GE prolec VR-1 Installation, Operation And Maintenance Manual

Also see for VR-1: Installation operation & maintenance

GEH-7299A: Installation, Operation and Maintenance Manualfor Type VR1™ Single-Phase, Step Type Regulatorsprolec.energy/prolecge29Trouble Cause RemedyRegulatorwill notoperate eitherautomaticallyor manuallyor remains inmaximum loweror maximumraise position.Loss of sensingsignal from theregulator.Check for control sensing voltage at the voltage test terminals on the front ofthe control panel with an AC voltmeter. If no voltage occurs at this point, eitherthe external power supply switch or the circuit breaker is defective. Checkfor sensing voltage between NN-9 and NN-10. If no voltage appears at theseterminals, refer to nameplate for proper jumper connection from terminal boardNN-20, NN-21, NN-22 to NN-9. If jumper is correct, the problem is outside thecontrols. If voltage does appear at this point, check for faulty external powersupply switch or a faulty circuit breaker.Motor circuit isnot functioningproperly orthe controlswitch may bedefective.If correct voltage is measured at the voltage test terminals, place the motorcontrol switch to RAISE position (check to ensure the regulator is not in themaximum RAISE position). Place an AC voltmeter (150-volt scale) betweenNN-27 and NN-26. If voltage is not measured here, the control switch is faulty. Ifvoltage does appear here, the motor circuit is defective.Indicator limitswitches arenot operatingproperly.Check the position-indicator switch mechanism. Refer to MAINTENANCEsection concerning removal of the indicator dial.Warning: Before removing the indicator dial assembly, de-energize theregulator.Regulatorfunctionsmanually but notautomatically ineither raise orlower directionDefective DCpower supplylocated on thecomponentboardassemblyCheck the sensing circuits and relay voltage supply circuits by setting theControl Switch to TEST and observing the band-edge indicator lights. Thischeck is made with 120-volts, supplied to the control from either the internalregulator supply or an external source. To use an external source, attach powersupply leads to the test terminals marked EXTERNAL and place the PowerSupply switch on External. Vary the voltage level adjustment control in and outof the bandwidth, above and below 120-volts.If the band-edge indicating lights (high and low) show the correct voltage level,the voltage supply to the relay in correct. If they do not, check the DC voltageper Table 5.Defective time-delay circuitIf the timing circuit does not function, the silicon rectifier SCR1 will not conductand complete the ground circuit for the relays. Test time-delay rheostat R25with a multi-test meter.Warning: Before disconnecting any plug connector between the control panel,component board and nn terminal board or disconnecting any connection tothe NN terminal board, remove the control cable flug from the bottom ofthe position indicator housing. Remove the external power supply used fortesting when trouble shooting is completed.The range will be from 0 to 2.5 megohms ± 10 percent. This is done bydisconnecting the multipin plug located in the lower right-hand corner of the A1circuit board. Replace the rheostat if it is defective. If the rheostat is normal, theproblem will be located on the board assemply. Replace the component board.Defectivemotor leadsIf the relays pick up and drop out properly but the motor does not becomeenergized, check the motor leads at NN-26, NN-27 and NN-28.Table 8. Trouble Shooting Chart