Operating and Maintenance Manual 09/2019 – part I
Screw compressors
24
- Connect the compressor to the compressed air system with a flexible conduit.
- A compressed air receiver tank is necessary for proper compressor operation.
- When the compressed air receiver tank is located outside the compressor room, install the
pressure gauge, connected to the tank or pressure conduit supplying the tank, in a visible
location.
- Do not operate the compressor above the maximum operating pressure that is given on
the identification plate. It is not recommended to operate the compressor at the delivery
pressure below 0.5 MPa. Please contact our technicians when it is necessary to set that
overpressure.
- Check if all doors/covers are closed.
- Open the valve that shuts off the compressor from compressed air system.
- Check the “EMERGENCY STOP” button position.
- Switch on the compressor power supply.
When the compressor and compressed air system condition is checked, you can proceed
with starting the compressor.
To start the compressor, press the "START" button on the control panel. The compressor
motor starts working and depending on the overpressure in the compressed air system, the
machine switches to the loaded operation mode or, if the overpressure in the compressed
air system is higher than the minimum start pressure, it switches to the stand-by mode and
starts again after its drop.
Incorrect rotation direction of the screw block rotors for more than 5 seconds
will damage the screw compressor.
6.2. Restart (after longer downtime)
Follow the procedure described below to start the compressor which has been out of use
or stored for over 3 months:
- Check if there is no water in the oil tank. If necessary, remove water from the tank.
- Turn the compressor shaft several times by hand in the rotating direction.
- Lubricate the rotors in the screw block. To do this, remove the air filter and its housing
from the suction regulator or disconnect the hose supplying air from the filter to the
suction regulator. Pour oil into the suction regulator. The necessary oil volume depends
on the compressor power. In the case of power up above 30 kW, pour 0.5 l of oil.
- After pouring the oil, wait one minute and check its level once again.
- Turn the compressor shaft several times by hand in the rotating direction.
- Check the oil level in the tank.
- Check the tension of the V-belts or the condition of the flexible coupling.
- Check that all doors / covers are closed.
- Open the valve shutting offthe compressor from the compressed air network.
- Turn on the machine power.
- Check the position of the "EMERGENCY STOP" button.
After checking of the compressor and compressed air system condition, you can start the
compressor.
Press the "START" button on the control panel. The compressor motor starts running and,
depending on the overpressure in the compressed air system, the machines witches to
loadmodeor, if the overpressure in the network is higher than the minimum switch-on
pressure, it switches to standby mode and starts again when the pressure drops.
Perform the trial run of the compressor screw block lasting for at least a few minutes.
During the trial run, check the machine for correct operation, noise, vibration, oil leaks and
tightness of connections in the compressed air system.
- Do not operate the compressor above the maximum pressure stated on the compressor
identification plate. Compressor operation at a discharge pressure below 0.5 MPa is not
recommended. If you need to set this overpressure, please contact our specialists.
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