• Pressure switch (PSR11)
• Blow-off valve (Y1)
The contacts of pressure switch (PSR11) open and close at preset pressures. During loaded operation, the
contacts are closed: the motor is running.
When the working pressure reaches the upper limit, the contacts of the pressure switch open: the motor stops.
Blow-off valve (Y1) opens and the pressure in the air/oil separator is released. When the working pressure
decreases to the pre-set minimum pressure, the contacts of the pressure switch close and the motor restarts.
Blow-off valve Y1 closes and compressed air supply is resumed.
GX 7
Detail view of unloader assembly (UA)
The main components of the regulating system are:
• Pressure switch: contact opens and closes at preset pressure limits. See also section Protection of the
compressor.
• Unloader (UA), including inlet valve (IV) and unloading valve (UV).
• Loading solenoid valve (Y1).
As long as the working pressure is below the preset maximum, the solenoid valve is energised, allowing
control air to the unloader: the inlet valve opens completely and the unloading valve closes completely. The
compressor will run fully loaded (100% output).
When the working pressure reaches the maximum limit, the solenoid valve is de-energised, venting the control
air: the inlet valve closes completely and the unloading valve opens completely. The compressor will run
unloaded (0% output).
• If the compressor keeps running unloaded for an uninterrupted period of 240 seconds, it will be stopped.
• If the pressure reaches the minimum pressure level before the 240 seconds are reached, the compressor
will automatically start running loaded again.
The compressor will automatically restart when the net pressure drops to the minimum limit.
Instruction book
18 2920 7105 31
To Next Page
Loading...
Need help?
General
