5. Extended functions
19
5.8 Remote control
5.8.1 Remote control for pressure
changeover
Danger
In this operating mode, the compressor may start
automatically at any time.
Attention
Only potential-free contacts may be connected to
the terminal strip. External voltages will destroy the
GD Pilot.
The potential-free contacts must not be more than
20 metres away from the terminal strip.
If necessary coupling relays must be fitted in the
control cabinet.
CUT-OUT
POINT
TARGET PRESSURE
p2
CUT-OUT
p2
TARGET PRESSURE
p2
TIMER
CONTROL
Input X:
2nd pressure
range
ON-LOAD
Fig. 5 Circuit diagram for pressure changeover.
Sections 5.1.2 and 5.3.2 contain explanations of how to
set the second pressure range and the possibility of -
timer operations with the second pressure range.
But you can also activate the second pressure range
remotely. This is done using a digital input (input X in
Fig. 5) on the GD Pilot (see section 5.5.1 and circuit
diagram).
In the
[OPTIONAL
IN-/OUTPUTS]
menu you have to
program the inputs using the
2nd PR. RANGE
function.
A potential-free contact can now be connected to the
terminal strip of the programmable input. If this contact
is closed, the system changes over to the second
pressure range.
5.8.2 Enabling on-load operation
Danger
In this operating mode, the compressor may start
automatically at any time.
Attention
Only potential-free contacts may be connected to
the terminal strip. External voltages will destroy the
GD Pilot.
The potential-free contacts must not be more than
20 metres away from the terminal strip.
If necessary coupling relays must be fitted in the
control cabinet.
CUT-OUT
POINT
TARGET PRESSURE
p2
CUT-OUT
p2 TARGET
PRESSURE
p2
TIMER
CONTROL
INPUT X:
2nd
PR.
RANGE
INPUT X:
OPERATE_B1
ON-LOAD
Fig. 6 On-load/off-load remote control circuit diagram
The GD Pilot control system allows the operator to
switch the compressor into off-load from a remote point
through the connection of a potential-free contact. This
function is needed when using an external control for
example.
