Homa CTP 70 Originalbetriebsanleitung Seite 45

Oil Condition
The condition of the axial face seals can be checked by
visually inspecting the oil. Place the pump horizontally so
that the oil chamber check screw located on the side of
the motor housing is facing up (for larger pumps; one of
the two oil chamber control screws) Remove the screw
and withdraw a small quantity of oil. If the oil is milky or
cloudy, this indicates a defective shaft seal. In this case,
have the condition of the shaft seals checked by a HOMA
specialist workshop or the factory Customer Service de-
partment. Oil type: biodegradable HOMA-ATOX. Used oil
must be disposed of in accordance with the valid environ-
mental regulations.
Functional test of safety and monitoring systems.
Monitoring devices, for example, are temperature sensors
in the motor, sealing chamber control, motor protection
relays, monitoring relays, etc. Motor protection relays and
monitoring relays can generally be triggered manually for
testing purposes. To check the sealing chamber control or
the temperature sensor, the machine must be cooled to
ambient temperature and the monitoring device's power
cable in the switch cabinet must be disconnected. The
monitoring device is then checked using an ohmmeter.
The following values should be measured:
Bi-metal sensor: Value is equal to „0" - throughput
Thermistor: A thermistor has a cooling resistance be-
tween 20 and 100 Ω. For 3 sensors in a series, this would
equal a value of 60 - 300Ω.
PT100 sensor: PT100 sensors have a value of 100 Ω at
0°C. This value increases by 0.385 Ω per 1°C between
0°C and 100°C. An ambient temperature of 20°C there-
fore has a value of 107.7 Ω.
Sealing chamber control: The value must increase „in-
finitely". Water may be present in the oil for lower values.
Please refer to the instructions in the optionally available
evaluation relay.
Please contact the manufacturer in the event of larger
deviations!
The procedure for checking the safety and monitoring
equipment for the auxiliary hoisting gear can be found in
the respective operating manual..
General overhaul
During an overhaul, in addition to normal maintenance
work, the motor bearings, shaft seals, O-rings and the
power supply lines are also checked and replaced if nec-
essary. This work may only be performed by the manufac-
turer or an authorised/certified service workshop.
Changing operating fluid
The drained operating fluid must be checked for con-
tamination and water additions. If the operating fluid is
seriously contaminated and more than 1/3 of the fluid is
water, the fluid exchange must be repeated again after
4 weeks. If water is still present in the operating fluid, a
seal may be defective. Please consult your manufacturer.
When using sealing chamber or leakage monitoring, in the
event of a defective seal, the display will light up again
within the next 4 weeks after the exchange.
Generally, the following applies when changing op-
erating fluid: Turn off machine, allow it to cool, dis-
connect from the power supply (to be carried out by
a specialist!), clean and place on a solid surface in a
vertical position. Warm or hot operating fluid may be
under pressure. The emergent operating fluid may
cause burns. Therefore, allow the machine to cool to
ambient temperature first! Secure against tipping over
and/or sliding!
6.4. Seal chamber
Since there is a large number of variants and versions of
these pumps, the exact location of the locking screws var-
ies depending on the pump part used.
• Carefully and slowly unscrew the sealing chamber's
filler screw.
Attention: The operating fluid may be under pressure!
• Unscrew drain screw. Drain the operating fluid and
collect in a suitable container. Clean the drain screw,
equip with a new seal ring and tighten again. To drain
fully, the machine must be tipped slightly to the side.
Ensure that the machine cannot tip over and/or slide
away!
• Place machine horizontally and fill with operating
fluid. Observe the prescribed operating fluid and fill
quantities.
• Clean the filler screw, equip with a new seal ring and
tighten again.
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