Maintenance And Service; Fault Finding - Grundfos MS Montage- Und Betriebsanleitung

8. Maintenance and service

The motors are maintenance-free.
All motors are easy to service.
Service kits and service tools are available from
Grundfos.
The motors can also be serviced at a Grundfos
service centre.
Warning
If a motor has been used in a liquid
which is injurious to health or toxic,
the motor will be classified as
contaminated. Clean the motor properly
before starting service. Be aware that
the motor liquid may also be
contaminated.
If you want Grundfos to service the motor, you must
contact Grundfos with details about the possible
contamination, etc. before you dispatch the motor.
Otherwise, Grundfos may refuse to accept the motor
for service.
Any costs of returning the motor must be paid by the
customer.

9. Fault finding

Fault
1. The motor does
not run.
Cause
a) The fuses are blown.
b) The ELCB or the voltage-
operated ELCB has tripped.
c) No power supply.
d) The motor-protective circuit
breaker has tripped.
e) Motor-protective circuit breaker/
contactor is defective.
f) Starter device is defective.
g) The control circuit has been
interrupted or is defective.
h) The pump/submersible drop
cable is defective.
Remedy
Replace the blown fuses. If the new ones
blow too, check the electrical installation
and the submersible drop cable.
Cut in the circuit breaker.
Contact the power supply company.
Reset the motor-protective circuit breaker
(automatically or possibly manually). If it
trips again, check the voltage. If the voltage
is OK, see items e) - h).
Replace the motor-protective circuit
breaker/contactor.
Repair/replace the starter device.
Check the electrical installation.
Repair/replace the pump/cable.
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