Adjustment Mdr3 Pressure Switch - Atlas Copco LF 2 Instruction Book

Instruction book
Example:

Stopping pressure: 7 bar(e)

Starting pressure: adjustable between 3 and 5.7 bar(e)
6.5

Adjustment MDR3 pressure switch

Views of air pressure switch MDR3 with ON/OFF switch
This pressure switch has a cover with rotary knob (4) for manual On/Off (Auto/Off).
Reference
1
2
3
4
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
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.
2920 7090 00
Description
Dial, overload relay
Adjusting screw, stopping pressure
Adjusting screw, pressure difference
On/off switch (Auto/Off)
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.
of the
55