Liebert RAC2-8 manual Autosequencing

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Section 4: Glossary of Control Functions

unit is turned ON. During the Hold Delay no alarms are annunciated from the started unit or any unit in the system.

If the Standby unit has an alarm, the Running unit is restarted if DIP switch 1-8 is ON. Also, whenever the alarm is cleared in a Running unit, the unit is turned on and the Standby unit is turned off.

Autosequencing

An optional operating mode in which Standby units are periodically sequenced to RUN to balance operating time among all units. Select Autosequencing ON or OFF from the display. Note that Autosequencing and Standby Testing cannot both be ON at the same time.

When Autosequencing is ON, periodically the Standby and Running units are changed to balance unit running time. This interval (in days) and time of day are user selected from the display. When this changeover Occurs, the Standby unit becomes a running unit, and the Running unit that has been running the longest becomes the Standby Unit. Messages are written to the terminal to record the status changes. Status screens show new unit status at the local display.

After a changeover, the newly started unit may briefly have a High Temp or other alarm. A user selectable Hold Delay begins when any unit is turned ON. During the Hold Delay no alarms are annunciated from the started unit or any unit in the system. If the newly started unit has an alarm at the end of this delay (plus the Alarm Delay), this unit is shut down, and the previously running unit is restarted. An alarm is indicated on the LCD and the alarm is annunciated.

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Contents $XWRð&KDQJHRYHUý&RQWUROOHU Table of Contents Table of Figures RAC2-8 UnitPage Introduction Page To start up the RAC2-8 InstallationOperation Page Operation Glossary of Control Functions for more detailsSequencing Status Screens cont’d Status Sub-menuDelay UnitsSet Options Sub-menu Status Sub-menu cont’dSet Options Sub-menu cont’d Function Delays TEMP/HUM Password StandbyAlarm Sub-menu Time Set Clock Sub-menuDate DAY of WeekUnit 01 Forced on Force OFF Restore Return Terminal LOG onStatus Screen Number of ZONES/NUMBER of Units PER Zone Setup Zones/Units OptionsSetup Zones/Units Options cont’d Unit StatusUnit Shutdown on Alarm Emergency Power Units08 0 no Unit Labels Alarms Review and Alarms ClearSet Clock Override a Unit Set Modem Options Setup Temp/Humid Options cont’d Setup Temp/Humid OptionsSet Modem Options cont’d Setup Standby Unit Options Display SS Alarm Block Set New PasswordAlarms List of AlarmsAlarm Delay Alarm AnnunciationAlarm Communications AutochangeoverAutosequencing Common Alarm-Output Clear AlarmsCommon Alarm-Inputs KeyEmergency Power Operation DelayEmergency Power OFF EPO Hold DelayInactive Unit Humidity AlarmsHumidity Lockout IntervalPower Failure Mode Normal TemperaturePassword OverrideStandby Testing Restart DelayRestore Running UnitsTemperature Staging Temperature AlarmsTemperature Sensitivity TerminalZones Installation TB2 RAC2-8 Dimensional Enclosure Diagram RAC2-8 Component Arrangement RAC2-8 Connection Diagram RAC2-8 Switch and Jumper Settings
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