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Return of pumps
If a pump has been used for a liquid which is injurious
to health or toxic, the pump will be classified as contami-
nated.
If HOMA is requested to service the pump, HOMA must
be contacted with details about the pumped liquid, etc.
before the pump is returned for service. Otherwise HOMA
can refuse to accept the pump for service (see attach-
ment).
Possible costs of returning the pump are paid by the cus-
tomer. However, any application for service (no matter to
whom it may be made) must include details about the
pumped liquid if the pump has been used for liquids which
are injurious to health or toxic.
10. Fault Finding Chart
Before maintenance or repair disconnect the pump
from the power supply to avoid accidental starting of the
pump!
Fault
Motor does not start.
Fuses blow or motor
starter trips out im-
mediately. Caution:
Do not start again!
Pump operates, but
motor starter trips
out after a short
while
Pump operates at
below-standard
performance and
power consumption
Oil in the medium
Pump operates, but
gives no liquid
13
Cause
Remedy
• Supply failure;
• Have the cable
short-circuit; earth-
and motor
leakage; fault in
checked and re-
cable or motor
paired by a quali-
winding
fied electrician
• Fuses blow due to
• Install fuses of
use of wrong type
the correct type
of fuse
• Impeller blocked by
• Clean the
impurities
impeller
• Level switch out of
• Check the level
adjustment or de-
switch
fective
• Low setting of
• Set the relay in
thermal relay in mo-
accordance with
tor starter
the specifications
on the pump label
• Increased current
• Measure the volt-
consumption due to
age between two
large voltage drop
motor phases.
Tolerance: ± 10%
• Impeller blocked by
• Clean the
impurities. In-
impeller
creased current
consumption in all
three phases
• Impeller blocked by
• Clean the
impurities
impeller
• Wrong direction of
• Check the direc-
rotation (only 3 Ph-
tion of rotation
pumps)
and possibly in-
terchange two
phases (see sec-
tion 6.4)
• Wear-out of the
• Replace the ra-
radial shaft ring
dial shaft ring,
change the oil
• Discharge valve
• Check the dis-
closed or blocked
charge valve and
possibly open
and/or clean
• Non-return valve
• Clean non-return
blocked
valve
• Air in pump
• Vent the pump
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