Fault Finding Chart - Homa CTP 50 Serie Original-Manuel D'instructions De Montage

For long and trouble-free operation of the pump, following
points should be checked regularly:
- Nominal current (A): Check with amp-meter.
- Pump parts and impeller: Check for possible wear.
Replace defective parts.
- Ball bearings: Check the shaft for noisy or heavy opera-
tion (turn the shaft by hand). Replace defective ball bear-
ings. A general overhaul of the pump is usally required in
case of defective ball bearings or poor motor function.
This work must be carried out by an authorized
service workshop.
- Cable entry: Make sure that the cable entry is watertight
and that the cables are not bent sharply and/or pinched.
Additionally at pump types with oil chamber:
- Oil level and oil condition in oil chamber:
Put the pump in horizontal position, so that the screw of
the oil chamber is above (at larger pumps: one of both
screws). Remove the screw and infer a small quantity of
oil. The oil becomes greyish white like milk if it contains
water. This may be the result of defective shaft seal.
In this case leave the condition of the shaft seals by a
HOMA Service to examine.
The oil should be replaced after 3000 operating hours.
Oil type: degradable HOMA-Atox. Used oil is to be dis-
posed accordingly.
Servicing Contract
For a regular expert execution of all necessary mainte-
nance and inspection we recommend the conclusion of a
servicing contract by our HOMA Service. Please contact
our HOMA customer service.
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 imme-
diately. Caution: Do
not start again!
Pump operates, but
motor starter trips out
after a short while
Pump operates at be-
low-standard
performance and power
consumption
Pump operates, but
gives no liquid
14
Cause Remedy
• Supply failure; short- • Have the cable and
circuit; earth-leakage; motor checked and
fault in cable or motor repaired by a quali-
winding fied electrician
• Fuses blow due to use • Install fuses of the
of wrong type of fuse correct type
• Impeller blocked by • Clean the impeller
impurities
• Level switch out of • Check the level
adjustment or defec- switch
tive
• Low setting of thermal • Set the relay in ac-
relay in motor starter cordance with the
specifications on the
pump label
• Increased current • Measure the voltage
consumption due to between two motor
large voltage drop phases. Tolerance:
± 10% (± 5% for ex-
plosion-proof
pumps)
• Impeller blocked by • Clean the impeller
impurities. Increased
current consumption
in all three phases
• Impeller blocked by • Clean the impeller
impurities
• Wrong direction of • Check the direction
rotation (only 3 Ph- of rotation and pos-
pumps) sibly interchange
two phases (see
section 6.5.)
• 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