Troubleshooting - Feedwater Pump - FULTON RB Series Installation, Operation And Maintenance Manual

MAINTENANCE - 4
4.12.2 TROUBLESHOOTING
Problem
FEEDWATER PUMP
Pump will not run
Motor starter overload,
trips out immediately
when supply is
switched on.
Motor contactor
overload trips out
occasionally.
Motor contactor has
not tripped out but the
pump does not run.
Pump capacity not
constant.
Pump runs but gives
no water.
Page 50
Cause
1. Supply failure.
2. Fuses/Circuit Breakers are blown.
3. Motor contactor overload has
tripped out.
4. Contactors not making
5. Control circuit is defective.
6. Motor is defective.
1. One fuse/automatic circuit breaker is
blown.
2. Contacts in motor contactor overload
are faulty.
3. Cable connection is loose or faulty.
4. Motor winding is defective.
5. Pump blocked.
6. Overload setting too low.
1. Overload setting is too low.
2. Low voltage at peak times.
1. Pump inlet pressure is too low
(cavitation).
2. Suction pipe/pump partly blocked.
3. Pump draws in air.
1. Suction pipe/pump blocked.
2. Foot or non-return valve blocked in
closed position.
3. Leakage in suction pipe.
4. Air in suction pipe or pump.
5. Pump rotates in the wrong direction.
6. Boiler feedwater non-return valve
letting water passed the valve seat,
FEEDWATER PUMP
Remedy
Connect the electricity supply.
Replace fuses/Circuit Breakers.
Reactivate the motor protection.
Check, the coil is faulty or wiring loose.
Repair the control circuit.
Replace the motor.
Replace the fuse, reset the circuit
breaker.
Replace motor starter contacts.
Tighten or replace the cable connection.
Replace the motor.
Remove the blockage.
Set the motor starter correctly.
Set the overload correctly.
Check the electricity supply.
Check :
Motor does not run when started:
items: 1, 2, 4, 5, 6,
Check the suction conditions.
Clean the pump or suction pipe.
Check the suction conditions.
Clean the pump or suction pipe.
Repair the foot or non-return valve.
Repair the suction pipe.
Check the suction conditions.
Change the direction of rotation of the
motor.
Check and clean boiler feedwater
non-return valve, ensure it is seating
(normally and not allowing water passed.
accompanied by banging in the feedwater
tank).
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RB-RBC-IOMM-2015-1
Fulton Ltd