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
19
English (GB)
Summary of Contents for MTR 1
Page 1: ...MTR 50 60 Hz IEC Installation and operating instructions GRUNDFOS INSTRUCTIONS...
Page 2: ......
Page 27: ...7 5 22 kW MG MGE TM068598 7 5 45 kW MG MGE TM068599 4 4 1 4 1 1 4 1 1 4 1 5 27 CN...
Page 32: ...7 2 1 2 1 1 TM016428 3 TM075491 4 5 6 7 8 MG MGE 32 CN...
Page 34: ...9 9 1 MG MGE 8 1 34 CN...
Page 35: ...10 8 3 1 10 1 10 2 10 3 35 CN...
Page 36: ...10 4 36 CN...
Page 37: ...10 5 10 6 10 7 IEC 60034 17 dU dt 6 2 37 CN...
Page 48: ...6 CUE OFF EN 60204 1 5 3 2 3 6 1 90 4 270 o 180 o 90 o 0 o TM004257 1 2 3 4 5 48 KO...
Page 50: ...2 1 1 TM016428 3 TM075491 4 5 6 7 8 MG MGE 50 KO...
Page 52: ...9 9 1 MG MGE 8 1 52 KO...
Page 53: ...10 8 3 1 10 1 10 2 53 KO...
Page 54: ...10 3 10 4 54 KO...
Page 55: ...10 5 10 6 10 7 IEC 60034 17 dU dt 6 2 55 KO...
Page 70: ...10 8 3 1 10 1 10 2 10 3 70 TW...
Page 71: ...10 4 71 TW...