English (GB)
31
9. Fault finding the product
Before attempting to diagnose any fault, read and observe the
safety instructions in section
Fault
Cause
Remedy
1. The pump does
not start or it
stops without
visible cause.
a) No power supply.
Re-establish the power supply,
start the pump manually and check
contactor operation.
b) Moisture in the stator housing or
in the terminal box. The moisture
switch interrupts the supply
voltage.
Contact an authorised service
workshop.
c) The water-in-oil sensor is not
covered by oil. The sensor
interrupts the supply voltage.
Contact an authorised service
workshop.
2. The pump does
not start or it
stops. The
control panel of
the controller
indicates that
the motor-
protective
circuit breaker
or protection
equipment has
tripped out.
a) Missing phase.
Re-establish all phases.
b) The pump is momentarily
overloaded.
Let the pump cool down for
approx. 10 minutes and try to start
again. In case the pump starts
now, the first stop was caused by a
tripping thermal switch.
If the fault occurs again, find the
cause of the overload.
Check the control panel fuses and
switch them on in case they have
tripped. Wait for approx. 10
minutes until the pump has cooled
down, and try to start the pump
again. In case the pump does not
start, the overload relay has
tripped and the pump needs
service. Contact an authorised
service workshop.
c) The impeller is clogged by
impurities.
Clean the impeller as required.
d) The motor-protective circuit
breaker is not set correctly.
Set the motor-protective circuit
breaker as required in relation to
the rated current.
e) The thermal switches have
tripped out. Insufficient motor
cooling.
Re-establish motor cooling.
f)
The moisture switch in the motor
has tripped out.
Contact an authorised service
workshop.
g) A motor cable is defective.
Contact an authorised service
workshop.
h) Fluctuating voltage.
Re-establish correct voltage
supply. Permissible deviation is -
10 %/+ 10 %.
