Homa AMX 644-330 53 F Series, Инструкция по установке и эксплуатации

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9. Maintenance and Repair
Before maintenance or repair disconnect the pump
from the power supply to avoid accidental starting of the
pump!
Before carrying out maintenance and service, the pump
must be thoroughly flushed with clean water. Rinse the
pump parts in clean water after dismanteling.
In case of a defect of the pump, a repair shall be car-
ried out only by the manufacturer or through an authorized
workshop. Conversions or alternations of the machine/unit
are permittes only after arrangement with the manufacturer.
Only HOMA spare parts shall be used.
In accordance with the product liability law we point out
that we shall not be liable for damages caused by our pro-
duct due to unauthorized repair by persons other than the
manufacturer or an authorized workshop or due to the use
of spare parts other than original HOMA parts. The same
product liability limitations are valid for accessories.
When unscrewing the inspection screw of the oil cham-
ber, please note that pressure may have built up in the
chamber. Do not remove the screw until the pressure has
been fully relieved.
Before maintenance or repair make sure that all rota-
ting parts stand still!
Pumps running under normal operation conditions should
be inspected at least once a year. If the pumped liquid is
very muddy or sandy or if the pump is operating conti-
nuously, the pump should be inspected every 1.000 opera-
ting hours.
When the pump is new or after replacement of the shaft
seals, check the oil level after one week of operation.
For long and trouble-free operation of the pump, following
points should be checked regularly:
- Nominal current (A): Check with amp-meter.
- Pump parts: Check for possible wear. Replace defective
parts.
- Ball bearings: Check the shaft for noisy or heavy operation
(turn the shaft by hand). Replace defective ball bearings. 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.
- Oil level and oil condition in oil chamber: The oil becomes
greyish white like milk if it contains water. This may be the
result of defective shaft seal. The oil should be replaced
after 3000 operating hour. Oil type: Shell Tellus
C22, degradable HOMA-Atox available on request..
- Mechanical seals: Check the mechanical seals for wear-
out.
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 checked and
repaired by a quali-
fied 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 out of
adjustment or defecti-
ve
• Check the level
switch
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 con-
sumption 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 •
Impeller blocked by
impurities
•
Clean the impeller
performance and power
consumption •
Wrong direction of
rotation (only 3 Ph-
pumps)
•
Check the direction
of rotation and pos-
sibly interchange
two phases (see
section 6.4)
Pump operates, but
gives no liquid •
Discharge valve clo-
sed or blocked
•
Check the discharge
valve and possibly
open and/or clean
• Non-return valve blok-
ked
• Clean non-return
valve
• Air in pump • Vent the pump