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TROUBLE, SYMPTOM
AND CONDITION
NO. 1 LOAD CONTACTOR OPERATING CIRCUIT (CONTINUED)
1. Load contactor (K1)
will not close when
control switch (20,
Fig. 1) is held in
ON position. Generator
running at
normal voltage. No
fault lights on.
(Continued)
August 5/89 Revised
PROBABLE CAUSE
(2) Defective (open)
relay in protective
module (1-1;
4, Fig. 8)
(3) Defective load
contactor control
switch (S5) (20,
Fig. 1)
(4) Defective rectifier
(CR6) (1-1;
5, Fig. 11)
(5) Defective load
contactor coil
(K1) (1-1; 6,
Fig. 11)
Trouble Shooting Chart (Sheet 13 of 20)
Figure 5
TEST, CHECK, AND/OR
REMEDY
(2) Use a jumper with clip
and prod terminals to
GROUND terminal "H" in
the test receptacle. If
contactor will now
close, replace module or
complete protective
relay tray (12, Fig. 1)
(3) Set AUTO/MANUAL switch
(S1) to AUTO position.
Connect a jumper with
test prods between terminals
"S" and "R" on the
test receptacle. If the
contactor closes, re-
place control switch.
(4) With test receptacle
terminals "S" and "R"
connected as above,
check voltage at load
contactor coil terminal
X2. If voltage is not
approximately 90-V DC,
replace rectifier.
(5) Disconnect leads at load
contactor terminals X1
and X2. Check coil resistance
between these
terminals. Resistance
should be approximately
600 ohms. If coil is
defective, replace the
OM-2031
3-1
Page 21
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