The User Interface; Connections Between Boards; Slave Board Address; Power Supply To The Boards - Carrier 30GX Installation, Operation And Maintenance Instructions
Screw-compressor air- and water-cooled liquid chillers
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3.2.3 - The user interface
The user interface is in two parts:
•
The main interface: This gives access to all of the
control parameters for the unit. It consists of a 2-digit
primary display block and a secondary 4-digit display
block with 10 LEDs and 5 buttons.
•
The summary interface: This gives quick access to just
the main control parameters for the unit. It comprises 12
buttons and 16 LEDs, and includes a schematic diagram
of the unit.
3.2.4 - Connections between boards
The basic board and slave boards communicate with each other
over an internal three-wire RS485 communication bus (SIO
bus). These three wires link all the boards in parallel.
Terminals 1, 2 and 3 on connector J4 of the basic board are
linked to terminals 1, 2 and 3 of connector J3 (except for CPM
boards where terminals 2 and 3 are reversed). Incorrect
connection will render the system inoperative.
Fig. 1 - Internal bus wiring (between boards)
CPM
Basic
Compressor
board
board
3.2.5 - Slave board addresses
Every slave board (compressor board, 4xDO or 4xAI-2xAO
board) has an address which must be set up using the red SIO
address switch (marked SIO ADDRESS) at the top righthand
corner of each board. This switch consists of 8 DIP switches
(except for the CPM boards, equipped with four blue DIP
switches). The switch is disabled when it is in the OPEN
position - (for CPM boards refer to the text engraved on the
printed circuit board).
NOTE: Any incorrect address will prevent the unit from
starting. Turn off the power before amending the address of
any auxiliary board.
Fig. 2 - Address switch - marked "SIO ADDRESS"
1
2
3
6
4xDO
4AI-2AO
board
board
4
5
6
7
8
OPEN
Slave board addresses
BOARD
Board 4xDO #1 EXV circuit A
Board 4xDO #2 EXV circuit B
Board 4xDO #3 (fan module) #1
Board 4xDO #4 (fan module) #2
Board 4xDO #5 outputs compressor A1
Board 4xDO #6 outputs compressor A2
Board 4xDO #7 outputs compressor B1
Board 4xDO #8 outputs compressor B2
Board 4 x DO #9 heat reclaim module
Board 4xAI-2xAO #1
Board 4xAI-2xAO #2
Board 4xAI-2xAO #3
Blue address switch, CPM board (marked ADDRESS)
BOARD
CPM #1 (compressor A 1)
CPM #2 (compressor A 2)
CPM #3 (compressor B 1)
CPM #4 (compressor B 2)
3.2.6 - Power supply to the boards
The basic board, the summary interface and the accessory
CCN/JBUS board are supplied from a 24 V a.c. floating
supply. The other boards are supplied by sources that are
referred to earth.
BOARDS
Basic board
Summary interface
CCN/JBUS accessory
Compressor module A1
4xDO for A1
CPM A1
Compressor module A2
4xDO for A2
CPM A2
Compressor module B1
4xDO for B1
CPM B1
Compressor module B2
4xDO for B2
CPM B2
EXV Board
Board 4AI - 2xAO
Board 4xDO fan module #1
Board 4xDO fan module #2
* referred to earth
DIP SWITCH (0 = open)
1
2
3
4
5
6
0
1
0
0
0
0
0
1
1
0
0
0
0
0
1
1
1
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
0
1
0
1
0
0
1
1
0
1
0
0
0
0
1
1
0
0
1
0
1
1
0
1
0
1
0
0
0
0
0
0
1
0
0
1
1
0
1
0
DIP SWITCH (0 = open)
5
4
3
2
1
0
0
1
1
1
0
1
1
0
1
1
1
1
1
1
CONNECTOR/
SUPPLY
TERMINAL
24 V a.c./WIRES
J5/ O11-O12
011-012
J3
011-012
24 V a.c.
011-012
J1/011-012
11-1 - (12-1*)
PL-2/5 - 1
11-1 - (12-1*)
J1/011-012
11-2 - (12-2*)
PL-2/5 - 1
11-2 - (12-2*)
J1/011-012
11-3 - (12-3*)
PL-2/5 - 1
11-3 - (12-3*)
J1/011-012
11-4 - (12-4*)
PL-2/5 - 1
11-4 - (12-4*)
J1/011-012
11 - 12
J1/011-012
11 - 12
J1/011-012
11-11 - (12-11*)
J1/011-012
12-11 - (12-31*)
7
8
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
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