Fault Finding The Product - Grundfos CRK Guía De Instalación Y Funcionamiento

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.
Fault
1. Motor does not run
when started.
2. Motor-protective
circuit breaker trips
immediately when
power supply is
switched on.
3. Motor-protective-
circuit breaker trips
occasionally.
4. Motor-protective-
circuit breaker has
not tripped but the
pump does not run.
16
Cause
a) Power supply failure.
b) Fuses are blown.
c) Motor-protective circuit breaker has
tripped.
d) Thermal protection has tripped.
e) Main contacts in motor-protective
circuit breaker are not making contact
or the coil is faulty.
f) Control circuit is defective.
g) Motor is defective.
a) One fuse blown/automatic circuit
breaker has tripped.
b) Contacts in motor-protective circuit
breaker are faulty.
c) Cable connection is loose or faulty.
d) Motor winding is defective.
e) Pump mechanically blocked.
f) Motor-protective circuit breaker
overload setting is too low.
a) Motor-protective circuit breaker
overload setting is too low.
b) Low voltage at peak times.
a) Check 1 a), b), d), e) and f).
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.
Remedy
Connect the power supply.
Replace fuses.
Reactivate the motor-protective
circuit breaker.
Reactivate the thermal protection.
Replace contacts or magnetic coil.
Repair the control circuit.
Replace the motor.
Replace fuse/cut in the circuit
breaker.
Replace motor-protective circuit
breaker contacts.
Fasten or replace the cable
connection.
Replace the motor.
Remove the mechanical blocking of
the pump.
Set the motor-protective circuit
breaker correctly.
Set the motor-protective circuit
breaker correctly.
Reestablish constant power supply.