5. Extended functions
19
5.8.2 On-load/off-load remote control
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
DELCOS
Pro
.
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.
The DELCOS
Pro
control system allows the operator to
switch the compressor into on-load or off-load from a
remote point through the connection of two potential-
free contacts. This function is needed when using an
external control for example.
To do this, go to the
[OPTIONAL
IN-/OUTPUTS]
menu where you must program one input with the
ENAB.REM.LOAD
function and another with the
REMOTE
LOAD
function. The unit can now be switched to
on-load or off-load using these two inputs.
You will find a circuit diagram in Fig. 6. In our
explanation, we have assigned the inputs as follows:
INPUT
1:ENAB.REM.LOAD
INPUT
2:REMOTE
LOAD
You can of course program the inputs any way you
choose.
If input 1 is activated, the unit can only be switched into
on-load or off-load by remote control. Both pressure
ranges and time control mode are interrupted
(decoupled). If input 2 is now activated, the machine is
in on-load. If input 2 is not activated, the machine is in
off-load.
If the supply pressure exceeds the preset operating
pressure of 0.5 bar, the
WARNING LINE
PRESS
indication appears on the display. Remote control is
deactivated at the same time. The unit now runs again
using one of the preset pressure ranges until the
WARNING LINE
PRESS
is acknowledged.
CUT-OUT POINT
CUT-IN POINT
p2 CUT-OUT
p2 CUT-IN
INPUT X:
REMOTE LOAD
p2 TIMER CONTROL
INPUT X:
2nd PR. RANGE
INPUT X:
ENAB.REM.LOAD
WARNING
LINE PRESS
ON-LOAD
Fig. 6 On-load/off-load remote control circuit diagram
