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TROUBLE
SYMPTOM
AND
CONDITION
PROBABLE
CAUSE
TEST,
CECK,
AND/OR
REMEDY
NO.
1 LOAD
CONTACTOR
OPERATING
CIRCUIT
(CONTINUED)
1. Load contactar
(2)
Defective
(open) relay
(K?) will
not
(2)
Use a junper
with
clip and
in protect.ive
module
prod ten
inals to GRCIJ ND
close when con-
(l-l;
4,
Fig.
10)
terminal
"H"
in the test
trol switch
(20,
receptacle.
If contactar
will
Fig.
1) is held in
naw
close,
replace module or
ON
position.
complete
protective
relay tray
Generabr
running
(12,
Fig.
1).
at normal volt&e.
Na fault
lights
(3)
Defective
load con-
(3)
Set AUTO/MANUAL
switch
on.
(Continued)
tactor control switch
(S?) to AUTO
position.
(95) (20,
Fig.
1)
Connect
a jumper with
test
prods Between
terminals
"S"
and "R" on the test receptacle,
If the contactor
closes,
replace
contra I sw itch.
(4)
Defective
rectifier
(4)
With
test receptacle
terminals
((36)
(l-l;
5,
Fig.
13)
'5"
and "R" connected
as
above,
check voltage
at load
contactor coil
terminal
X2.
If voltage
is not approximately
90-V
DC,
replace
rectifier.
(5)
Defective
lo&
con-
(5)
Disconnect
leads at load con-
tactor coil (Kl)
tactor
terminals
Xl
and X2.
(l-l;
6,
Fig.
13)
Check coil
resistance
between
these terminals.
Resistance
shoukl
be approximately
600
ohms.
If coil
is defective,
replace the complete
load
contactor.
Trouble
Shooting
Chart (Sheet
14 of 21)
Figure
9
3-l
Page 28
AUg
25185
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