Fault Finding; Fault Finding Chart - Grundfos AMD Serie Montage- Und Betriebsanleitung

10. Fault finding

Warning
Before starting any work on the mixer,
make sure that the fuses have been
removed or the mains switch has been
switched off. Make sure that the power
supply cannot be accidentally switched on.
All rotating parts must have stopped
moving.

10.1 Fault finding chart

Fault Cause
1. The mixer does a)
not start.
b)
c)
d)
e)
f)
g)
h)
i)
2. The mixer a)
starts but stops
b)
immediately.
c)
d)
3. No or a)
inadequate
circulation
b)
produced even
if the motor is
running.
c)
d)
4. The mixer runs a)
unevenly and is
b)
noisy.
c)
10
No power supply or supply failure.
The power supply cable is faulty.
The control system is faulty.
The propeller is not free to rotate.
The stator windings are faulty.
The motor has cut out because of
overheating.
Different phase voltages.
The motor-protective circuit breaker is
set too low or is faulty.
There is humidity in the motor.
The stator windings are faulty.
Different phase voltages.
The motor-protective circuit breaker is
set too low or is faulty.
There is humidity in the motor.
The propeller rotates in the wrong
direction.
The mixer runs on two phases.
The internal parts are worn.
The propeller blades are dirty or
damaged.
The internal parts are worn.
The propeller blades are dirty or
damaged.
Oscillations caused by the installation. Check the installation design.
Remedy
Check the electrical installation.
Call in an electrician.
Call in an electrician.
Call in an electrician.
Clean the propeller blades and check
manually that the propeller can rotate
freely.
Contact Grundfos.
Wait until the motor has cooled and
attempt to restart the mixer.
Call in an electrician.
Check the motor-protective circuit
breaker.
Set the circuit breaker to the rated
current.
See section 7.1 Motor protection.
Contact Grundfos.
Contact Grundfos.
Call in an electrician.
Check the motor-protective circuit
breaker.
Set the circuit breaker to the rated
current.
See section 7.1 Motor protection.
Contact Grundfos.
Interchange two phases of the mains
supply.
Replace the faulty fuses.
Call in an electrician.
Check the electrical connections.
Contact Grundfos.
Clean the blades and inspect for any
wear.
Contact Grundfos.
Clean the blades and inspect for any
wear.