Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
BACKWASH PUMP ASSEMBLY - continued
3. BACKWASH PUMP CIRCUIT BREAKER (CB2) AND/OR OVERLOAD HEATERS TRIP.
High voltages in this equipment can cause serious injury or death When applying power during a test,
take proper measures to ensure personal safety Never work on electrical equipment unless there is
another person nearby who is familiar with the operation and hazards of the equipment and who is
competent in administering first aid.
Step 1. Remove power at power source, reset circuit breaker CB2 and disconnect wires from CB2 at terminals (L1, L2
Step 2. Turn on power.
If circuit breaker CB2 trips, check for loose/bare wires and tighten connections/replace defective wire. If
Step 3. Remove power at power source, reconnect wires to CB2; if tripped, reset heater assembly; and disconnect
wires from relay K4 at T1, T2 and T3.
Step 4. Turn on power.
If heater assembly is tripped, replace defective heater (para 3-49) and reset heater assembly. If trouble
persists, replace motor starter.
Step 5. Remove power at power source and reconnect wires to heater assembly.
b. If cable assembly is not defective, repair pump assembly. Refer to paragraph 3-5.