Liebert AC4 manual Hardware and Components, Enclosure, Controller Board, Keypad Display

Hardware and Components

The AC4 comes standard with an enclosure, a controller board and a liquid crystal display (LCD).

AC4 enclosure - Internal features

Back of LCD

Controller Board

	Knockouts and access slots
Ground wire for LCD	(top and bottom)

Enclosure

The AC4 enclosure features a key lock for added security. The enclosure is made of metal to accommodate secure conduit fittings and protect components against environmental debris.

AC4 enclosure - External features

Knockouts and	Key
access slots	lock
on top and
bottom

LCD for configuration and operation

•The enclosure is designed for easy wire routing and terminations. Access slots for communication cables and network wires are located on both the top and bottom of the enclosure.

•The enclosure is 2-3/4" deep, allowing for recess mounting in a wall. The enclosure may also be flush-mounted.

•The enclosure houses the LCD and the controller board.

Controller Board

The controller board supports a total of 10 points (four digital inputs, four digital outputs and two Common Alarm outputs).

Point Type	Point Count
Digital input	4
Digital output	4
Common Alarm output	2

The digital inputs are dry contacts. The digital outputs and Common Alarm outputs are Form C contact relays. The Common Alarm output is one output with two sets of contacts.

The point terminations are made using remov- able terminal blocks. This allows for easier access to the terminators, streamlining the pro- cess of connecting external devices to the AC4.

The controller board is a microprocessor-based platform for program execution.

The firmware, including the operating system and user-defined data, is stored in nonvolatile flash read-only memory. Flash ROM may be easily upgraded at the job site, simplifying the process of installing new firmware as it becomes available.

An RS232 operator terminal port is included with each controller board for operator devices such as a simple CRT terminal or laptop PC.

Keypad Display

The keypad display is a user interface mounted on the enclosure door of the AC4.

The display provides for complete monitoring and configuration of the panel and is password-protected.

The keypad display provides the ability for the AC4 to operate as a complete standalone panel.

Keypad display

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