Liebert AC4 manual Description, Features and Benefits, Product Specification/Installation Sheet

AC4

Product Specification/Installation Sheet

Description

The Liebert AC4 is ideal for coordinated control of systems with redundant equipment, such as multiple environmental units or pumps. When the AC4 controller detects an alarm in an operating device, the AC4 enables a standby device and controls the device in alarm as configured, either leaving that device operating or disabling it.

The AC4 controller can also balance usage of devices by rotating

units through Operating and Standby modes according to a user-defined schedule. This helps keep redundant equipment operating efficiently and only when needed. The AC4 can perform routine testing of standby devices and alert personnel if a standby device fails an operating test and requires attention.

Another capability of the AC4 is monitoring the status of connected devices and keeping personnel apprised through local alarming.

The AC4 controller can interface with anything that closes an electrical contact. To improve process efficiency and troubleshooting, the controller tracks data in two types of logs: alarm and event. The AC4 has a local LCD interface and an RS232 interface.

When an alarm condition arises, the AC4 displays alarm information, sounds an audible alarm, changes the state of the common alarm relay and turns connected devices on or off according to user configuration.

For other applications, contact your local Liebert representative or call 1-800-222-5877.

Features and Benefits

•Custom configuration for specific applications

•Alarm and Event logs with time and date stamp

•Backup and download configuration files

•User interface for configuration and monitoring via local LCD or RS232 port

•On-board audible alarm

•Configuration data and operating program permanently stored in nonvolatile Electrically Erasable Programmable Read Only Memory (EEPROM) for protection against power loss

•Real-time clock

•Status LEDs for verification and diagnostics

AC4 Components and Key Features

Power On/Off switch	Audible horn	Audible horn	Common Alarm connectors
		jumper

Digital output status LEDs

24VAC power connector

	Manual Override Switch
LCD contrast	(outputs)
adjustment	Digital output connectors
LCD connector	Status LEDs
DIP switch 1	Digital output loss-of-power
	jumper

Digital input connectors

Serial interface connector	Digital input status LEDs
(RS232/EIA574)

1