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10
6. Fault finding the product
WARNING
Electric shock
Death or serious personal injury
- Before starting any work on the product,
make sure that the power supply has
been switched off and that it cannot be
accidentally switched on.
- Connect the pump to an external main
switch close to the pump and to a
motor-protective circuit breaker or a
CUE frequency converter.
- Make sure you can lock the main switch
in OFF position (isolated). Type and
requirements as specified in EN 60204-
1, 5.3.2.
CAUTION
Toxic liquids
Death or serious personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold liquid
Minor or moderate personal injury
- Wear personal protective equipment.
CAUTION
Hot or cold surface
Minor or moderate personal injury
- Make sure that no one can accidentally
come into contact with hot or cold
surfaces.
Fault
Cause
Remedy
1.
The motor does
not run when
started.
a)
Supply failure.
Connect the electricity supply.
b)
The fuses are blown.
Replace fuses.
c)
The motor-protective circuit breaker
overload has tripped.
Reactivate the motor-protective circuit
breaker.
d)
The main contacts in the motor-
protective circuit breaker are not
making contact or the coil is faulty.
Replace contacts or magnetic coil.
e)
The control circuit is defective.
Repair the control circuit.
f)
The motor is defective.
Replace the pump.
2.
The motor-
protective circuit
breaker overload
trips immediately
when the supply
is switched on.
a)
One fuse is blown or the motor-
protective circuit breaker has tripped.
Replace the fuse or reactivate the
motor-protective circuit breaker.
b)
The contacts in the motor-protective
circuit breaker overload are faulty.
Replace the motor-protective circuit
breaker contacts.
c)
The cable connection is loose or
faulty.
Fasten or replace the cable
connection.
d)
The motor winding is defective.
Replace the pump.
e)
The pump is mechanically blocked.
Remove the mechanical blocking of
the pump.
f)
The overload setting of the motor-
protective circuit breaker is too low.
Set the motor-protective circuit breaker
correctly.
3.
The motor-
protective circuit
breaker overload
trips occasionally.
a)
The overload setting of the motor-
protective circuit breaker is too low.
Set the motor-protective circuit breaker
correctly.
b)
The voltage is low at peak times.
Check the electricity supply.
4.
The motor-
protective circuit
breaker has not
tripped but the
pump does not
run.
a)
Check 1 a), b), d) and e).
