Fault Finding Chart; Disposal - Grundfos AP65 Montage- Und Betriebsanleitung

8. Fault finding chart

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
1. Motor does not start. Fuses
blow or motor starter trips out
immediately.
Caution: Do not start again!
2. Pump operates, but motor
starter trips out after a short
while.
3. Pump operates at below-
standard performance and
power consumption.
4. Pump operates, but gives no
liquid.

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.
Cause
a) Supply failure; short-circuit;
earth-leakage fault in cable or
motor winding.
b) Fuses blow due to use of wrong
type of fuse.
c) Impeller blocked by impurities.
d) Level switch out of adjustment
or defective.
a) Low setting of thermal relay in
motor starter.
b) Increased current consumption
due to large voltage drop.
c) Impeller blocked by impurities.
Increased current consumption
in all three phases.
a) Impeller blocked by impurities.
b) Wrong direction of rotation.
a) Discharge valve closed or
blocked.
b) Non-return valve blocked.
c) Air in pump.
Remedy
Have the cable and motor checked
and repaired by a qualified electri-
cian.
Install fuses of the correct type.
Clean the impeller.
Check the level switch.
Set the relay in accordance with
the specifications on the name-
plate.
Measure the voltage between mo-
tor phases. Tolerance: ±10%.
Clean the impeller.
Clean the impeller.
Check the direction of rotation and
possibly interchange two phases,
see section 6.1 Direction of rota-
tion.
Check discharge valve and possi-
bly open and/or clean.
Clean non-return valve.
Vent the pump.
Subject to alterations.
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