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1. DELCOS 3100 Electronics
35
1.7.7
Switching on-load/off-load by
remote control (version FS only)
Danger
In this operating mode, the compressor can start
automatically at any time!
Attention
It is only permissible to connect floating contacts
to the terminal strip. Interference voltages will
irreparably damage the DELCO3100.
The floating contacts must not be further than
20 metres from the terminal strip. If necessary,
coupling relays must be installed in the control
cabinet.
The control system provides the capability of switching
the compressor on-load and off-load externally by
connecting a floating contact
The remote on-load/off-load input (terminals
X3.23/X3.24) is always active, i.e. you do not need to
make any further settings in the DELCOS 3100 menu.
Operating principle:
Figure 1
Legend:
(1) Controller for switching compressor on-load/off-load
(2) Internal electronic pressure switch, see [CONTROL
MENU] for setting
(3) External floating contact for remote on-load
(4) Overpressure protection logic
•
During normal operation, the compressor's on-load/
off-load controller (1) is governed by the internal
electronic pressure switch (2). You program the
switching points of the internal electronic pressure
switch (2) in the [CONTROL MENU] menu using the
[CUT-OUT POINT] and [CUT-IN POINT] parameters.
•
The external floating contact (3) is parallel to the
internal pressure control (2).
•
A protective circuit (4) interrupts the function of the
external floating contact (3) if you have attempted to
operate the system 0.5 bar/7psi above rated operat-
ing pressure. The display shows [WARNING LINE
PRESS] while the external floating contact (3) is de-
activated. After acknowledging [WARNING LINE
PRESS] the external floating contact (3) is re-
enabled.
Note
By arranging the two pressure switches (2) + (3) in
parallel, the setting of the internal electronic pressure
switch (2) may have to be reduced in the [CONTROL
MENU] menu.
To deactivate the internal electronic pressure switch (2)
or connect an external floating contact for remote on-
load in series, see Chapter 1.7.8.