English (GB)
10
8. Fault finding chart
9. 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.
Subject to alterations.
Make sure that all power supplies have been switched off and that all rotating parts have
stopped moving before attempting to diagnose any fault.
Fault
Cause
Remedy
1.
Motor does not start. Fuses
blow or motor starter trips out
immediately.
Caution: Do not start again!
a)
Supply failure; short-circuit;
earth-leakage fault in cable or
motor winding.
Have the cable and motor checked
and repaired by a qualified
electrician.
b)
Fuses blow due to use of
wrong type of fuse.
Install fuses of the correct type.
c)
Impeller blocked by impurities. Clean the impeller.
d)
Level switch out of adjustment
or defective.
Check the level switch.
2.
Pump operates, but motor
starter trips out after a short
while.
a)
Low setting of thermal relay in
motor starter.
Set the relay in accordance with
the specifications on the
nameplate.
b)
Increased current
consumption due to large
voltage drop.
Measure the voltage between
motor phases. Tolerance: ± 10 %.
c)
Impeller blocked by impurities.
Increased current
consumption in all three
phases.
Clean the impeller.
3.
Pump operates at
below-standard performance
and power consumption.
a)
Impeller blocked by impurities. Clean the impeller.
Check the direction of rotation and
possibly interchange two phases,
see section 6.1 Direction of
rotation.
b)
Wrong direction of rotation.
4.
Pump operates, but gives no
liquid.
a)
Discharge valve closed or
blocked.
Check discharge valve and
possibly open and/or clean.
b)
Non-return valve blocked.
Clean non-return valve.
Vent the pump.
c)
Air in pump.
