Section 4: Glossary of Control Functions
unit is turned ON. During the Hold Delay no alarms are annunciat ed
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 annunciat ed
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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