Fault Finding Chart; Disposal - Grundfos CRK 2 Serie Instrucciones De Instalación Y Funcionamiento

9. Fault finding chart

Before starting work on the pump, make sure that the electricity supply has been switched off and
that it cannot be accidentally switched on.
Fault Cause
1. Motor does not run a) Supply failure.
when started.
b) Fuses are blown.
c) Motor starter overload has tripped out.
d) Main contacts in motor starter are not
making contact or the coil is faulty.
e) Control circuit is defective.
f) Motor is defective.
2. Motor starter over- a) One fuse/automatic circuit breaker is
load trips out imme- blown.
diately when supply
b) Contacts in motor starter overload are
is switched on.
faulty.
c) Cable connection is loose or faulty.
d) Motor winding is defective.
e) Pump mechanically blocked.
f) Overload setting is too low.
3. Motor starter over- a) Overload setting is too low.
load trips out occa-
b) Low voltage at peak times.
sionally.
4. Motor starter has a) Check 1 a), b), d) and e).
not tripped out but
the pump does not
run.
5. Pump runs but a) Pump strainer partly blocked by impuri-
gives no liquid or ties.
pump capacity is
b) Liquid level in tank too low.
not constant.
c) Pump rotates in the wrong direction.

10. Disposal

Disposal of this product must be carried out accord-
ing to the following guidelines:
1. Use the local public or private waste collection
service.
2. In case such waste collection service does not
exist or cannot handle the materials used in the
product, please deliver the product or any haz-
ardous materials from it to your nearest GRUND-
FOS company or service workshop.
8
Remedy
Connect the electricity 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 connec-
tion.
Replace the motor.
Remove the mechanical blocking of the
pump.
Set the motor starter correctly.
Set the motor starter correctly.
Check the electricity supply.
Clean the strainer.
Increase the liquid level.
Change the direction of rotation of the
motor.
Subject to alterations.