7
7.1 Contaminated pumps
Note:
If a pump has been used for a liquid which is
injurious to health or toxic, the pump will be classi-
fied as contaminated.
If GRUNDFOS is requested to service the pump,
GRUNDFOS must be contacted with details about
the pumped liquid, etc.
before
the pump is returned
for service. Otherwise GRUNDFOS can refuse to ac-
cept the pump for service.
Possible costs of returning the pump are paid by the
customer.
However, any application for service (no matter to
whom it may be made) must include details about
the pumped liquid if the pump has been used for liq-
uids which are injurious to health or toxic.
8. Fault finding chart
9. Disposal
Disposal of this product or parts of it must be carried
out according to the following guidelines:
1. Use the local public or private waste collection
service.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any haz-
ardous materials from it to your nearest GRUND-
FOS company or service workshop.
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 electri-
cian.
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 name-
plate.
b) Increased current consumption
due to large voltage drop.
Measure the voltage between mo-
tor 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
.
b) Wrong direction of rotation.
4.
Pump operates, but gives no
liquid.
a) Discharge valve closed or
blocked.
Check discharge valve and possi-
bly open and/or clean.
b) Non-return valve blocked.
Clean non-return valve.
Vent the pump.
c) Air in pump.
Subject to alterations.
