Hobart 9OC24S Operation Manual page 166

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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC:. NO. 5381A
(12) Check adiustable voltage range in automatic operating mode.
(a) Observe voltmeter [(30), Fig.
21 and turn rheostat (46) CLOCKWISE to full
clockwise position. Maximum voltage should be at least 134 V AC, or
higher .
NOTE: If voltage should decrease when the knob is turned clockwise,
it indicates that internal wiring of the voltage regulator is in-
correct. Replace the complete regulator tray assembly.
(b) Observe voltmeter and turn rheostat knob to full COUNTERCLOCKWISE
position. Minimum voltage should be 108 V AC, or lower.
(13) Observe voltmeter and adjust rheostat to obtain 115-V AC voltmeter reading.
(14) Check adiustabl e voltage range in manual operating mode.
(a) Open the generator control tray C(14), Fig. 21 and place the automatic-
manual switch (33) in MAN UAL position.
(b) Observe voltmeter
(30) and turn manual control rheostat (31) CLOCKWISE
to full clockwise position.
Maximum voltage should be at least 160 V AC.
(c) Observe voltmeter and turn rheostat (31) to full 'COUNTERCLOCKWISE
position. Minimum voltage should be 95 V AC or less.
(d) Adjust voltage to 115 V AC, then return the automatic-manual switch
to AUTOMATIC position.
(15) Position load bank switches, etc., to apply a light load to the generator.
(16) Place the load contactor control switch C(17), Fig. 21 in the top, spring loaded,
ON position. Hold in this position momentarily. The indicating light (12)
should glow GREEN and an amperage value should appear on the AC ammeter
(32).
(17) Release the switch (17) d I I an a ow it to return to the center ON position. The
load contactor should open immediately, and the generator "on" indicating
light should go OFF.
This is because the plug interlock relay (Ref. l-l, Fig.
7, item 18) is not receiving power from an outside source of 28 V DC. It in-
dicates that the plug interlock contacts are OPEN as they should be when the
interlock coil is not receiving 28-V DC power.
(18) Open the protective relay tray and place the test bank switch [(40), Fig. 21 in
ON position.
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