5. Design and functioning
22
Stopping the system
•
To de-energize the solenoid valves (- 19 - (Y1) and
- 20 - (Y4) ) press the OFF push-button on the
keypad of the compressor control GD Pilot TS.
•
The pressure control valve (- 2.2 -) in the suction
regulator (- 2 -) closes and the pressure reservoir is
unloaded to atmospheric pressure.
•
After 30 seconds, the drive motor (- 3 -) and the
cooling fan motor (-26 -) are shut down.
Automatic operation (open-close operation)
•
When the pressure reaches the upper switching
point set on the system pressure sensor (- 28 -
(B1)), solenoid valves (- 19 - (Y1) and - 20 - (Y4))
are de-energized.
•
The pressure control valve (- 2.2 -) closes.
•
This is due to the fact that the lower control chamber
of the actuator (- 2.1 -) is charged with pressure by
the de-energized solenoid valve (-19 - (Y1)), and the
upper control chamber is bled via the solenoid valve
(-20- Y4).
•
The pressure reservoir (- 6 -) is unloaded to off-load
pressure (residual pressure).
•
The screw compressor (- 4 -) is now running in the
offload mode.
•
The cooling fan motor (- 26 -) is switched on or off in
dependence upon the final compression
temperature.
•
If the pressure at the system pressure sensor
(- 28 - (B1)) does not fall to the set setpoint pressure
within the pre-set motor run-on time (e.g. 120
seconds), the drive motor (- 3 -) and the cooling fan
motor (- 26 -) are shut down and the system
unloaded to atmospheric pressure.
•
The system is now in the „stand-by“ mode and can
re-start at any time when the network pressure falls
to the set setpoint pressure (see section „starting
the system“).
•
If the pressure at system pressure sensor (- 28 -
(B1) falls to the setpoint pressure before the pre-set
motor run-on time has elapsed, the solenoid valves
(- 19 - (Y1) and - 20 - (Y4) ) are again energized.
•
The unit now changes over to on-load operation.
Summary of Contents for L30RS
Page 2: ......
