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OM 2012 :.
I.
light
(DS3Y)
ON
j.
Load contactor
O~RS
durii>g
power delivery.
Overlmd
indi-
cating
Ii&t
ON,
A. E fzc:i.iG gavcrllor
impra;->-
er ly *di!,st?d,
or ma I-
fun& ion ing
.
(1) Governor
improper Iy
adjusted
(2) E lectrtc
governor
system rna!functioning
6. Defective
over-undzr-
frequency
sensing
module
627)
A. Thkre
may have been an
over load condition
which
caused .the
over
load
device
(K4) to functicn
normally.
B. One of the
res ktcrs
(1X26,
R27,
OF R28) acrrxs
over-
load transformers
is open
circuited.
/ C. Over load device
printed
circuit
board defective
Trouble
Shooting
Chart
(Sheet
1'
Figure
9
--
-
(1)
Adjls;st In accc;:d,rncc with
Sect.
2-3,
Fora.
4., E,
(3).
(2)
Check and odjusf o: repsir
in accordance
with E N G !i\? E
AND
COl\rTGO1S,
Troubles
8 and 9.
3. If underfrequency
nuisance
tr ippins
continues
after
the governar
system
is proven to be good,
and an under
frequency
condition
does not exist,
replace
over-uaderfrcqrrency
relay,
or complete
protective
relay
tray.
.
4. Observe
ammeter
(4,
Fig.
1).
Check fcr abncrmai
overload
con-
dition
and correct.
If overlbad
device functions
to open the load
contactor
when an overtaad dces
not exist,
proceed to step 8.
I. An open resistor
wiii
case
a
higher
than normal voltage.
Check
resistors
(Sect.
l-l;
1, Fig.
13).
Replace
if dafective.
1. Check voltcge
at terminal
E,
Fig.
8.
If 12-V
DC,
replace
over load
device
(K4)
(Sect.
l-l;
7,
Fig.
1;3
3f
21)
3-1
Page 33
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