ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
2-31. SHORT CIRCUIT/OVERLOAD RELAY.
2-31-1. Inspection.
a.
Shut down generator set.
b.
Release control panel by turning two fasteners and lower control panel slowly.
c.
Inspect relay for cracks, burned or broken connections, corrosion, and other damage.
d.
Raise and secure control panel.
2-31-2. Testing.
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
I.
m.
n.
o.
p.
q.
r.
s.
t.
u.
Shut down generator set.
Open left side engine access door and disconnect negative battery cable.
Release control panel by turning two fasteners and lower control panel slowly.
Tag, disconnect, and insulate the following wires from short circuit/overload relay:
Wires 164C and 164B from terminal 1.
Wires 165C and 165B from terminal 2.
Wires 166C and 166B from terminal 3.
Wires 167G and 167D from terminal 4.
Tag and disconnect wire 104C from terminal 6 on AC voltage regulator.
NOTE
Disconnecting wire 104C at AC voltage regulator terminal 6, disables AC voltage regula-
tor and allows generator to develop very low AC output voltage.
Connect a jumper wire from terminal 4 of short circuit/overload relay to terminal LO of load output terminal
board.
Place voltage reconnection switch in 120/208 position.
Obtain low AC voltage with a jumper wire between L1 of load output terminal board and terminal 1 of short
circuit/overload relay.
Connect negative battery cable and dose access door.
Start generator set and operate at rated frequency.
Close AC CIRCUIT INTERRUPTER switch. After approximately one minute, AC circuit interrupter relay should
open and OVERLOAD lamp should illuminate on malfunction indicator panel.
Shut down generator set.
Disconnect jumper wire from terminal 1 of short circuit/overload relay and connect it to terminal 2.
Repeat steps j and k.
Shut down generator set.
Disconnect jumper wire from terminal 2 of short circuit/overload relay and connect it to terminal 3.
Repeat steps j and k
Shut down generator set.
Move jumper wire from terminal LO of load output terminal board and connect it to L2 Apply low AC voltage
obtained with jumper wire between L1 of load output terminal board and terminal 3 of short circuit/overload
relay.
Start generator set and operate at rated frequency.
Close AC CIRCUIT INTERRUPTER switch. AC circuit interrupter relay should open immediately and SHORT
CIRCUIT lamp should illuminate on the malfunction indicator panel.
2-58 Change 2
