Adjustment/Test; Testing The 400 Hz. Generator Set; Pre-Operational Test Procedures; General - Hobart 120CU20 Operation And Maintenance Manual With Illustrated Parts List

OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
Section 3

1) General.

These adjustments and test procedures are applicable to testing and adjusting the generator set after
major repair, major parts replacements, or overhaul.
IMPORTANT
In order to perform most of the following tests, a load bank with an EF interlock circuit
is required. If no EF interlock is available on a load bank, see special procedure in the
EF Bypass section for testing the EF circuit.

2) Testing the 400 Hz. Generator Set.

a) Pre-operational Test Procedures.
(1) Connect cables from the generator output terminals to a load bank. Use cables of the same size
and length as those used in service. Be sure the generator output N cable is grounded.
(2) Check engine oil level. Oil should be at high bar on the dipstick.
(3) Check radiator coolant level (See Section 2-2).
(4) Check tension of drive belt (See Section 2-2).
(5) Inspect for oil, fuel and coolant leaks.
(6) If the setting of the output voltage coarse adjustment potentiometer (Figure 7) on the voltage
regulator has been disturbed, set it at center position (halfway between full clockwise position and
full counterclockwise position).
(7) Check control panel lights circuit breaker (Figure 2) by pressing panel "LAMPS" push button
switch (Figure 1). If panel lights operate, the circuit breaker, switch, and lamps are good.
(8) Check fault indication lights by pressing "TEST/RESET" push button switch. If fault code display
lights up, the control circuit breaker is good.
(9) Make a general inspection of all wiring, and terminals. Inspect the equipment to be certain no
damage will result from starting the engine.
October 15, 2013

Adjustment/Test.

Chapter 2-3
Page 1