Disturbance / cause / trouble shooting
45
Disturbance
Cause
Trouble shooting
Pump vibrates or
makes a noise.
Anti-friction bear-
ing defective.
Exchange anti-
friction bearing.
Anti-friction bear-
ing not lubricated
properly.
Clean anti-friction
bearing and re-
lubricate.
Pump installed
under tension.
Connecting pipes
must be laid in
an unstressed
manner.
Cavitation
Check supply
for obstructions.
Check the duty
point and adjust if
necessary.
Pump runs but
immediately
switches off.
The motor circuit
breaker has been
triggered. Insuf-
ficient cooling of
the motor.
Provide adequate
motor cooling.
The motor circuit
breaker has been
triggered. Incor-
rect direction of
rotation of the
pump.
Check the direc-
tion of rotation.
Power input too
high.
Check the free
movement of the
pump.
Density of the
pumped medium
is too high.
Dilute the
pumped medium
or alter the proc-
ess.
Pump doesn't
operate in the
specified operat-
ing range.
Check the operat-
ing conditions.
An obstructed
pump has trig-
gered the motor
protection relay.
Check the free
movement of the
pump.
Pump switches
too often.
Observe operat-
ing mode.
Motor connected
incorrectly.
Connect motor to
correct operating
voltage.
Disturbance
Cause
Trouble shooting
Bearing becomes
hot
Bearing running
without lubrica-
tion:
lack of grease.
Top up grease,
replace bearing if
necessary.
Too much grease
in the bearing.
Remove surplus
grease until the
balls are just cov-
ered by grease.
Pump installed
under tension.
Connecting pipes
must be laid in
an unstressed
manner.
Anti-friction bear-
ing defective.
Exchange anti-
friction bearing.
Electric motor is
overly warm.
Incorrect direction
of rotation of the
pump.
Check the direc-
tion of rotation
and exchange
two phases to the
motor if neces-
sary.
Pump doesn't
operate in the
specified operat-
ing range.
Check the operat-
ing conditions.
Density of the
pumped medium
is too high.
Dilute the
pumped medium
or alter the proc-
ess.
Supply pipe and/
or impeller ob-
structed.
Clean the supply.
Remove any
sediment depos-
its from the pump/
pipeline.
Motor not power-
ful enough.
Replace motor
with a more pow-
erful model.
Motor connected
incorrectly.
Connect motor to
applicable operat-
ing voltage.
Coolant tempera-
ture > 40 °C.
Check ventilation
paths.
Pump switches
too often.
Observe operat-
ing mode.
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