Hobart 9OC24S Operation Manual page 240

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$MOTOR GENERATOR DIVISION
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HOBART BROTHERS COMPANY
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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO, 5381A
ROUBLE ,SYMPTOM,
AND CONDITIONS
PROBABLE CAUSE TEST, CHECK, AND/OR REMEDY
LOAD CON TACTOR OPERATIN G CIRCUIT (CON TIN UE D)
3. (Continued) C. Fuse (2FU) (38, Fig. 1)
C. Press the lens housing of fault
in protective relay tray
indicating lights. If lights will
is "blown 'I.
not glow, replace fuse (2FU)
(36, Fig. 1).
D. A fault has developed in
D.
If the load contactor cannot be
the load contactor hold-
closed by operation of the con-
ing circuit trol switch (5s) (17, Fig. 1),
check the circuit in accordance
with instructions in Trouble 1,
above under LOAD CON-
TACTOR OPERATING CIRCUIT
If the load contactor can be
closed, but opens as soon as
control switch (5s) is released,
check for trouble under
Trouble 2, above.
\IOTE: The protective relays and protective monitor are not completely functional unless
the load contactor is CLOSED.
Since it is not advisable to vary voltages for test
purposes while delivering power to an aircraft, the generator set should be con-
nected to a load bank for trouble shooting the protective circuits. If a load bank
is not available, a closed contactor can be simulated by connecting a jumper lead
between terminals B15 and 816, Fig.
3. This jumpering wi II by-pass the smal I
contacts in the load contactor and supply 12-V DC to the protective relays and
to the solid-state circuitry of the protective monitor.
Connect the generator
set to a load bank or use a jumper as described above
for the following trouble checks (Trouble 1 through 5).
ZAUTION :
DO NOT CONNECT OUTPUT CABLE TO AIRCRAFT WHILE LOAD
CONTACTOR IS JUMPERED.
!
.
3-2
IrOUble
3hooting
Lhart (3heet 14 ot IY)
Figure
6
Ott 30/73
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