TM 5-6115-593-12
TO 35C2-3-463-1
Table 5-6. Automatic Control Module Troubleshooting (Organizational Level)-Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 1. If NORMAL POWER AVAILABLE indicator lamp is lit, inspect (using a multimeter set to measure AC) for
120V AC across Undervoltage Device 27/59N relay 6-5 contacts.
If 12.OV AC is present, refer testing and replacement of 27/59N relay to next higher level of maintenance.
If 120V AC is absent, refer testing and replacement of TD relay to next higher level of maintenance.
Step 2. If NORMAL POWER AVAILABLE indicator lamp is not lit, refer testing and replacement of RR relay to
higher level of maintenance.
3.
GENERATOR MAIN CIRCUIT BREAKER DOES NOT CLOSE DURING EMERGENCY SWITCHOVER (SINGLE
UNIT OPERATION).
NOTE
Generator set operation is assumed to be normal.
Step 1. Using a multimeter (set to measure DC), inspect for 24V DC across TB3-1 and TB3-2.
If 24V DC is present, refer testing and replacement of MR relay to higher level of maintenance.
If 24V DC is absent, proceed to next step.
Step 2. Connect a jumper across TB4-1 and TB3-1.
4.
GENERATOR OUTPUT DOES NOT CONNECT TO CRITICAL LOAD (LRI).
Using a multimeter (set to measure DC) check for 24V DC at coil of LR1 relay.
If present, refer to testing and replacement of LRI relay to next higher level of maintenance.
If absent connect a jumper from TB4-1 to R1 diode pack terminal 5.
If critical load is activated, refer testing and replacement of BR1 relay to next higher level of maintenance.
If jumper does not correct problem, remove jumper and refer testing and replacement of R1 diode pack
assembly to next higher level of maintenance.
5-19
