Hobart 9OC24S Operation Manual page 241

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,MOTOR GENERATOR DIVISION
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HOBPlRT BROTHERS COMP*NY
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OPERATION, M';;iNTENANCE AND OVERHAUL MANUAL TM-240A
SELF-PROPELLED GENEdATOR SET, SPEC. NO. 5381A
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B
AND CONDITIONS
PROBABLE CAUSE TEST, CHECK, AND/OR REMEDY
PROTECTIVE CIRCUIT
1. Load contactor A. The overvoltage condition A. Press reset switch (39, Fig. 1) and
opens during
may have been the result
power delivery.
of a sudden drop in the
resume power delivery. Observe
Overvoltage in- load, or possible tampering
voltmeter (30, Fig. 1) to be cer-
dicating light with voltage regulator rheo-
tain voltage is normal 115 V AC.
ON. stat (46, Fig. 1), and may
Adjust to normal if necessary. If
have been a normal action.
the load contactor is opened again
and an overvoltage condition is
indicated by light (2R) (36, Fig.
l), proceed to step B.
B. Defective overvoltage
sensing relay (OV)
8. See NOTE above. Use voltage
adjusting rheostat (46, Fig. 1)
to reduce voltage to 110 V AC.
Press reset switch (39, Fig. 1)
and resume power delivery. Ob-
serve voltmeter and gradually in-
crease voltage with rheostat. If
the overvoltage sensing relay.(OV)
functions to open the load con-
tactor at any value less than 134 V
AC, it is defective. Remove pro-
tective relay tray and replace.
2. Load contactor A. An undervoltage condition
opens during
A. Observe generator voltage on
caused the undervoltage
power de I ivery.
voltmeter (VM) and adjust to
sensing relay (UV) to func-
kdervoltage
normal 4 15 V AC with voltage
tion normally.
indicating light
regulator rheostat (46, Fig. 1).
Resume normal operation. If
ON.
the load contactor opens again
and an undervoltage condition
is indicated by light (3R) (35, Fig.
l), proceed tostep B.
B. Defective undervoltage B. See NOTE above. Press reset
relay (UV)
switch (39, Fig. 1) to turn off in-
dicating light (3R). Use rheostat
(46, Fig. 1) to reduce voltage
104 V. The undervoltage indicat-
ing light should NOT be turned on
during a time delay of 5 seconds
or more. If the light is turned on
after a delay of 5 seconds, the
Tern .~I. I- c-l- I. P-1 . IPI . - - .- 3-x
Ott 30/73
lrouole onoormg Lnarr (xreer 13 of IY)
Figure 6
3-2
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