Liebert RAC2-8 Restart Delay, Restore, Running Units, Shutdown, Site ID, SiteScan, Standby Units

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Section 4: Glossary of Control Functions

Restart Delay

The length of time between a request to turn ON a unit and when the unit is actually turned ON. Also the length of time between the start of each successive unit after power is applied or restored. This delay prevents an excessive inrush current demand on the power source. Restart Delay is typically very short and is user selectable from the display. Range—0.1 to 60 minutes, in increments of 0.1 minute (6 seconds).

Restore

To return a Forced ON or Forced OFF unit to normal control. Refer to

Override.

Running Units

The units selected to be ON during an operating mode. Select Running units from the display. Units not selected for Running status are given Standby status. Running units can be turned OFF by Autochangeover, Autosequencing, or Standby Testing.

Shutdown

When a Running unit is in an alarm condition, it can be programmed to remain running or be shut down. Select Shutdown (Yes or No) from the display.

Site ID

The user assigned identification of this facility (up to 20 characters).

The Site ID is included in alarm messages dialed out by the modem.

Assign the Site ID from the terminal.

SiteScan

A Liebert site monitoring system. The RAC2-8 sends information to

SiteScan if a system is connected to the EIA-422 port.

Standby Testing

When Standby Testing is ON the RAC2-8 periodically starts the Standby unit(s) to test operation. The time between these tests is the Interval. Standby Testing ON/OFF, Interval (in days), and time of day for testing are user selected from the display. Standby Testing and Autosequencing cannot both be ON at the same time.

Each time a test is performed, the Standby unit(s) operate for a time equal to the Hold Delay plus the Alarm Delay. At the end of this period operation returns to the Running unit(s). If an alarm occurs and does not correct itself by the end of the test time, an alarm is displayed and annunciated.

Standby Units

The units selected to be OFF during an operating mode. Select Standby units from the display. Units not selected for Standby status are given

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Contents $XWRð&KDQJHRYHUý&RQWUROOHU Table of Contents Table of Figures Unit RAC2-8Page Introduction Page Installation To start up the RAC2-8Operation Page Glossary of Control Functions for more details OperationStatus Sub-menu Sequencing Status Screens cont’dUnits DelayStatus Sub-menu cont’d Set Options Sub-menuSet Options Sub-menu cont’d Function Delays TEMP/HUM Standby PasswordAlarm Sub-menu DAY of Week Set Clock Sub-menuDate TimeUnit 01 Forced on Force OFF Restore Return LOG on TerminalStatus Screen Unit Status Setup Zones/Units OptionsSetup Zones/Units Options cont’d Number of ZONES/NUMBER of Units PER ZoneEmergency Power Units Unit Shutdown on Alarm08 0 no Alarms Review and Alarms Clear Unit LabelsSet Clock Override a Unit Set Modem Options Setup Temp/Humid Options Setup Temp/Humid Options cont’dSet Modem Options cont’d Setup Standby Unit Options Set New Password Display SS Alarm BlockList of Alarms AlarmsAutochangeover Alarm AnnunciationAlarm Communications Alarm DelayAutosequencing Key Clear AlarmsCommon Alarm-Inputs Common Alarm-OutputHold Delay DelayEmergency Power OFF EPO Emergency Power OperationInterval Humidity AlarmsHumidity Lockout Inactive UnitOverride Normal TemperaturePassword Power Failure ModeRunning Units Restart DelayRestore Standby TestingTerminal Temperature AlarmsTemperature Sensitivity Temperature StagingZones 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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