Faults, Causes And Remedies - Wilo Jet WJ Serie Instrucciones De Instalación Y Servicio

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8 Faults, Causes and Remedies

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