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14 Troubleshooting
14.2 Troubleshooting
Fault identification
Cause
Remedy
1
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Too little pumped liquid in the pump
Fill the pump with pumped liquid.
1
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Incorrect pump direction of rotation
Swop the two electrical connection phases
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4
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Differential pressure too high
Reduce the differential pressure.
1
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3
4
5
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Viscosity of the pumped liquid too high
Increase the temperature of the pumped liquid.
-or-
Decrease the speed.
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2
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Viscosity of the pumped liquid too low
Reduce the temperature of the pumped liquid.
-or-
Increase the speed.
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2
3
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5
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Airlock/gas in the pumped liquid
1.
Test the pipe system for air admission, replace leaking parts.
2.
Reduce the suction head.
-or-
Increase the inlet pressure.
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2
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4
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Speed/frequency/voltage of the motor false
1.
Ensure that the motor frequency and voltage match the operating voltage.
2.
Ensure that the speed of the motor matches the rating plate of the pump. If necessary ad-
just the speed.
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2
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5
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Overflow valve leaks
Contact the manufacturer.
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2
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Advanced wear of the housing/screw set
Contact the manufacturer.
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7
Advanced wear of sealing surfaces
Replace the seal and check the pumped liquid for abrasive substances. If required, re-
place the filter/strainer.
-or-
Contact the manufacturer.
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3
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Coupling aligned incorrectly
Assemble the coupling and motor correctly
Ä
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3
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Pump subject to mechanical stress
Connect the pump correctly to the pipe system
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3
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Vibrations/pulsations in the system
Bear the pump unit elastically.
-or-
Make the connections with hoses.
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3
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Flow speed in the pressure line or suction line too high
Set the flow speed in the pressure line so that it does not exceed 3 m/s.
-or-
Set the flow speed in the suction line so that it does not exceed 1 m/s.
-or-
Contact the manufacturer.
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3
4
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7
Ball bearing damaged
Replace the ball bearing
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2
3
4
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7
Superficial damage to pump parts coming into contact with the liquid
Contact the manufacturer.
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7
Shaft seal damaged through dry running
Replace the shaft seal
50
OIC 18en-GB Edition 2020-01
Operating instructions