Fault Finding The Product - Grundfos SPK Series Installation And Operating Instructions Manual

8. 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 starter
overload trips out
immediately when
supply is switched
on.
3. Motor starter
overload trips out
occasionally.
4. Motor starter has
not tripped but the
pump does not
run.
5. Pump runs but
gives no liquid or
pump capacity is
not constant.
Cause
a) Supply failure.
b) Fuses are blown.
c) Motor starter overload has tripped.
d) Main contacts in motor starter are not
making contact or the coil is faulty.
e) Control circuit is defective.
f) Motor is defective.
a) One fuse/automatic circuit breaker is
blown.
b) Contacts in motor starter overload are
faulty.
c) Cable connection is loose or faulty.
d) Motor winding is defective.
e) Pump mechanically blocked.
f) Overload setting is too low.
a) Overload setting is too low.
b) Low voltage at peak times.
a) Check 1 a), b), d) and e).
a) Pump strainer partly blocked by
impurities.
b) Liquid level in tank too low.
c) Pump rotates in the wrong direction.
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 protection.
Replace contacts or magnetic coil.
Repair the control circuit.
Replace the motor.
Cut in the fuse.
Replace motor starter contacts.
Fasten or replace the cable
connection.
Replace the motor.
Remove the mechanical blocking of
the pump.
Set the motor starter correctly.
Set the motor starter correctly.
Check the power supply.
Clean the strainer.
Increase the liquid level.
Change the direction of rotation of the
motor.
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