VOLTAGE REGULATOR MODULE (A1)TESTING AND ADJUSTINGVOLTAGE REGULATOR MODULE (A1)One of the components used in the voltageregulator assembly on the SR 4 Generator is theregulator module (A1). It is a completely sealed unit.Failure of the regulator is usually. caused by failure ofother components in the circuits of the voltage regulatorassembly.A regulator module (A1) with a defect can causeany of the following conditions:No AC voltageAC voltage too lowAC voltage too highLack of AC voltage stabilityNOTE: Do not install a new regulator module (A1)until you have thoroughly tested all of the othercomponents and circuits in the voltage regulatorassembly.Tests can be made on the regulator modulewhen the engine is running or is stopped. To test theregulator when the engine is running, install a single-pole, single-throw (SPST) switch in series with wire (24).This switch must have the ability to automatically turn offwhen it is released. Screw terminals must be on theswitch.NOTE: Remove wire (24) from terminal (24). Connectswitch to wire (24). Install another wire between theother side of the switch and terminal (24).Start the engine and run it at 1200 to 1250 rpm.Close the switch for a moment and read the value of theline voltage. If the generated voltage is approximatelythe same percent of rated voltage as the low idle rpm isof rated rpm, the regulator is working correctly.SPTS SWITCH INSTALLED IN SERIES IN WIRE (24).Example: If an electric set is rated for 240 voltsat 1800 rpm (60 hertz), it will generate 160 volts at 1200rpm (40 hertz).Run the engine at high idle rpm and close theswitch for a moment. Read the line voltage while theswitch is closed. If the line voltage is approximately thesame as rated voltage, the regulator module is workingcorrectly. If the failure condition does not change, theregulator module can have a defect.78
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