Faults, Causes And Remedies - Wilo Jet WJ Série Notice De Montage Et De Mise En Service

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8. Faults, Causes and Remedies

Faults
Pump does not run
Motor overheats
Thermal relay
Pump runs, but no delivery or it
tranports too little
Pump vibrates
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.
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Causes
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)
Too low voltage
Pump is blocked due to foreign matters
Ambient temperature above +40 °C
Altitude > 1000 m
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 is blocked due to foreign matters
Pump is empty
Air in suction pipes
Suction pie obstructed
Wrong rotating direction(3 ~ -Motor)
Loose on ist foundation
Pump is blocked due to foreign matters
Bad electrical connection
Remedies
Check power supply, Call on expert to
check cable and motor
– Switch off the pump voltage and
secure against reoperation.
– 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 ± 6 % (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 alti-
tude ≤ 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
WILO SE 08/2017