Liebert AC8 manual Description, Features and Benefits

AC8

Product Specification/Installation Sheet

Description

The Liebert AC8 is ideal for coordinated control of systems with redundant equipment, such as multiple environmental units or pumps. When the AC8 controller detects an alarm in an operating device, the AC8 enables a standby device and controls the device in alarm as configured, either leaving that device operating or disabling it.

The AC8 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 AC8 can perform routine testing of standby devices and alert personnel if a standby device fails an operating test and requires attention.

The staging feature permits standby devices to be turned on or off when a sensor detects specified levels. For example, the AC8 might be configured to turn on a fan when the temperature reaches 75°F, then turn on a second fan at 80°F.

When the temperature falls below 80°F, the second fan is turned off; when it drops below 75°F, the first fan is turned off. Liebert’s TW420 Temperature Transmitter may be connected to any of the four analog sensor inputs for staging and other functions.

Another capability of the AC8 is monitoring the status of connected devices and keeping personnel apprised through local alarming. The AC8 employs local alarming and remote paging services to keep personnel on-site and at remote locations apprised of the status of equipment.

The AC8 controller can interface with anything that closes an electrical contact. To improve process efficiency and troubleshooting, the controller tracks data in three types of logs: alarm, event and trend.

The AC8 has both a local LCD interface and a remote dial-up interface for configuration and monitoring. Liebert’s SiteScan Web may also be used for monitoring, as well as some configuration functions.

When an alarm condition arises, the AC8 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. If configured, the controller also sends pager notifications.

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

Features and Benefits

•Custom configuration for specific applications

•Paging capability—up to four pager numbers

•Preconfigured on-board modem

•Alarm, Event and Trend logs with time and date stamp

•Battery backup to ensure alarm notification

•Backup and download configuration files

•User interface via RS232 or modem connection

•On-board audible alarm

•Configuration data permanently stored in non- volatile Electrically Erasable Programmable Read Only Memory (EEPROM) for protection against power loss

•Real-time clock

•Status LEDs for verification and diagnostics

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