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. Loud cr,nklctcf
open: c&x ing pcW!r
de I ivory.
Over-
frequsncy
indicating
light
(DS40)
CN
T
1. Defective
protective
monitor
module (KI4)
. E lectric
governor
improper I;
adiL5ted,
oh nutfunctioning
(1) Gavernor
improperly
adi usted
(2) E lectr'ic governor
system malfunctioning
Defective
over-under-
' frequency
sensing
module
(K27)
---
~.-
-me--
13. UX
J:ccztat
(37,
F&
1) tr> re-
duz
vrol:ugz
to IOr, V.
I'!:e
unc!zrvoI!~qc
indicutlng
I ir;!,t
sh XI Id N 01'
come on during
a I-imr! de lay of 4. to 12 secc.nd< .
If the light comes on before a
delay of 4 to 12 seccnds,
thy'
underltoltage
relay
is defect;l:e.
Replclce the module (K26)
cz- the
protective
relay
tray.
C. With
unit running
nH:imIty,
use
rheostat
(37,
Fig.
1) to reduce
voltage
quickly
to 90 V.
If the
undervoltage
indicating
1 i&t
(DS38)
is turned
ON
immediateI>
the protective
monifor
circuitry
is defective.
Replace
the pro-
tective
mpnitor
(Kl4)
or rep!cce
the potective
relay
trajr.
A. Proceed as foIlows:
'
(1) Adjust
in accordance
with
Sect.
2-3,
Para.
4, E,
(3).
(2)Check
and adjust
or repair
in act ordance with E NG IblE
AND
CONTKOLS,
Tro&!es
8 and 9.
3. If overfrequency
nuisance
trippi%
continues
after
the governor
system
is proven to be good,
and
an overfrequency
condition
does
not exist,
replac,. 0 the over-under
frequency
module (K27),
or com-
plete protective
relay
tray.
-_.
Trouble
Shooting
Chart
(She&t
18 of 21)
-
3-1
Page 32
Figure
9
Aug 25%
.
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