Liebert AC8 manual Hardware and Components, Enclosure, Keypad Display, Controller Board

Hardware and Components

Enclosure

The AC8 comes standard in an enclosure, which features a key lock for added security. The enclosure is made of metal to accommodate secure conduit fittings and protect components against environmental debris.

AC8 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 controller board and Transformer Module.

Keypad Display

The keypad is a user interface mounted on the enclosure door of the AC8. The liquid crystal display (LCD) provides for complete

monitoring and configuration of the Keypad panel and is password-protected.

The keypad display provides the ability for the AC8 to operate as a complete standalone panel.

Controller Board

The controller board supports these connections:

•Eight devices, with 1 digital input and 1 digital output per device

•Up to four zones, with staging for each zone

•Four 4-20mA analog inputs (one sensor per zone)

•Two programmable digital relay outputs

•Two Common Alarm outputs

•One EPOP input

The digital inputs are dry contacts. The analog inputs are 4-20mA inputs. The digital outputs, programmable relay 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 removable terminal blocks. This allows for easier access to the terminators, streamlining the process of connecting external devices to the AC8.

The controller board is a microprocessor-based platform for program execution. The firmware may be easily upgraded at the job site, simplifying the process of installing new firmware as it becomes available. Configuration data is stored in nonvolatile EEPROM to protect against power loss.

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

An integrated on-board modem allows remote access to the AC8. The modem is factory-configured, eliminating field configuration and wiring requirements. An RJ11 phone modem jack is also included.

An IGM422 connection permits access to Liebert’s SiteScan Web Enterprise Monitoring System. This connection allows information and alarms to be monitored from a centrally located command center.

AC8 Components and Key Features

Power On/Off switch Battery pack Audible horn

Transformer

Module

					TB5: COMMON ALARM
						RELAY OUTPUTS
Manual Override					NO C NC	NO C NC	(TOP)	TB3, TB4, TB5
					+	BOTTOM		OUTPUT RELAY
								RATINGS: 24V, 3A
Switch (outputs)								CLASS 2 ONLY.
	TB7:	START			Q11
					ENABLE	TOP		TB4:
	24V INPUT				AUDIBLE
			BARCODE	LIEBERT				NO	(BOTTOM)
	P23:								NC
								C	NO
		BATTERY						NC	C
	BATTERY								2

Common Alarm connectors

Control relay outputs

Modem

Phone line connector

ON

Power On/Off

switch

LCD
CONTRAST
VBATT	RELAY
	OUTPUTS
	(BOTTOM)
	(TOP)
CAN TX	8
CAN RX	4
	7
	3

6

2

5

1

	MODEM					REV	(BOTTOM)
							(TOP)
							8
							4
							7
							3
							6
							2
							5
							1
						ASS	TB2:
							CONTACT
			31--42			TB1	INPUTS
				BOTTOM		EPOP INPUT
				TOP
						EPOP
	MODEM					P19
						EPOP
J11: PHONE						DIS EN	TB1: EPOP
		485					CONTACT
PIN 3-TIP
PIN 4-RING	(TOP)	+ —	+ — + —				INPUT
		422	AG		TB9: ANALOG	TB1, TB2 INPUTS:
	(BOTTOM) + —		+ — + —		GROUND	DRY CONTACTS ONLY.

Digital output connectors

Digital input connectors

EPOP contact input

Power receptacle

Serial interface	SiteScan Web
connector (RS232 / EIA574)	connector (EIA422)

Analog input connectors

2