MEASURING SENSORS
The following temperature sensors and pressure transducer are installed in the compressor
installation:
(39) - air filter pollution sensor,
(33) - temperature sensor - realizes the measurement of the compressed air temperature after
the I stage (3),
(35) - temperature sensor - realizes the measurement of the compressed air temperature after
cooling in the radiator (6),
(34) - pressure transducer - performs measurement of air pressure after the radiator (6),
(38) - temperature sensor - realizes air temperature measurement after the II stage (8),
(37) - temperature sensor - realizes air temperature measurement after the radiator (10),
(36) - pressure transducer - performs the measurement of compressed air pressure after the
cooler, behind the check valve,
(31) - temperature sensor - performs measurement of oil temperature,
(32) - pressure transducer - performs oil pressure measurement.
These sensors and transducers work with the PLC.
WATER CONDENSATE DRAIN
Water in the compressor ai
r
system means a very high risk of failure, including the screw air end
failure. This is why the water condensate from the air is carefully drained in the compressor. The
condensate from the separator (7) after the intercooler (6) is drained out of the compressor by
float operated mechanical condensate drain (25).
VENTILATION OF THE SCREW AIR-END INSIDE
During operation of the compressor in the spaces in the interior of its bodies, bearing housings
and seals a small overpressure is produced. This is detrimental to the correctness of the
lubrication and sealing processes. Therefore, these spaces must be ventilated. This is
accomplished by means of a flexible hose and an air filter located at the tunnel of the fan; In the
figure it is marked with a symbol (40).
COMPRESSOR COOLING
The compressor is cooled in a forced manner by means of a fan with its own electric drive. The air
is sucked in through the inlets on the front and rear wall of the housing and pushed through a set
of radiators placed on top of the compressor and thrown outside the compressor.
OPERATION OF THE OIL FREE COMPRESSOR
The compressor is started by pressing the START button on the control panel. After the button is
pressed, the compressor drive is activated. The compressor is designed for intermittent run. The
intermittent operation involves air pressurisation until the maximum overpressure set on the
pressure switch is reached.
When this pressure is reached, the compressor switches to idle running (the hydraulic actuator
closes the air supply on the compressor suction side) and then there is a countdown of the time to
stop. If during this time the air pressure decreases, the compressor will start again, and if not, it
will shut down after the countdown. The compressor is restarted when the overpressure in the
piping drops to the minimum value set in the controller.
The compressor can be stopped at any time by pressing the STOP button on the controller panel.
The operation is resumed by pressing the START button.
When the overpressure in the piping on the compressor start exceeds the value set in
the pressure switch, the compressor will start only after the overpressure drops to the minimum
value.
