CompAir L11 Service Manual

4. Design and functioning
22
Automatic operation (open-close operation)
• When the pressure reaches the upper switching point
set on the network pressure sensor (-7 - Fig. 4),
solenoid valve (Y1 Fig. 4) is de-energised.
• The intake regulator (- 2 - Fig. 4) is vented and
closed.
• The pressure reservoir (- 5 - Fig. 4) is depressurised
via the intake filter.
• The compressor is now running in idle mode.
• If the mains pressure does not fall within 90 seconds
(adjustable) to the lower switching point, the system
shuts down.
• If the lower switching point is reached in less than
90 seconds, the solenoid valve (- Y1 - Fig. 4) is
energised again.
• The unit now changes over to on-load operation.
Stopping the system
• After pressing the OFF button


(Fig. 16) on the
operating panel, the solenoid valve (- Y1 - Fig. 4) is
de-energised.
• The intake regulator (- 2 - Fig. 4) closes and the
tank (- 5 - Fig. 4) is relieved.
• After 30 seconds, the drive motor (- 3 - Fig. 4) is
shut down.
4.5.2 System control L07RS-L11RS and
AirStation L07RS FS-L11RS FS
(See also operating instructions for the compressor
control DELCOS Pro LRS)
Standstill of the system
• When the system is at rest the intake regulator
(- 2 - Fig. 4) is closed.
• The solenoid valve (Y1 Fig. 4) is de-energised.
• The pressure reservoir (- 5 - Fig. 4) is bled via the
blow-off line (- 2.2 - Fig. 4) and the orifice (-9 - Fig. 4)
into the suction channel.
Starting the system
• The motor (- 3 - Fig. 4) starts up.
• The compressor extracts a certain volume of air via
a start valve (- 2.1 - Fig. 4). Pressure builds up in
the reservoir and closes the regulator.
• This way, constant pressure of approx. 4 to 4.5 bar
is maintained in the pressure tank (- 5 - Fig. 4), as
the pressure holding non-return valve (- 8 - Fig. 4)
still remains closed at this pressure level.
• Oil is supplied to the screw compressor (- 3 - Fig. 4)
due to the pressure differential between the
pressure reservoir (- 5 - Fig. 4) and the place of
injection in the screw compressor (- 4 -).
• If pressure in the load system falls below the
minimum pressure programmed on the control
system, the solenoid valve (-Y1- Fig. 4) is energized
and opened. Pressure then continues to build up in
the pressure reservoir (- 5 - Fig. 4).
• The minimum pressure valve (- 8 - Fig. 4) opens
when the pressure reservoir is approx. 4.5 bar.
• Compressed air is now delivered into the consumer
network.
Stopping the system
• After pressing the OFF button on the control panel
of the compressor control system DELCOS Pro
LRS, the magnet valve (- Y1 - Fig. 4) is de-
energized (closed) while the drive motor is still
running.
• The pressure reservoir (- 5 - Fig. 4) is depressurized
to a constant pressure of 4 to 4.5 bar.
• The drive motor (- 3 - Fig. 4) reduces its number of
revs to the set minimum value and comes to a
standstill after 30 seconds have passed.
• Once the drive motor has stopped, solenoid valve
(- Y1 - Fig. 4) is deenergized (closed) and the
remaining pressure in the reservoir is discharged via
the orifice (- 9 - Fig. 4).

CompAir L11 Specifications

General

Brand	CompAir
Model	L11
Category	Air Compressor
Language	English