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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
34 • User Manual (9/97)