Carrier 30GK HARDWARE DESCRIPTION 3.1 - General Control board, Electronic boards, The basic board

3 - HARDWARE DESCRIPTION

3.1 - General

Control board

The various control components are arranged in modules within the control cabinet:

•	Control module: This comprises the basic board, the
	user interface, the EXV control board and option boards,
	as well as the customer’s terminal block.

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• Start-up module: This consists of the start-up boards,

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Legend 7 6 5

1CCN connector

2Red LED, status of the board

3Green LED, communication bus SIO

4Orange LED, communication bus CCN

5Remote master board customer control connection contacts

6Remote master board customer control connection signal

7Remote master board customer report connection contacts

8Master PD4 basic board

9CCN/clock board

The control system consists of at least a PD4 basic board, a user interface, a PD4-EXV slave board and, depending on the application, one or more RCPM compressor boards, 4xDO boards or 4xAI-2xAO boards and an NRCP-BASE slave board. Slave boards are connected to the basic board via an internal communication bus (SIO).

The CCN/clock board is connected and screwed to the master basic board. It permits communication with elements of the Carrier Comfort Network via the CCN bus.

	compressor protection boards, as well as the compressor
	circuit breakers and contactors.
•	Fan module (air-cooled unit): Consists of one or two
	4xDO boards together with the fan circuit breakers and
	contactors.

3.2 - Electronic boards

3.2.1 - The basic board

It can be used alone or in conjunction with slave boards. It holds the program that controls the machine. It continuously manages the information coming in from the various pressure and temperature sensors, and communicates with the slave boards via the SIO bus. It can also communicate with elements of the Carrier Comfort Network via the CCN bus.

NOTE: After a power cut the unit restarts in the same operating mode as before the power cut.

3.2.2 - Slave boards

•Compressor board RCPM: This board is used to control a compressor. Up to eight RCPM boards can be connected to the basic board.

•4xDO board: This board can be used to control fan stages.

•PD4-EXV board: This board can control two EXV valves and two suction temperature sensors.

•4xAI-2xAO board: This optional board can be used to read sensors (oil pressure), or to control variable speed fans (air-cooled units) or the condenser valve (water-cooled units).

•NRCP-BASE board: This optional board is used to control the inputs and outputs of the heat reclaim option.

Control box

Legend		3	Compressor start-up module
1	Power supply disconnect switch	4	Control system
2	Fan start-up module	5	User interface

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