Operating and Maintenance Manual 09/2019 – part I
Screw compressors
36
8.3.10 Oil temperature gauge(where applicable)
The oil temperature gauge is installed on the control panel. It monitors the permissible
compressor oil operating temperature that is factory set to 110°C (red mark).
When that temperature is reached, the compressor power supply circuit is interrupted. The
system switches off automatically. The compressor can be restarted when the cause of
excessive temperature increase is removed and oil temperature is reduced.
8.3.11 Oil cooler / air cooler
The air/oil cooler must be regularly cleaned to ensure safe operation of the screw
compressor. The cooling ribs of the cooler must be kept clean. This is the only way to
ensure full cooling capacity. Sufficient cooling ensures lower oil temperature and thus
longer life. It is therefore recommended to clean the cooler ribs with compressed air, jet of
steam or detergent solution. If the aforementioned cleaning methods prove ineffective in
reducing the operating temperature, the cooler components which the oil flows through
must be cleaned internally to remove deposit using special deposit removal agents. To do
this, remove the cooler.
In case of heavy contamination of the air being sucked (cooling air), it is necessary to clean
the cooler more often, especially when the temperature of the compressed air at the
compressor outlet is more than 15°C higher than the ambient temperature.
The cleaning frequency depends on the conditions existing in the room, where the
compressor is located.
Maintenance procedure:
- Stop the compressor and close the pressure conduit valve.
- Switch off the power supply and take measures to prevent it from being unintentionally
switched on again by unauthorised persons.
- Verify that the machine has been de-energised (0 V).
- Wait minimum 5 minutes and then open the compressor guard.
- Check that the system has been emptied by slowly unscrewing the oil filler cap (use
protective clothing) (Fig.10). The compressed air can be hot.
- Remove the components that may hinder access to the cooler. If necessary, remove the
cooler.
- Remove any dirt.
- Install all the removed components.
- Fill (replenish) the oil in the compressor(if necessary).
- Perform a trial run for about 3 to 5 minutes.
- Stop the compressor, check the oil level and top it up if necessary.
Do not use any sharp objects for cleaning, because they may damage
the cooler.
8.3.12. Electric motor
When the compressor is running, check the motor operation by paying attention to the
following:
- Operating noise,
- Excessive vibration,
- Excessive current consumption –protection activation in the electrical cabinet,
- The condition of the fixing screws,
- A degree of fouling.
The motor (compressor) should be stopped immediately in case of:
- Overheating,
- Smoke or burning smell,
- Excessive vibration,
- Bearing noise.
The machine can be restarted after removing the cause of any
failures
.
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