Troubleshooting; Disposal - Grundfos CR-H Serie Instrucciones De Instalación Y Funcionamiento

15. Troubleshooting

Warning
Before removing the terminal box cover and before removing/dismantling the pump, make sure that the power
supply has been switched off and that it cannot be accidentally switched on.
Fault Cause
1. Motor does not run a) Supply failure.
when started.
b) Fuses are blown.
c) Motor-protective circuit breaker has tripped out.
d) Thermal protection has tripped out.
e) Main contacts in motor-protective circuit breaker
f)
g) Motor is defective.
2. Motor-protective circuit a) One fuse/automatic circuit breaker is blown.
breaker trips out
b) Contacts in motor-protective circuit breaker are
immediately when
supply is switched on.
c) Cable connection is loose or faulty.
d) Motor winding is defective.
e) Pump mechanically blocked.
f)
3. Motor-protective circuit a) Motor-protective circuit breaker setting is too
breaker trips out
occasionally.
b) Low voltage at peak times.
4. Motor-protective circuit a) Check 1 a), b), d), e) and f).
breaker has not tripped
out but the pump does
not run.
5. Pump performance not a) Pump inlet pressure is too low (cavitation).
constant.
b) Suction pipe/pump partly blocked by impurities.
c) Pump draws in air.
6. Pump runs but gives no a) Suction pipe/pump blocked by impurities.
water.
b) Foot or check valve blocked in closed position.
c) Leakage in suction pipe.
d) Air in suction pipe or pump.
e) Motor runs in the wrong direction of rotation.
7. Pump runs backwards a) Leakage in suction pipe.
when switched off.
b) Foot or check valve is defective.
8. Leakage in shaft seal. a) Shaft seal is defective.
9. Noise. a) Cavitation.
b) Pump does not rotate freely (frictional
c) Frequency converter operation.

16. Disposal

This product or parts of it must be disposed of in an
environmentally sound way:
1. Use the public or private waste collection service.
2. If this is not possible, dispose of the product according to local
regulations. Grundfos recommends that the products are
recycled whenever possible.
18
are not making contact or the coil is faulty.
Control circuit is defective.
faulty.
Motor-protective circuit breaker setting is too
low.
low.
resistance) because of incorrect pump shaft
position.
Remedy
Connect the power supply.
Replace fuses.
Reactivate the motor-protective circuit breaker.
Reactivate the thermal protection.
Replace contacts or magnetic coil.
Repair the control circuit.
Replace the motor.
Replace the fuse/cut in the circuit breaker.
Replace motor-protective circuit breaker contacts.
Fasten or replace the cable connection.
Replace the motor.
Remove the mechanical blocking of the pump.
Set the motor-protective circuit breaker correctly.
Set the motor-protective circuit breaker correctly.
Check the power supply.
Check the suction conditions.
Clean the suction pipe/pump.
Check the suction conditions.
Clean the suction pipe/pump.
Repair the foot or check valve.
Repair the suction pipe.
Check the suction conditions.
Change the direction of rotation of the motor.
Repair the suction pipe.
Repair the foot or check valve.
Replace the shaft seal.
Check the suction conditions.
Adjust the pump shaft/shaft seal setting.
See Service instructions.
See section 9.3 Frequency converter operation.
Subject to alterations.