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,
I
OPERATION,
MAINTENANCE,
AND
OVERHAUL
MANUAL,
TM-240A
SELF-PROPELLED
GENERATOR
SET,
SFEC.
NO.
5381A
TROUBLE,SYMPTOM
AND
CONDITIONS
PROBABLE
CAUSE
TEST,
CHECK,
AND/OR
REMEDY
PROTECTIVE
CIRCUIT
(CONTINUED)
4.
(Continued)
A.
(Continued)
A.
(Continued)
(2)
E lectric
governor
(2)
Check and adjust or repair
system malfunction-
in accordance with E NGI N
ing
AND
CONTROLS,
Trouble
no. 8.
B.
Defective
unde rfreq uency
B.
If underfrequency
nuisance
trip-
sensing
relay
(UF)
ping continues
after the govern-
or system was proven to 'be good,
and an under-frequency
conditior
does not exist,
replace the
underfrequency
relay (l-l;
4,
Fig.
7) or the protective
relay.
tray.
5.
Load contactor
A.
There may have been an
A.
Press reset switch
(39,
Fig.
1)
opens during
overload
condition
which
power de I ivery.
and resume power delivery.
caused the overload
de-
Observe
ammeter (32,
Fig.
1).
Overload
indicat-
vice
(OL)
to function
Check for abnormal overload
ing light
ON.
normally.
condition
and correct.
If over-
load device
functions
to open
the load contactor
when an
overload
does not exist,
proceed
to step B.
B.
One of the resistors
B.
An open resistor
will
cause a
(8RES,
9RES,
or IORES)
higher
than normal voltage.
across overload
trans-
Check resistors
(l-l,
Fig.
10,
fanners
is open circuited.
item 2).
Replace
if defective.
C.
Overload
device
printed
C.
Check voltage
at terminal
B14,
circuit
board defective
Fig.
3.
If 12-V
DC,
replace
overload
device
(01)
(l-l,
Fig.
10,
item 8).
GENERATOR
1. No (or low)
voltage
0 utput
A.
Shorted
diode
in exciter
A.
Check diodes
in accordance
rectifier
(1 REC)
with
2-3,
Para.
2,C.
If
diodes are good,
proceed to
Step B.
Ott
30[73
Rev ised Fe b 22/78
.._ - -_ __ - _ _
Trouble
Shooting
Chart
(Sheet
17 of 19)
Figure
6
3-2
Page 27
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