11
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.
Visual control at pump types with oil chamber (mod-
els without cooling jacket or model „U“ with cooling
jacket and open cooling circuit):
Oil level and oil condition:
The condition of the mechanical seals can be visually con-
trolled as follows:
Put the pump in horizontal position, so that the screw of
the oil chamber is on top (for larger pumps: one of both oil
chamber screws).
Remove the screw and take out a small quantity of oil.
The oil becomes greyish white like milk if it contains water.
This may be the result of defective shaft seals.
In this case the condition of the shaft seals should be
checked by a HOMA Service shop.
The oil should be replaced after 3000 operating hours.
Oil type: degradable HOMA-ATOX. Used oil has to be
disposed according to the existing environmental rules
and regulations
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 Cause Remedy
Motor does not start.
Fuses blow or motor
starter trips out imme-
diately.
Caution:
Do
not start again!
•
Supply failure; short-
circuit; earth-leakage;
fault in cable or motor
winding
•
Have the cable and
motor motor
checked and re-
paired by a qualified
electrician
•
Fuses blow due to use
of wrong type of fuse
•
Install fuses of the
correct type
•
Impeller blocked by
impurities
•
Clean the impeller
•
Level switch is defect
•
Check the float
switch and replace
the float switch if
necessary
Pump operates, but
motor starter trips out
after a short while
•
Low setting of thermal
relay in motor starter
•
Set the relay in ac-
cordance with the
specifications on the
pump label
•
Increased current
consumption due to
large voltage drop
•
Measure the voltage
between two motor
phases. Tolerance:
± 10% (± 5% for ex-
plosion-proof
pumps)
•
Impeller blocked by
impurities. Increased
current consumption
in all three phases
•
Clean the impeller
Pump operates at be-
low-standard perform-
ance and power con-
sumption
•
Impeller blocked by
impurities
•
Clean the impeller
Pump operates, but
gives no liquid
•
Discharge valve
closed or blocked
•
Check the dis-
charge valve and
possibly open
and/or clean
•
Non-return valve
blocked
•
Clean non-return
valve
•
Air in pump
•
Vent the pump
Pump starts and stops
running in short periods
•
Float switch is defect
•
Check the float
switch and replace
the float switch if
necessary
WEEE Notice
The Directive on Waste Electrical and Electronic Equipment
(WEEE), which entered into force as European law on 13th Feb-
ruary 2003, resulted in a major change in the treatment of electri-
cal equipment at end-of-life.
The purpose of this Directive is, as a first priority, the prevention
of WEEE, and in addition, to promote the reuse, recycling and
other forms of recovery of such wastes so as to reduce disposal.
The WEEE logo on the product or on its box indicates that this
product must not be disposed of or dumped with your other
household waste. You are liable to dispose of all your electronic
or electrical waste equipment by relocating over to the specified
collection point for recycling of such hazardous waste. Isolated
collection and proper recovery of your electronic and electrical
waste equipment at the time of disposal will allow us to help con-
serving natural resources. Moreover, proper recycling of the elec-
tronic and electrical waste equipment will ensure safety of human
health and environment. For more information about electronic
and electrical waste equipment disposal, recovery, and collection
points, please contact your local city centre, household waste
disposal service, shop from where you purchased the equipment,
or manufacturer of the equipment.
