Fault Finding Chart - Biral HP 3 Notice De Montage Et D'utilisation

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14. Fault finding chart

Before removing the terminal box cover
and before any removal/dismantling of
the pump, make sure that the electricity
supply has been switched off.
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 out but
the pump does not
run
5. Pump capacity
not constant
6. Pump runs but gives
no water
7. Pump runs backwards
when switched off
8. Leakage is shaft seal
9. Noise
Cause
a) Supply failure
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
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 1a), b), d) and e)
a) Pump inlet pressure is too low
(cavitation)
b) Suction pipe/pump partly blocked
by impurities
c) Pump draws in air
a) Suction pipe/pump blocked
by impurities
b) Foot or non-return valve blocked
in closed position
c) Leakage in suction pipe
d) Air in suction pipe or pump
e) Motor rotates in the wrong direction
a) Leakage in suction pipe
b) Foot or non-return valve is defective
a) Shaft seal is defective
a) Cavitation occurs in the pump
b) Pump does not rotate freely (frictional
resistance) because of incorrect pump
shaft position.
c) Frequency converter operation
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 connection
Replace the motor
Remove the mechanical blocking
of the pump
Set the motor starter correctly
Set the motor starter correctly
Check the electricity supply
Check the suction conditions
Clean the pump or suction pipe
Check the suction conditions
Clean the pump or suction pipe
Repair the foot or non-return valve
Repair the suction pipe
Check the suction conditions
Change the direction of rotation of the motor
Repair the suction pipe
Repair the foot or non-return valve
Replace the shaft seal
Check the suction conditions
Adjust the pump shaft
See section 7.1
Frequency converter operation
35