ARMY TM 9-6115-670-14&P
5-46
5.16. OVERLOAD RELAY.
This task covers: a. Test
b. Adjust
c. Replace
INITIAL SETUP
Tools
General Mechanic's Tool Kit
(Item 1, Appendix B)
Shop Equipment, Electrical Repair,
Semitrailer Mounted
(Item 3, Appendix B)
Materials/Parts
Overload Relay
(See Figure FO-1)
Equipment Conditions
MASTER ON-OFF switch on APU control unit set
to OFF.
Contactor mounting plate removed (para 4.52.).
TEST
a. Refer to Figure FO-1 (SICPS/WIN-T) or F0-7 (JTACS) and check for continuity between L1 and
T1, L2 and T2, and L3 and T3.
b. Using a Multi-meter, test for continuity between connections NC 95 and NC 96 on overload
relay.
c. Press TEST button on overload relay. Continuity should be broken.
d. Press RESET button on overload relay. Continuity should return.
e. If any pair of contacts fails the continuity test, the overload relay is defective. Replace overload
relay.
f. If continuity is not broken between NC 95 and NC 96, replace overload relay.
ADJUST
Adjust current limiting dial to 50 amps.
WARNING
Ensure that APU DC power supply is disconnected.
Failure to observe this warning could result in severe
injury or DEATH to personnel.
WARNING
Ensure that the APU is turned off and completely de-
energized before opening generator housing. Failure
to observe this warning could result in severe injury or
DEATH to personnel.