Fault Finding Chart; Disposal - Grundfos AP80 Vortex Montage- Und Betriebsanleitung

8. Fault finding chart

Make sure that the electricity supply has 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.
5. Pump cycling between start
and stop.

9. Disposal

Disposal of this product or parts of it must be carried out accord-
ing 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 hazardous materials from it to your nearest
GRUNDFOS company or service workshop.
8
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.
a) Level switch out of adjustment or defective.
Remedy
Have the cable and motor checked and repaired
by a qualified electrician.
Install fuses of the correct type.
Clean the impeller.
Check the level switch.
Set the relay in accordance with the specifica-
tions on the pump nameplate.
Measure the voltage between two motor
phases.
Tolerance: ±10% (±5% for explosion-proof
pumps).
Clean the impeller.
Clean the impeller.
Check the direction of rotation and possibly in-
terchange two phases. See section 6.1 Check-
ing of direction of rotation.
Check the discharge valve and open and/or
clean.
Clean the non-return valve.
Vent the pump.
Check the level switch.
Subject to alterations.