ENGLISH
8
8 Faults, Causes and Remedies
Faults
Causes
Remedies
Pump does not run
Interruption of the current, short circuit,
Check power supply, Call on expert to check cable
Insulation fault in the motor coil
and motor
Pump is blocked due to foreign matters 1)
– Switch off the pump voltage and secure against re-
operation.
– Close the shut-off fittings at the back and front of
the pump.
– Remove foreign bodies from the pump
Protective motor switch activated (1 ~ -Motor)
Let the pump/motor cooling
Motor overheats
Too low voltage
Check voltage on terminals of the motor.It should be
within ± 10 % (50 Hz), resp. ± 6 % (60 Hz) of the
rated voltage.
Pump is blocked due to foreign matters
see 1)
Ambient temperature above +40 °C
The motor is aimed at operating at a maximum
ambient temperature of +40 °C
Altitude > 1000 m
Motor is planned to operate at an altitude
≤
1000 m
Thermal relay
Value of the thermal relay (3 ~ -Motor) is too low
Check the current with an ammeter or put the value
switches off of the cuttent rating mentioned on the
motor data plate
Voltage is too low
Check the adequate cross-section of the electrical
cable conductors
A phase is cut
Check it and change the electrical cable if
necessary
Thermal relay of the curcuit-breaker is defective
Replace it
Motor is defective
Replace it
Pump runs, but no
Pump is blocked due to foreign matters
see 1)
delivery or it
Pump is empty
Fill the pump
tranports too little
Air in suction pipes
Check tightness of the whole pipe up to the pump
and make it tight
Suction pie obstructed
Clean all the pipes
Wrong rotating direction(3 ~ -Motor)
Cross two phase wires
Pump vibrates
Loose on ist foundation
Check and completely tighten the nuts of the stud
bolts
Pump is blocked due to foreign matters
see 1)
Bad electrical connection
Check the connections to the pump motor
A blockage of the pump can in most cases be remedied by removing the suction connection and scouring the pump backwards
under pressure.
Switch-on pump several times for 2 secs during scouring.
If the fault cannot be located or rectified, please contact your nearest WILO representative.
Technical modifications reserved.
