Eaton Cooper Power Series Installation, Operation And Maintenance Manual

Also see for COOPER POWER SERIES: Installation and operation instructions Installation instructions Installation instructions Installation and operation instructions Operation instructions

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Eaton Cooper Power Series Installation, Operation And Maintenance Manual Manual pdf 171 page image

No band indicatorsIf the band indicators are not working when the voltage isout-of-band, check the following:1. Check FC 56, Reverse Sensing Mode. If FC 56 is set toLock Forward and there is reverse power, the indicatorwill not display and the voltage will not regulate.2. Check FC 57, Reverse Current Sense Threshold and*Load Current (*Metering PLUS). If the load current isless then the reverse threshold current, the indicatorswill not work and the regulator will not regulate.3. If the regulator has been serviced and the currenttransformer circuit was involved, check the polarity ofthe current transformer. If the polarity is reversed, theband indicators will not display.Metering troubleshootingLoad voltage secondary (output voltage), does not match thevoltmeter test terminal voltageWhen the output voltage at FC 6 is several volts differentfrom the voltage at the voltmeter test terminals, verify thatthe following function code settings are per the nameplate:1. Verify FC 43, System Line Voltage (Load Voltage) is setper the nameplate value.2. Verify FC 44, Overall PT Ratio is set per the nameplate.3. Verify RCT Control Tap located on the back panel of thecontrol assembly is set per the nameplate.4. Verify Control Winding E Tap and DifferentialTransformer P Taps, if present, are set per thenameplate. E taps are located on the terminal board onthe tap-changer inside the tank. P taps may be locatedon the terminal board on the top of the tap-changer oron the differential potential transformer located on theside channel inside the regulator tank.When all the settings are set per the nameplate, theregulator is in neutral, and the system line voltage or loadvoltage matches what is stated on the nameplate, thevoltmeter test terminals on the control panel will read thevalue on the nameplate.No load currentWhen there is no load current reading at FC 9, LoadCurrent, Primary, or any of the metering componentsrequiring current as part of the calculation, check the Cswitch on the back panel. The switch should be open. Ifthe C is closed, the current transformer is shorted and nocurrent reading is available.Control calibrationWARNINGExplosion Hazard Verify that both the neutral light andthe position indicator hand indicate neutral when thetap-changer is physically in the neutral position Lackof synchronization will cause an indefinite indicationof NEUTRAL Without both indications of neutral,bypassing of the regulator at a later time will not bepossible, and the line must be de-energized to avoidshorting part of the series winding Failure to complycan result in serious personal injury or death andequipment damage VR-T212NOTICEEquipment Damage Be mindful of polarity when usingan external source Polarity reversal will result in controldamage VR-T201 0All controls are factory-calibrated and should not need to berecalibrated. However, calibration can be performed for boththe voltage and current circuits using the steps that follow.The factory calibration can be restored using FC 150.Voltage calibration1. Connect an accurate true-RMS-responding voltmeterto the voltmeter terminal. This voltmeter should havea base accuracy of at least 0.1% with calibrationtraceable to the National Bureau of Standards.2. Connect a stable 50/60 Hz voltage source (with lessthan 5% harmonic content) to the External Sourceterminals.3. Set the POWER switch to EXTERNAL.4. Adjust the voltage source to provide 120.0 Vac to thecontrol, as read on the reference voltmeter.5. Before calibration can be performed, Security Level 3must be activated by entering the proper security codeat FC 99, Security Code.FUNC, 99, ENTER; Admin (default), ENTER.6. Access FC 47, Voltage Calibration.FUNC, 47, ENTER.7. The display will show the voltage applied to the control.This should correspond to the reading on the referencevoltmeter. If the control reading is significantly different,(0.6 volts or more), the calibration can be alteredby pressing EDIT, keying in the correct voltage asdisplayed on the reference meter, and pressing ENTER.The voltage circuit is now calibrated.163INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225003EN April 2018CL-7 Voltage Regulator Control