4. Design and functioning
23
Automatic operation
• If the mains pressure achieves the preset maximum
value, then the electric motor (-3-) will have its
speed lowered in order to allow for the delivery
amount to adapt to the actual need for compressed
air.
• If the motor has reached minimum speed and the
load-system pressure continues to rise, solenoid
valve (-25-(Y4)) is deenergized (opened) and
solenoid valve (-26-(Y11)) continues energized
(open). Reservoir pressure is reduced to approx. 4 to
4.5 bar and the pressure-maintenance valve (-7-)
closes.
• This way, no more compressed air will be supplied
to the mains.
• If the mains pressure does not drop to the target
value within the programmed follow-up time, then
the system will shut down.
• If the target value is achieved before the expiration
of the programmed motor follow-up time, then the
magnet valve will again be energized (-25-(Y4)).
• The system will then go into load runs.
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