Atlas Copco LT 2 Instruction Book page 63

Instruction book
Function
The switch allows the operator to select the stopping pressure and the pressure difference between stopping
and starting pressures. The stopping and starting pressures are the opening and closing pressures of the switch.
Adjustment
The stopping pressure is controlled by adjusting screw (2). Turn the screw clockwise to raise the stopping
pressure, counter-clockwise to lower it.
The pressure difference between starting and stopping is adjusted by means of adjusting screw (3). The
adjustment range is shown in the graph below. Turn the screw counter-clockwise to reduce the pressure
difference, clockwise to increase it.
Pressure difference diagram, MDR3/16 (15 bar units)
Pressure difference diagram, MDR3/25 (20 bar units)
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• Adjust the air pressure switch while it is pressurized.
• Switch off the voltage before removing the cover of the switch; reinstall it after an
adjustment has been made and before the voltage is switched on again.
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