KRAL KV - Page 39

14 Troubleshooting
14.2 Troubleshooting
Fault identification Cause Remedy
– 2 – 4 – – – 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.
– 2 3 – 5 – – Overflow valve opens during normal operation
Set the opening pressure to 110% of the differential pressure Ä During opera-
tion,Page24.
– 2 – – 5 – – Overflow valve leaks
Contact the manufacturer.
– 2 – – – – – Advanced wear of the housing/screw set
Contact the manufacturer.
– – 3 – – – – Pump subject to mechanical stress
Connect the pump correctly to the pipe system Ä Connection,Page18.
– – 3 – – – – Vibrations/pulsations in the system
Bear the pump unit elastically.
-or-
Make the connections with hoses.
– – 3 – – – – 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.
– – 3 4 – – 7 Ball bearing damaged
Replace the ball bearing Ä Servicing,Page29.
– – – 4 – – 7 Foreign bodies in the pump
Contact the manufacturer.
– – – – – – 7 Differential pressure is too high and has overloaded the idle screws
Contact the manufacturer.
– – – – – – 7 Viscosity is too low and has overloaded the idle screws
Contact the manufacturer.
1 2 3 4 – – 7 Pump damaged through dry running
Contact the manufacturer.
1 – – – – – – Pump does not vent
Vent the pressure line at the highest point.
– 2 3 – – – – Magnetic coupling interrupted
1. Stop the pump immediately and restart it.
2. Avoid excessive differential pressures.
3. At repeated occurrence check whether pump has got stuck.
1 – – – – – 7 Containment can defective
Replace the containment can Ä Servicing,Page29.
Tab.12: Fault table
Operating instructions
OIK 09en-GB Edition 2019-11
39