PYD Electrobombas VERTINOX Series, Руководство по эксплуатации и техническому обслуживанию, Страница: 30 / 54

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OPERATING AND MAINTENANCE MANUAL
SERIE VERTINOX
30
Fault Cause Remedy
Motor does not run
when started
- Supply failure.
- Fuses are blown.
- Motor starter overload has tripped out.
- Th ermal protection has tripped out.
- Main contacts in motor starter are not ma-
king contact or the coil is faulty
- Control circuit is defective.
- Motor is defective
- 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
Motor starter
overload trips out
immediately when
supply is switched on
- 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.
- Cut in the fuse.
- Replace motor starter contacts.
- Fasten or replace the cable connec-
tion.
- Replace the motor.
- Remove the mechanical blocking of
the pump.
- Set the motor starter correctly.
Motor starter
overload trips out
occasionally.
- Overload setting is too low.
- Low voltage at peak times.
- Set the motor starter correctly.
- Check the electricity supply.
Motor starter has not
tripped out but the
pump does not run.
- Supply failure.
- Fuses are blown.
- Th ermal protection has tripped out.
- Main contacts in motor starter are not
making
contact or the coil is faulty
- Control circuit is defective.
- Connect the electricity supply.
- Replace fuses.
- Reactivate the thermal protection.
- Replace contacts or magnetic coil.
- Repair the control circuit.
Pump capacity not
constant
- Pump inlet pressure is too low (cavita-
tion).
- Suction pipe/pump partly blocked by
impurities.
- Pump draws in air.
- Check the Suction conditions.
- Clean the pump or the pump pipe.
- Check the suction conditions.
Pump runs but gives
no water
- 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.
- 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.
Pump runs back-
wards when switched
off .
- Leakage in suction pipe.
- Foot or non-return valve is defective.
- Repair the suction pipe.
- Repair the foot or non-return valve.
Leakage in shaft seal. - Shaft seal is defective. - Replace the shaft seal.
Noise - 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
- Check the suction conditions.
- Adjust the pump shaft .
- Improve system or choose a right
pump.
- Check the frequency converter
operation.