5. Operation
23
5.6 Controlling the air station
The GD Connect 12 offers various options for adapting
the air station to different requirements.
Profiles
A profile is a set of parameters corresponding to
different operating requirements of the station.
A profile contains the following parameters:
Max. pressure warning
Max. pressure
Min. pressure
Min. pressure warning
Receiver volume
Compressor priorities
Different set points can therefore be defined with
different profiles.
Activating a profile
If several profiles have been defined by the customer,
they can be activated in various ways:
a) Activation by timer control
The timer control allows profiles to be activated at a
predefined time. Fig. 9 shows an example of a weekly
program with different conditions of the customer's
plant.
Profile 1 = Normal production
Profile 2 = Weekend
Profile 3 = Retrofitting
Fig. 9 – Weekly program of the timer control
The timer control is programmed using channels.
For the example in Fig. 9, the programming is as
follows:
Channel 1:
Mon-Fri / 0..24h Profile 1 active
Channel 2:
Wed / 10..14h
Profile 3 active
Channel 3:
Sat / 0..24h
Profile 2 active
Sun / 0..24h
Station off
If no profile is active for a particular time range (on
Sunday in this example), the station stays off, i.e. the
compressors remain on standby, but are not loaded.
b) Activation by digital inputs or interface
A profile can also be activated by programmable inputs
or the serial customer interface.
The digital inputs can be located on the GD Connect 12
itself or on extension modules.
This allows the customer to either install a selection
switch in the plant or to activate a profile using a
separate PLC (as also shown in Fig. 2).
If no channel of the timer control is active, the station
can only be controlled by the digital input.
The customer can therefore "relocate" the programming
of the timer control to a separate PLC.
c) Activation by timer control and digital inputs or
interface
The combination of timer control and activation by
digital inputs or customer interface allows the customer
to activate profiles intermittently and outside the
programmed times without having to reprogram the
timer (e.g. unscheduled production or at the weekend or
for unplanned conversions).
This "overrides" the activation of a profile with the help
of a digital input or the serial interface of the currently
loaded profile timer.
