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10. Fault finding
Warning
Before starting work on the pump, make
sure that the power supply has been
switched off and that it cannot be
accidentally switched on.
Fault
1.
Motor does not run
when power supply
is switched on.
2.
Motor-protective
circuit breaker trips
out immediately
when power supply
is switched on.
3.
Motor-protective
circuit breaker trips
out occasionally.
4.
Motor-protective
circuit breaker has
not tripped out but
the pump does not
run.
5.
Pump runs but gives
no liquid or pump
capacity is not
constant.
11. 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, contact the nearest
Grundfos company or service workshop.
12
Cause
a)
Supply failure.
b)
Fuses are blown.
c)
Motor-protective circuit breaker
has tripped out.
d)
Main contacts in motor-protective
circuit breaker are not making
contact or the coil is faulty.
e)
Control circuit is defective.
f)
Motor is defective.
a)
Fuse on one phase is blown.
b)
Contacts in motor-protective circuit
breaker are faulty.
c)
Cable connection is loose or faulty. Fasten or replace the cable connection.
d)
Motor winding is defective.
e)
Pump mechanically blocked.
f)
Overload setting is too low.
a)
Overload setting is too low.
b)
Low voltage at peak times.
a)
Check 1 a), b), d) and e).
a)
Pump inlet partly blocked by
impurities.
b)
Liquid level in tank too low.
c)
Pump rotates in the wrong
direction.
Remedy
Connect the power supply.
Replace fuses.
Reactivate the motor protection.
Replace contacts or magnetic coil.
Repair the control circuit.
Replace the pump.
Replace fuse.
Replace contacts in motor-protective
circuit breaker.
Replace the pump.
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.
Clean the inlet.
Increase the liquid level.
Change the direction of rotation of the
motor by switching any two of the
phases.
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