Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 89

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
(11) In EF bypass mode, apply 1/3 to 1/2 load at the load bank and allow the unit to run for 15 to 30
minutes. Observe operation of all monitoring instruments.
(12) Increase load at the load bank to full load.
(13) Check operation of the engine ECM by observing the frequency meter when generator is
switched from no load to full load, and vice versa. Use the No. 1 contactor control push button
switch to apply and remove load several times. Steady-state frequency droop should be no more
than 1 Hz.
(14) Follow instructions in Paragraph 3 to set voltage regulator line-drop compensation for the length
and size of cable being used.
(15) Check voltage regulator, at intervals, from no load to full load. Observe and note voltage at
various loads. Steady-state voltages should vary no more than +/- 1% from normal output
voltage.
(16) Operate the No. 1 output circuit of the unit no less than 10 minutes under full load. The overload
protection MUST NOT trip.
(17) Operate the No. 1 output circuit of the unit at 125% load (325 amperes) for 5 minutes immediately
following the full load run. The overload device MUST trip within 5 minutes, and the fault code
display should read "70.18" indicating an overload condition in "OUTPUT NO 1" (Reference fault
chart in Section 2-4).
(18) Reset the fault by pressing "TEST/RESET" push button.
d) Testing the No. 2 output circuit
(1) Repeat steps (1) through (18) in the previous section "Testing the No. 1 Output Circuit" for
testing the No. 2 output circuit.
e) Testing and checking meters, switches, protective monitoring circuits, and fault code display
(1) Check accuracy of AC voltmeter
a Open door of control box and connect a master voltmeter of known accuracy to terminals of
the AC voltmeter.
b Compare the unit's voltmeter reading with master meter. Error must not exceed 2% of full
scale.
(2) Check accuracy of AC ammeter
a Connect a master ammeter of known accuracy to the AC ammeter.
b Compare the unit's ammeter reading with master meter under various loads. Error must not
exceed 4% of full scale.
(3) Check operation of the "METER SELECT" switch.
a In any LINE-TO-NEUTRAL position, the voltmeter reading should be 115 volts when the LED
under the voltmeter indicates one of the 3-phase being checked.
May 2, 2013 Chapter 2-3
Page 7