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12. Maintenance and service
If Grundfos is requested to service a contaminated motor,
Grundfos must be contacted with details about the pumped liquid,
etc. before the motor is returned for service. Otherwise Grundfos
can refuse to accept the motor for service.
Possible costs of returning the motor are paid by the customer.
12.1 Fault finding
Warning
If a motor has been used in a liquid which is
injurious to health or toxic, the motor will be
classified as contaminated.
Fault Cause Remedy
1. The motor does not
run.
a) No power supply. Replace the fuses. Check the electrical installation and the
submersible drop cable if the new fuses burn too.
b) The ELCB or the voltage-operated
ELCB has tripped out.
Cut in the circuit breaker.
c) Motor-protective circuit breaker has
tripped.
Cut in the motor-protective circuit breaker (takes places
automatically or must be done manually). Check the voltage if
the motor-protective circuit breaker trips again. If the voltage is
okay, see the items e) to h).
d) Motor-protective circuit
breaker/contactor is defective.
Replace the motor-protective circuit breaker/contactor.
e) Starter device is defective. Repair/replace the starter device.
f) The control circuit has cut out or is
defective.
Check the electrical installation.
g) Motor/drop cable is defective. Repair/replace the motor/drop cable.
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