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6. Fault finding
6.1 Fault finding chart
Fault
1. Mixer does not start.
2. Mixer starts but stops
immediately.
3. No or inadequate
circulation produced even
if the motor is running.
4. Mixer runs unevenly and
is noisy.
5. High current and power
consumption.
GB
26.11.2003
Cause
a) No electricity supply or supply failure.
b) Supply cable is faulty.
c) Control system is faulty.
d) Propeller not free to rotate.
e) Stator windings are faulty.
f) Motor cut out because of overheating.
g) Different phase voltages.
h) Overload relay is set too low or is faulty.
i) Humidity in motor.
a) Stator windings are faulty.
b) Different phase voltages.
c) Overload relay is set too low or is faulty.
d) Humidity in motor.
a) Propeller rotates in the wrong direction.
b) Mixer runs on two phases.
c) Internal parts are worn.
d) Propeller blades are dirty or damaged.
a) Internal parts are worn.
b) Propeller blades are dirty or damaged.
c) Oscillations caused by the installation (resonance). Check installation design.
a) Wrong voltage supply or supply failure.
b) Supply cable is faulty.
c) Control system is faulty.
d) Propeller not free to rotate.
e) Stator windings are faulty.
f) Mixer runs on two phases.
g) Internal parts are worn.
8 / 9
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 starter.
Set the starter to the rated
current.
Contact GRUNDFOS.
Contact GRUNDFOS.
Call in an electrician.
Check the motor starter.
Set the starter to the rated
current.
Contact GRUNDFOS.
Interchange two phases of the
mains supply.
Replace 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.
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.
Replace faulty fuses.
Call in an electrician.
Check the electrical connections.
Contact GRUNDFOS.
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