Ideal for coordinated control of systems with redundant equipment.

The Liebert Controllers are ideal for coordinated control of systems with redundant equipment, such as multiple environmental units or pumps. When the controller detects an alarm in an operating device, a standby device is enabled and the device in alarm is either disabled or left operating as configured.

The controllers can also balance usage of devices by rotating devices through Operating and Standby modes according to a user-defined schedule. This helps keep redundant equipment operating efficiently and only when needed. The controller 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 controllers is monitoring the status of connected devices and keeping personnel apprised through local alarming. The controllers 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 controllers have a local LCD interface and an RS232 interface.

When an alarm condition arises, the Controller 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.

Ideal Applications

• Redundant Environmental units
• Redundant Pumps
• Redundant Dampers
• Redundant Fans

Product Features

• 4 device control - AC4
• 8 device control - AC8
• Custom configuration for specific applications and equipment
• Alarm logs with time and date stamp
• LCD and RS23 connection for set-up, configuration and monitoring
• Ability to back-up and restore configuration file
• Local alarm notification
• Staging of devices in all four zones – AC8 only