![background image](http://html1.mh-extra.com/html/gardner-denver/gd-connect-12/gd-connect-12_manual_3574503032.webp)
6. Compressor module (STD)
32
"Operation" digital input
A signal must be connected to this input to indicate that
the compressor is ready to produce compressed air
after sending a remote load signal.
On compressor controls which do not provide such a
signal the input can be connected to the collective fault
signal of the compressor.
This will indicate to the GD Connect 12 that there is no
fault at the compressor.
A parameter on the GD Connect 12 can be used to
define whether or not a voltage at the input signals
availability.
"Motor" digital input
Contacts A1 and A2 of the main contactor coil can be
connected directly to this input.
If the compressor control energizes the coil of the main
contactor, the compressor module detects the voltage
over the coil and indicates to the GD Connect 12 that
the motor is running.
On compressor controls without a main contactor, any
output can be used which indicates that the motor is
running, e.g. a fan contactor or a soft starter signal.
A parameter on the GD Connect 12 can be used to
define whether or not a voltage at the input signals that
the motor is running.
"Load" digital input
The contact regulation valve coil can be connected
directly to this input.
If the compressor control energizes the coil of the
regulation valve, the compressor module detects the
voltage over the coil and indicates to the GD Connect
12 that the compressor is on load.
On compressors with half/full load regulation, this input
should indicate whether the compressor is in half or full
load.
Any output which indicates that the compressor is on
load could also be used.
A parameter on the GD Connect 12 can be used to
define whether or not a voltage at the input signals the
compressor load.
Digital outputs
Danger
When a compressor module (STD) is installed, the
compressor's pressure switch can no longer
provide over-pressure protection.
For compressors that are not equipped with
independent over-pressure detection, it is
recommended that a pressure switch be
incorporated in the compressor fault circuit(s) such
that any local over-pressure condition will stop the
compressor independently from the GD Connect 12.
The compressor is controlled by two or three digital
outputs. The status of these outputs is indicated via
three LEDs.
These digital outputs are change-over contacts and can
be adapted to the requirements of the compressor
control by selecting the appropriate terminals.
Wiring diagrams with examples showing how to connect
a compressor control with line pressure sensor or line
pressure switch can be found in the annex.
"Remote load enable" digital output
Do not use this input to switch the compressor on and
off.
This output should cause a change-over from internal
regulation to the control via the digital outputs of the
compressor module.
"Remote load" digital output
Do not use this input to switch the compressor on and
off.
This output switches the compressor to load.
This remote load signal should then be effective when
the "remote load enable" output is sent to the
compressor control.
"Remote half load" digital output
Do not use this input to switch the compressor on and
off.
On compressors with half/full load control, this output
should switch the compressor to half load.
This remote load signal should then be effective when
the "remote load enable" output is sent to the
compressor control.