ARMY TM 9-6115-643-24
AIR FORCE TO 35C2-3-445-22
2.55. SHORT CIRCUIT/OVERLOAD RELAY.
2.55.1. Inspection.
a. Shut down generator set.
b. Inspect relay for cracked casing, burned or broken terminals, and other damage
2.55.2. Testing.
a. Shut down generator set.
b. Open battery access door and disconnect negative battery cable.
c. Release control panel by turning two fasteners and lower control panel slowly.
d. Tag, disconnect, and insulate the following wires from short circuit/overload relay:
Wires 111B and 111C from terminal 1.
Wires 113B and 113C from terminal 2.
Wires 115B and 115C from terminal 3.
Wires 184B and 184C from terminal 4.
e. Tag and disconnect wire 141A from terminal 1 on AC voltage regulator.
NOTE
Disconnecting wire 141A at voltage regulator terminal 1, disables volt-
age regulator and allows generator to develop very low AC output volt-
age.
f. Tag, disconnect, and isolate wire 217A from terminal 8 of overfunded voltage relay.
g. Connect a jumper wire from terminal 4 of short circuit/overload relay to terminal LO of load output terminal board.
h. Place voltage reconnection terminal board in 120/208 connection.
i. Connect negative battery cable.
j. Start generator set and operate at rated frequency.
k. Close AC CIRCUIT INTERRUPTER switch. After approximately one minute, AC circuit interrupter relay should
open and OVERLOAD lamp should illuminate on malfunction indicator panel.
l. Shut down generator set.
m. Disconnect jumper wire from terminal 1 of short circuit/overload relay and connect it to terminal 2.
n. Repeat steps j and k.
o. Shut down generator set.
p. Disconnect jumper wire from terminal 2 of short circuit/overload relay and connect it to terminal 3.
q. Repeat steps j and k.
r. Shut down generator set.
s. Disconnect jumper wire from terminal LO of load output terminal board and connect it to L2.
t. Start generator set and operate at rated frequency.
u. Close AC CIRCUIT INTERRUPTER switch. AC circuit interrupter relay should open immediately and SHORT CIR-
CUIT lamp should illuminate on the malfunction indicator panel.
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