TM 10-4610-241-24
TO 40W4-13-42
Table 2-2. Unit Troubleshooting-continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BACKWASH PUMP ASSEMBLY - continued
4.
BACKWASH OPERATION FAILS TO STOP.
Step 1. Models WPES-10, WPES-20 and WPES-30:
Check if timer is tripped (reset switch popped out).
a.
If timer is tripped, press reset switch. If it keeps tripping, replace timer. Refer to Paragraph 2-68.
b.
If timer is not tripped, go to step 3.
Step 1.
Models H-9518-1, H-9518-2, and H-9518-3:
Check if circuit breaker on timer is tripped.
a.
If timer is tripped, reset the circuit breaker. When circuit breaker is reset, timer should continue and then
stop the unit. If this does not happen, replace the timer. Refer to Paragraph 2-68.1.
b.
If timer is not tripped, go to step 3.
Step 2.
Restart backwash operation (Models WPES-10, WPES-20 and WPES-30).
If timer trips again, replace timer. Refer to Paragraph 2-68.
WARNING
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 3.
Check for 115 VAC on terminal board (vertical on Models WPES-10, WPES-20 and WPES-30, horizontal on
Models H-9518-1, H-9518-2, and H-9518-3), contacts 1 and 2 (ground) in timer.
a.
If voltage is not measured, notify Direct Support Maintenance.
b.
If voltage is measured, replace timer. Refer to Paragraph 2-68.
5.
BACKWASH PUMP ASSEMBLY STOPS DURING AND/OR FAILS TO START IN BACKWASH
OPERATION.
Step 1,
Check if circuit breaker, CB2 and/or heater assembly of K2 motor starter are tripped. TRIPPED window in
heater assembly of motor starter K2 will indicate white, if heater assembly is tripped.
If CB2 and /or heater assembly are tripped, go to step 2 of Malfunction 3, Backwash Pump Assembly.
2-52 Change 1
