
B–70115EN/03
9. SETTING AND ADJUSTMENT
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This unit is precisely adjusted at the factory and should not require any
further adjustment. If the pressure controller is replaced or requires
re–adjustment, however, it should be set and adjusted as described below:
(1)Turn the CNC on. Never turn on the gas pressure control start signal
(RUN) at this stage.
(2)Set the secondary pressure of the regulator of the external laser gas
supply (gas cylinder, for example) to 0.1 MPa.
(3)The gas supply pressure sensor is indicated as PSW1 on the pressure
controller. This sensor can be adjusted by a trimmer. Turn the
adjustment trimmer with a cross–headed precision screwdriver until
the red LED next to the trimmer lights. Then, turn the trimmer through
a further 30 degrees.
(4)To check the setting, reduce the secondary pressure of the regulator on
the laser gas supply unit (gas cylinder, for example) to 0.05 MPa. The
red LED of the gas supply pressure sensor (PSW1) should go off.
(5)This completes the setting.
While setting the sensor, the pressure controller is open to the atmosphere.
To prevent dust from entering the controller, pay particular attention to the
immediate surroundings.
(1)Turn off the CNC. Then, turn off the power supply and open main
circuit breaker on the back panel of the laser oscillator.
(2)Remove the orange gas tube by loosening the hexagon cap nuts
securing the tube. This causes the atmospheric pressure sensor to
detect the atmospheric pressure.
(3)Close the main circuit breaker and turn on the power supply, then turn
on the CNC. A voltage of 24 V is supplied to the sensor. Never turn
on the gas pressure control start signal (RUN).
(4)The atmospheric pressure sensor is indicated as PSW2 on the front of
the pressure controller. Turn the adjustment trimmer with a
cross–headed precision screwdriver until the red LED next to the
trimmer just lights.
(5)Replace the gas tube and secure the nuts.
(6)Turn on the gas pressure control start signal (RUN). Check that the
red LED next to the sensor goes off after the exhaust pump starts.
(7)This completes the setting.
9.4
PRESSURE
CONTROL UNIT
9.4.1
Setting the Gas Supply
Pressure Sensor
9.4.2
Setting the
Atmospheric Pressure
Sensor