Hobart 9OC24S Operation Manual page 238

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$MOTOR GENERATOR DIVISION
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HOBART BROTHERS COMPrmY
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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
TROUBLE ,SYMPTOM,
AND CONDITIONS
PROBABLE CAUSE TEST, CHECK, AND/OR REMEDY
LOAD CON TACTOR OPERATING CIRCUIT (CON TIN UED)
1. (Con tin ued) A. (Continued)
(3) Defective load con-
tactor control switch
(5s) (17, Fig. 1)
A. (Continued)
(3)Connect a jumper lead
between terminals B17 and
Bll, Fig. 3. If the load
contactor closes when con-
nection is made , replace
the switch (5s) (17, Fig. 1)
(4) Defective rectifier
(3REC) (l-l, Fig.
10, item 5)
(4) With, terminals D17 and D12
connected with a jumper,
check voltage between
terminals X 1 and X2 on the
load con tactor. If voltage
is not approximately 90-V
DC, replace the rectifier
(l-l, Fig. 10, item 5).
(5) Defective load con-
tactor (1LC) coil
(5)Disconnect leads at the loac
contactor terminals Xl and
X2. Use ohmmeter to check
coil resistance between
terminals Xl and X2. Re-
sistance should be approxi-
mately 60 ohms. If coil is
defective I replace the
load con tactor.
!. Load contactor will A. 28.5-V DC is not
reaching A. Check voltage at terminal B9,
close when contact-
plug-interlock relay (1PIR)
Fig. 3. Voltage should be 28.
or switch (17, Fig.
from aircraft for the follow-
1) is held in
V DC. If not, voltage is not
ing reason (s).
being supplied from aircraft.
momentary ON
Check causes as follows:
position. Opens
immediate I y when
(1) Generator to aircraft
(1) Inspect cable connector
switch is released cable connector defec-
plug thoroughly for damaged
to center ON
tive or not plugged in-
E
and
F terminals. Be sure
position. to aircraft receptacle the plug is fully mated with
connector.
the aircraft receptacle con -
nectar and making good
contact.
3-2
Page 22
Trouble Shooting Chart (Sheet 12 of 19)
Figure 6
Ott 30/73