10.5 The pump runs but gives no liquid, or the pump performance is not constant
Cause Remedy
The pump strainer is partly blocked by impurities. Clean the strainer.
The liquid level in the tank is too low. Increase the liquid level.
The pump draws in air. Check the inlet conditions.
10.6 Leakage from the shaft seal
Cause Remedy
The shaft seal is defective. Replace the shaft seal.
10.7 Noise
Cause Remedy
Cavitation. Check the inlet conditions.
The pump does not rotate freely because of an
incorrect pump shaft position (frictional resistance).
Adjust the pump shaft.
Frequency converter operation. Frequency converter operation may cause increased
acoustic noise from the motor
. Make sure to protect the
motor against voltage peaks and dU/dt according to IEC
60034-17.
For noise-critical applications, fit an output filter between
the motor and the frequency converter to reduce the
voltage peaks. For particularly noise-critical
applications, fit a sinusoidal filter.
See Grundfos recommendations in the section on
frequency converter operation.
Related information
6.2 Frequency converter operation
20
English (GB)
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