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 22 page image

7. Place the CONTROL FUNCTION switch in the AUTO/REMOTE position. After the time delay period, thecontrol should cause the regulator to step up to thelower band edge. This will display on the LCD panel.Example: 120 V and a 2 V bandwidth = 119 V lowerband edge.Control bench testingWhen applying external voltage to a CL-7 control,disconnected from the control box back panel, follow thesesteps:1. Place a jumper between positions 7 and 8 of thedisconnect plug on the wiring harness of the control.2. Place a second jumper between positions 6 andterminal G of the disconnected plug. There are two Gterminals on the harness plug. The jumper would beplaced into the G terminal with a wire connected to theother side.3. Connect the external source to the external source poston the front of the control. Connect the hot lead tothe black terminal post, the neutral to the white post,and the ground to the green terminal post. Refer toSection 1: Control Front Panel: Connecting power toexternal source terminals for detailed instructions onapplying power to the external source terminals.ote:N For a multi-phase control, this method willonly enable powering of the main control. It isrecommended to install the control into a controlbox to fully power a multi-phase control using theexternal source terminals.Field calibration checkTo check the calibration of the control, compare the voltagethat the control reports on the display to the voltagemeasured at the test terminals.ote:N Field calibration checks are only an indication ofcalibration and are not as precise as the proceduredescribed in Section 8: Troubleshooting.1. Connect an accurate true-RMS responding voltmeter tothe voltmeter terminals.2. Use the keypad to access FC 47 parameter. Key in:FUNC, 47, ENTER.Or access via the menu: FEATURES > Calibration >Voltage Calibration.3. Under ideal conditions, the displayed voltage ofthe control will match the voltage of the voltmeter.Realistically, the voltages may be slightly differentbecause:a. The metering and operation is based upon the RMSvalue of the fundamental power line frequency.Thus, the metered values exclude the influences ofharmonic voltages which are probably present on theline. A true RMS meter, however, will include theseharmonic voltages in its calculations of the RMSvoltage. This does not present a problem with eithermetering device, since each device uses a differentapproach to metering.b. The calibration of the voltmeter being used formeasurement is probably not exact. Even a verygood meter with a basic accuracy of 0.5% couldbe in error by as much as 0.6 V (out of 120 V) andstill be considered to be “in calibration.” The controlis calibrated using a conditioned power supplyand reference voltmeters which are periodicallycalibration-checked, traceable to the National Bureauof Standards.ote:N The control firmware is designed to perform ratiocorrection. Through the use of the ratio-correctiontransformer (RCT) located on the back panel, thevoltage brought to the control is usually correctedto the 120 V base voltage. However, there are someratings in which this voltage is not fully corrected bythe RCT. Refer to the regulator nameplate for specificinformation for that regulator. Table 5 gives a generalindication of these voltages.When mounting the CL-7 control into an existing enclosure,the existing enclosure may not have an RCT installed. Inthis case the voltage measured on the voltmeter terminalsmay not match the voltage read on the control.Whatever voltage results from dividing the nominalsystem voltage, FC 43, by the overall PT ratio, FC 44,is considered by the control to be the nominal voltage.Therefore, when that voltage appears at the input of thecontrol, 120 V will be reported as the output voltage, FC6, whether the nominal is actually 120 V or not. Likewise,the compensated voltage, FC 8, and input voltage, FC7, will be scaled accordingly. If the regulator is equippedand programmed for reverse power operation, thecompensated voltage will be correct even during reversepower conditions.Also note that the base voltage can be set to a 240 V baseusing FC 148. When this is done, all secondary voltagedisplays will also be scaled to correspond to the 240 Vbase. Despite the displays however, the control itself is stillpowered using an approximate 120 V input.The load voltage, FC 10; source voltage, FC 11; andcalculated parameters such as the kVA, kW, and kvar, arenot scaled similarly to FC 6 and FC 8. Instead, they reflectthe true value of line voltage.ote:N The voltage measured at the test terminals duringreverse power flow is the new source voltage at theload bushing of the regulator.16INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225003EN April 2018CL-7 Voltage Regulator Control