Fault Cause Remedy
5. The temperature in the pump or
motor is too high.
a) There is air in the inlet pipe or
pump.
Vent the inlet pipe or the pump and
replenish.
b) The inlet pressure is too low.
Increase the liquid level on the inlet
side. Open the isolating valve in
the inlet pipe. Make sure that all
the conditions in section Pipes are
complied with.
c) The bearings are lubricated with
too little, too much or unsuitable
lubricant.
Replenish, reduce or replace the
lubricant.
d) The axial pressure is too high.
Check the relief holes of the
impeller and the lock rings on the
inlet side.
e) The motor-protective circuit
breaker is defective or the setting is
incorrect.
Check the setting of the motor-
protective circuit breaker and
replace, if necessary.
f) The motor is overloaded. Reduce the flow rate.
Related information
5.5.1 Pipe installation
6.5 Frequency converter operation
39
English (GB)
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