the 3500 Monitorusing contacts that are located on the Vibration Backplane as shown below. Thewire that is recommended is 18AWG to 22 AWG stranded 2-wire shielded withinsulting sheath. The shield should only be connected at one end as shown. WhenSpecial Alarm Inhibit is not required, these connections can be left unconnected.

1) Special Inhibit ‘A’ Remote Closure Contacts (User Installed)2) Special Inhibit ‘B’ Remote Closure Contacts (User Installed)3) Inhibit Return Wire4) Inhibit Wire5) Shield Wire

4.7 Configuring the 3500 Monitoring SystemUse the 3500 Rack Configuration software to configure the Bently Nevada 3500monitors connected to the 3500 Galvanic Isolator Interface for GALVANICISOLATOR.

Section 5 — Maintenance and Troubleshooting

29

5. Maintenance and Troubleshooting

5.1 MaintenanceWe recommend that you use the following checklist to check the condition of the3500 Galvanic Isolator Interface system installation at least once every twoyears. Use this list more frequently if the installation is in a particularly harshenvironment.

" Modules are labeled properly and in the correct position according to therelevant documentation.

" Modules and hazardous-area connectors are correctly and legibly tagged, theconnectors are plugged into the matching modules, and the tag details givencomply with the relevant documentation.

" Modules and hazardous-area connectors are securely plugged into theirmatching sockets.

" All connections to the backplane and to the hazardous-area connectors areproperly made.

" Inspect connecting cables to backplanes and to hazardous-area connectorsfor the following:

• Specified type and rating

• Correctly routed and segregated (particularly in the Bently Nevadaenclosures). Non-Intrinsically Safe and Intrinsically Safe wiring MUST beseparated by 50 mm minimum. Reference local wiring codes.

• Not frayed or otherwise damaged.

• Cable shields and transducers (when applicable) are properly earthed.

• One backplane power LED is on for each installed power supply.

• The power LEDs on all modules are on.


30

2

3

4

4

3

5.2 Troubleshooting

When troubleshooting, carry out the following steps as far as is necessary:

1. Check that at least one of thebackplane power supply statusLEDs are ON. One LED will beon for each installed powersupply.

2. If both power LEDs are OFF,check the power supply fuse.Change it if necessary. Thefuse should be a 1 amp,medium time-lag fuse.

3. Check that the power LED on allmodules are ON.

4. Exchange potentially faultymodules with working units byusing the installation instructionsin "Installing the Hardware".

To exchange potentially faultyVibration Transducer InterfaceModules:



3) Power Supply Fuse (1 ARating)

4) Power Supply LED’s

• Unplug the hazardous area connector. Secure the connector so that itcannot contact Safe-area components.

WARNINGAn explosion may occur if the screw clamp connectortouches an unprotected safe-area component.

• Unplug the module from the backplane.

• Plug the replacement unit into the backplane.

Section 5 — Maintenance and Troubleshooting

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• Replace the hazardous-area connector.

5.2.1 Bench Testing IsolatorsTest potentially faulty modules in workshop conditions using the installationinstructions in "Installing the Hardware". Test the suspected module using thefollowing procedure:

1. Connect a power supply to a spare backplane.

2. Plug the suspect module into any position on the backplane.

3. Wire the module as shown.

R1 = 1000 Ω

V1 = Digital Voltage

Meter

Vin = Function

Generator

Vo = Digital Voltage

Meter

Vs + = +20 to +35 Vdc

Vs - = Common

4. Set the input to the module tothe following:

Vin = 0.707 Vrms @

100 Hz

-6.0 Vdc offset

5. Verify that the output is asfollows:

V1 ! -19.0 Vdc

Vo = 0.707!0.035 Vrms @ 100 Hz -5.9 to -6.1 Vdc


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5.2.2 Replacing Faulty IsolatorsIf a module or backplane is faulty, contact your local Bently Nevadarepresentative for the proper replacement procedure. Do NOT attempt to repairor modify the module or backplane because this may affect the intrinsic safety ofthe module.

3500 galvanic isolator

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