Table 3-1. Direct Support Troubleshooting - continued
TEST OR INSPECTION
BACKWASH PUMP ASSEMBLY - continued
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 safety of personnel. Never work on
electrical equipment unless there is another person nearby who is familiar with the
operation and hazards of the equipment.
Step 1. Remove power at power source, reset circuit breaker CB2 and disconnect wires from CB2 at terminals
(L1, L2 and L3).
Step 2. Turn on power at power source and momentarily flip pump switch to START.
If circuit breaker CB2 trips (TRIPPED window shows white), check for loose/bare wires and tighten
connections/replace defective wire. If trouble persists, replace circuit breaker. Refer to Paragraph 3-53.
Step 3. Remove power at power source; reconnect wires to CB2; if tripped, reset heater assembly; and
disconnect pump cable at junction box connector.
Step 4. Turn on power at power source and momentarily flip pump switch to START.
If heater assembly is tripped, replace defective heater (Paragraph 3-61) and reset heater assembly. If
trouble persists, replace motor starter.
Step 5. Disconnect pump cable at pump motor and check continuity of pump cable assembly (Paragraph 2-16).
If cable assembly is shorted, repair it. Refer to Paragraph 3-7.
If cable assembly is not shorted, repair pump assembly. Refer to Paragraph 3-8.