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16
10. 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.
WARNING
Moving parts
Death or serious personal injury
•
Tighten the coupling screws to the
correct torque.
•
Install the coupling guards securely to
the pump with the screws intended for
this purpose.
CAUTION
Corrosive liquids
Death or serious personal injury
•
Wear personal protective equipment.
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.
Motor does not run
when started.
a) Power supply failure.
Connect the power supply.
b) Fuses are blown.
Replace fuses.
c)
Motor-protective circuit breaker has
tripped.
Reactivate the motor-protective
circuit breaker.
d) Thermal protection has tripped.
Reactivate the thermal protection.
e) Main contacts in motor-protective
circuit breaker are not making contact
or the coil is faulty.
Replace contacts or magnetic coil.
f)
Control circuit is defective.
Repair the control circuit.
g) Motor is defective.
Replace the motor.
2.
Motor-protective
circuit breaker trips
immediately when
power supply is
switched on.
a) One fuse blown/automatic circuit
breaker has tripped.
Replace fuse/cut in the circuit
breaker.
b) Contacts in motor-protective circuit
breaker are faulty.
Replace motor-protective circuit
breaker contacts.
c)
Cable connection is loose or faulty.
Fasten or replace the cable
connection.
d) Motor winding is defective.
Replace the motor.
e) Pump mechanically blocked.
Remove the mechanical blocking of
the pump.
f)
Motor-protective circuit breaker
overload setting is too low.
Set the motor-protective circuit
breaker correctly.
3.
Motor-protective-
circuit breaker trips
occasionally.
a) Motor-protective circuit breaker
overload setting is too low.
Set the motor-protective circuit
breaker correctly.
b) Low voltage at peak times.
Reestablish constant power supply.
4.
Motor-protective-
circuit breaker has
not tripped but the
pump does not run.
a) Check 1 a), b), d), e) and f).
