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4. Features of the system
17
4.5 Scope of delivery
After receipt, check the scope of delivery:
GD Connect 12 control cabinet
incl. cable glands
2 coded plugs (4-pin)
for the RS485-1 and RS485-3 interfaces
Line pressure sensor
Plug kit to connect the compressor controllers
SD card
Wiring diagram
CD-ROM with manuals
Quick Start Guide incl. drill template for mounting
The drill template can also be found in the annex.
4.6 System components
Analog inputs
There are two analog inputs (4..20mA) on the GD
Connect 12:
Analog input AI-1
This is fixed assigned to the "Line pressure 1" function.
The scaling is adjustable in the menu "Adjustments GD
Connect 12 " menu, "Inputs/Outputs" sub-menu.
Either a passive or active 4..20mA sensor can be used.
Analog input AI-2
This input can be set to different functions and scalings
in the menu "Adjustments GD Connect 12" ,
"Inputs/Outputs" sub-menu.
Either a passive or active 4..20mA sensor can be used.
Information on how to connect the analog inputs can be
found in the annex.
General information on connecting compressors
Compressors are connected to the GD Connect 12 via
the RS485-1 interface only.
The RS485 interfaces of the GD Connect 12 and the
compressor controls should form a bus structure, i.e. all
compressors are connected in series, starting from the
GD Connect 12.
Fig. 3 shows examples of correct and incorrect wiring of
the compressor station.
C1 . .C3
Fig. 3 – Wiring of the compressor station
Connecting Gardner Denver compressors
GD compressors can be connected directly to the GD
Connect 12 via their RS485 interfaces.
Note
In order to operate correctly, the appropriate minimum
software version must be installed on the controllers.
The minimum software versions are listed in the
overview in section 4.2.
Note that the RS485 interfaces of the compressor
controls have been set to the correct values for
Protocol
Baudrate
Address
Further information on the connections (wiring diagrams
and compressor control settings) can be found in the
annex.
C1
C2
C3
Incorrect
GD
Conn.12
GD
Conn.12
C1
C2
C3
Correct
C1
C2
C3
GD
Conn.12
Incorrect
GD
Conn.12
C1
C2
C3
Correct