English (GB)
61
25. Fault finding
* In twin-head pump installations, the backup pump will often
rotate slowly.
Warning
Before removing the terminal box cover or removing
or dismantling the pump, make sure that the power
supply has been switched off for at least 5 minutes.
Make sure that the power supply cannot be
accidentally switched on.
Warning
Make sure that the escaping water does not cause
injury to persons or damage to the equipment.
Fault
Cause/remedy
1. The motor does not run when started.
a) Supply failure.
b) The fuses are blown.
c) The motor is defective.
2. Motor alarm when the power supply is switched on.
a) Supply failure.
b) The cable connection is loose or faulty.
c) The motor winding is defective.
d) The pump is mechanically blocked.
3. Occasional motor alarm.
a) The supply voltage is periodically too low or too high.
b) The differential pressure across pump is too low.
4. No motor alarm, but the pump does not run.
a) Check the power supply.
b) Check the fuses.
5. The pump performance is not constant.
a) The pump inlet pressure is too low.
b) The inlet pipe or pump is partly is blocked by impurities.
c) The pump draws in air.
6. The pump runs but delivers no water.
a) The inlet pipe or pump is blocked by impurities.
b) The foot or non-return valve is blocked in closed position.
c) There is a leakage in the inlet pipe.
d) There is air in the inlet pipe or pump.
7. The pump runs backwards when switched off.*
a) There is a leakage in inlet pipe.
b) The foot or non-return valve is defective.
c) The foot or non-return valve is blocked in open or partly open
position.
8. Leakage in shaft seal.
a) The shaft seal is defective.
9. Noise.
a) The pump is cavitating.
b) The pump does not rotate freely (frictional resistance) because of
incorrect pump shaft position.
c) There is resonance in the installation.
d) There are foreign bodies in the pump.
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