Operation Manual

GENERATOR PRODUCES LOW VOLTAGE WHEN LOAD APPLIED
CAUSE CHECK AND REMEDY
Excessive load Reduce load. The load on each leg should be evenly balanced, and rated current
should not be exceeded on any leg.
Large motor starting or low Motor starting currents are too large for the generator. When starting multiple motors,
load power factor sequence the motors and start the largest motors first. Reduce lagging power factor
load.
Driver speed droop or belt slip Check driver. If belt driven, check belt tension. Check under frequency setting on
regulator. Under frequency voltage roll-off may be activated.
Reactive droop If the generator is equipped for parallel operation, some droop is normal as reactive
load increases. When operating as a single unit, the parallel CT can be shorted to
eliminate this effect. Refer to Regulator manual.
Line drop If voltage is proper at generator terminals but low at load terminals, increase external
wire size.
Defective diodes, suppressor, or windings Test the generator using the 12 volt battery test as specified in the testing section. If
the results indicate generator problems, perform insulation, continuity, and diode tests
as specified in the testing section.
GENERATOR PRODUCES FLUCTUATING VOLTAGE
CAUSE CHECK AND REMEDY
Fluctuating engine speed Check engine and governor systems for malfunctions. Check load for fluctuation.
Regulator stability Adjust Regulator stability. Refer to Regulator manual.
Regulator external rheostat Replace defective or worn rheostat. Use shielded cable to minimize electrical noise.
Defective rectifier assembly Check assembly for loose connections. Test the diodes as specified in the test section.
Loose terminal or load connections Improve connections both mechanically and electrically.
Defective regulator Replace regulator.
GENERATOR PRODUCES HIGH VOLTAGE
CAUSE CHECK AND REMEDY
Faulty metering Check voltage with separate meter at generator terminals.
Incorrect connections Verify generator connections. Refer to drawings supplied with the generator or
connection diagrams in this manual.
Regulator adjustments Adjust regulator. Consult regulator manual.
Leading power factor Check the power factor of the load. If power factor is leading, change load
configuration. Excessive leading power factor (capacitors) can cause voltage to climb
out of control.
Incorrect regulator connection Verify regulator voltage sensing is connected correctly. Consult regulator manual.
Defective regulator Replace regulator.
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