English (GB)
30
9. Fault finding the product
For pumps with sensor, start fault finding by checking
the status on the IO 113 front cover. See installation
and operating instructions for IO 113.
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the fuses have been
removed or the main switch has been
switched off and locked in position 0.
Make sure that the power supply cannot
be accidentally switched on.
Fault Cause Remedy
1. The motor does not
start. The fuses blow
or the motor-
protective circuit
breaker trips
immediately.
Caution: Do not start
again!
a) Power supply failure, short circuit
or earth leakage in the power
cable or the motor windings.
Have the cable and the motor checked
and repaired by a qualified electrician.
b) The fuses blow due to use of
wrong type of fuse.
Fit fuses of the correct type.
c) The impeller is blocked by
impurities.
Clean the impeller.
d) The air bells, float switches or
electrodes are out of adjustment or
defective.
Readjust or replace the air bells, float
switches or electrodes.
e) Moisture in the stator housing
(alarm). IO 113 interrupts the
supply voltage.*
Replace the O-rings, the shaft seal and
the moisture switch.
f) The WIO sensor is not covered by
oil (alarm). IO 113 interrupts the
supply voltage.*
Check, and possibly replace, the shaft
seal, fill up with oil and reset IO 113.
g) The stator insulation resistance is
too low.*
Reset the alarm on IO 113, see the
installation and operating instructions
for IO 113.
2. The pump operates,
but the motor-
protective circuit
breaker trips after a
short while.
a) Low setting of the thermal relay in
the motor-protective circuit
breaker.
Set the relay in accordance with the
specifications on the nameplate.
b) Increased current consumption
due to a large voltage drop.
Measure the voltage between two
motor phases. Tolerance: - 10 %/+ 6
%. Reestablish correct voltage supply.
c) The impeller is blocked by
impurities. Increased current
consumption in all three phases.
Clean the impeller.
d) The direction of rotation is wrong. Check the direction of rotation and
possibly interchange any two of the
phases in the incoming power cable.
See section 4.1 Checking the direction
of rotation.
3. The thermal switch of
the pump trips after a
short while.
a) The liquid temperature is too high. Reduce the liquid temperature.
b) The viscosity of the pumped liquid
is too high.
Dilute the pumped liquid.
c) The electrical connection is wrong.
(If the pump is star-connected to a
delta connection, the result will be
very low undervoltage).
Check and correct the electrical
installation.
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