PYD Electrobombas CX Serie Manual De Instalación Y Mantenimiento página 11

OPERATING AND MAINTENANCE MANUAL
HORIZ. CENTRIFUGAL ELECTRIC PUMP CX SERIES
FAULT
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
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CAUSE
- 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 (cavita-
tion).
- 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 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 opera-
tion.
11
SOLUTION ENG