Fault Finding The Product; The Motor Does Not Run When Started; Periodic Checks - Grundfos MTR Montage- Und Betriebsanleitung

10. Fault finding the product

WARNING
Electric shock
Death or serious personal injury
‐
Switch off the power supply before you
start any work on the product.Make
sure that the power supply cannot be
switched on accidentally.
WARNING
Moving parts
Death or serious personal injury
‐
Tighten the coupling screws to the cor-
rect torque.
‐
Install the coupling guards securely to
the pump with the screws intended for
this purpose.
CAUTION
Corrosive liquids
Minor or moderate personal injury
‐
Wear personal protective equipment.
CAUTION
Toxic liquids
Minor or moderate personal injury
‐
Wear personal protective equipment.

10.1 The motor does not run when started.

Cause
Power supply failure.
One or more fuses are blown.
The motor-protective circuit breaker has tripped.
The thermal protection has tripped.
The main contacts in the motor-protective circuit
breaker are not making contact, or the coil is faulty.
The control circuit is defective.
The motor is defective.
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CAUTION
Hot or cold liquid
Minor or moderate personal injury
‐
Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
‐
Make sure that no one can accidentally
come into contact with hot or cold sur-
faces.
Related information
8.3.1 Periodic checks
Remedy
Connect the power supply.
Replace the fuses.
Reactivate the motor-protective circuit breaker.
Reactivate the thermal protection.
Replace the contacts or the magnetic coil.
Repair the control circuit.
Replace the motor.