5. Operation
24
Line pressure regulation
To regulate the line pressure within the pressure band,
the GD Connect 12 loads the compressor with the
following criteria:
Criterion 1: Priority
Compressors with the highest priority will be loaded
first, followed by compressors with lower priorities.
There are four priorities available:
High
These compressors will be loaded first.
Normal
These compressors will be loaded once all high-
priority compressors have been loaded.
Low
These compressors will be loaded once all high-
priority and normal-priority compressors have been
loaded.
Off
These compressors will never be loaded.
Criterion 2: Demand
If several compressor with the same priority could be
switched, the compressor will be switched which
corresponds to the delivery of the identified additional
need of compressed air.
Criterion 3: Total hours
If several compressors with the same FAD could be
switch, the compressor with the lowest number of total
hours will be loaded first.
In addition to the listed criteria, the following parameters
are relevant for the switching of compressors:
Switch on and switch off delay
If a compressor is to be loaded or unloaded, a timer is
started with the appropriate adjusted time.
If the timer runs out and conditions for switching the
compressor are still valid, the compressors are
switched.
Pressure above "Max. pressure warning"
If the pressure exceeds the adjusted value of “Warning
line pressure max.”, all compressors are unloaded at
the same time and an appropriate message is
displayed.
Pressure below "Min. pressure warning"
If the pressure falls below the adjusted value of
"Warning line pressure min.“, all available compressors
are loaded and an appropriate message is displayed.
Failure of the GD Connect 12
If communication between the GD Connect 12 and the
compressors fails due to a broken cable or power loss,
the compressors are switched over automatically to
their internal pressure regulation after 10s.
