Table of Contents
Advertisement
OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
No. 2 Load Contactor Operating Circuit
Trouble, Symptom & Condition
2. Load contactor (K1) will close
when control switch (21, Fig. 1
is held in momentary CLOSE
position. Opens immediately
when switch is released to
center ON position.
Chapter 3-1
Page 28
Probable Cause
a. 28.5-V DC is not reaching
plug-interlock relay (K2)
from aircraft for the
following reasons:
b. Generator to aircraft cable
connector defective or not
plugged into aircraft
receptacle connector.
c. Aircraft rejecting power.
d. "Blown" fuse (F2) (1-1; 17,
Fig. 9) in protective relay
tray.
e. Defective plug-interlock
relay (K2).
f. Small contacts in load
contactor (K201) defective.
g. Defective fuse interlock
relay (K217) or resistor
(R246).
Corrective Action
Check voltage at terminal Z on
test receptacle. Voltage should be
28.5-V DC. If not, voltage is not
being supplied from aircraft.
Check causes as follows:
Inspect cable connector plug
thoroughly for damaged E and F
terminals. Be sure the plug is fully
mated with the aircraft
receptacle connector and making
good contact.
Check aircraft on board electrical
equipment and controls.
Press lamp test switch (8, Fig. 1).
If lamps do not glow, replace fuse
(F2).
Place test-bank switch (S2) (34,
Fig. 1) in ON position. If load
contactor will now remain closed,
replace the plug-interlock relay
(K2) (Sect. 1-1; 1, Fig. 9) or the
complete protective relay tray.
Connect a jumper lead between
small terminals #1 and #2 on the
load contactor. If the load
contactor will now remain closed,
replace the complete load
contactor (K201).
Open protective relay tray and
connect a jumper across the
resistor (R246) (Sect. 1-1, Fig.
15). If the contactor will now
remain closed, replace fuse
interlock relay (K217) (Sect. 1-1,
Fig 15).
March 31/94 Revised
Advertisement
Table of Contents
