Trouble Shooting - PYD Electrobombas CX Serie Manual De Instrucciones

14. Trouble shooting

Before removing the terminal box cover and before any removal/
dismantling of the pump. Make sure the electricity supply has been
switched off and that it cannot be accidentally switchde on.
Fault
Motor does not run
when started
Motor starter overload
trips out immediately
when supply is swit-
ched on
Motor starter overload
trips out occasionally.
Motor starter has not
tripped out but the
pump does not run.
Pump capacity not
constant
Pump runs but gives
no water
Pump runs back-wards
when switched off
Leakage in shaft seal
Noise
Cause
- Supply failure.
- Fuses are blown.
- Motor starter overload has tripped out.
- Thermal protection has tripped out.
- Main contacts in motor starter are not
making contact or the coil is faulty.
- Control circuit is defective.
- Motor is defective.
- One fuse/automatic circuit breaker is blown.
- Contacts in motor starter overload are faulty.
- Cable connection is loose or faulty.
- Motor winding is defective.
- Pump Mechanically blocked.
- Overload setting is too low.
- Overload setting is too low.
- Low voltage at peak times.
- Supply failure.
- Fuses are blown.
- Thermal protection has tripped out.
- Main contacts in motor starter are not
making contact or the coil is faulty
- Control circuit is defective.
- Pump inlet pressure is too low (cavitation).
- Suction pipe/pump partly blocked by
impurities.
- Pump draws in air.
- Suction pipe/pump blocked by impurities.
- Foot or non-return valve blocked in
closed position.
- Leakage in suction pipe.
- Air in suction pipe or pump.
- Motor rotates in the wrong direction.
- Leakage in suction pipe.
- Foot or non-return valve is defective.
- Shaft seal is defective.
- Cavitation occurs in the pump.
- Pump does not rotate freely(frictional
resistance) because of the incorrect pump
shaft position
- System head and pump head ratio too low.
- Frequency converter not run.
- Connect the electricity supply.
- Replace fuses.
- Reactivate the motor protection
- Reactivate the thermal protection.
- Replace contacts or magnetic coil.
- Repair the control circuit.
- Replace the motor.
- Cut in the fuse
- Replace motor starter contacts
- Fasten or replace the cable connection
- Replace the motor
- Remove the mechanical blocking of
the pump.
- Set the motor starter correctly.
- Set the motor starter correctly.
- Check the electricity supply.
- Connect the electricity supply.
- Replace fuses.
- Reactivate the thermal protection.
- Replace contacts or magnetic coil.
- Repair the control circuit.
- Check the Suction conditions.
- Clean the pump or the pump 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.
- Repair the suction pipe.
- Repair the foot or non-return valve.
- Replace the shaft seal.
- Check the suction conditions.
- Adjust the pump shaft.
- Improve system or choose a right pump.
- Check the frequency converter operation.
11
Remedy