System Options Menu
Page 75
A/C Fail Reporting
This determines how the control unit monitors the AC mains supply input.
On
The mains supply is monitored. A loss of supply is reported according to
Mains Fail
Delay
, as described next.
Off
The mains supply is not monitored.
Mains Fail Delay
This option allows you to specify the length of time (0 to 60 minutes) that the control unit
must wait after detecting a mains supply failure before reporting Mains Fail to the ARC.
When the mains supply fails, the control unit lights the red alert LEDs around the
navigation key within a few seconds of the failure, activates any output programmed as
General Fault and logs the Mains Fail event (in the mandatory log).
Note:
The control unit does not show alerts while the system is set.
The control unit does not report power interruptions of less than 9 seconds to the ARC. If
power is restored within that time, the control unit switches off the red LEDs, deactivates
the General Fault outputs and logs Mains Restore.
If the power interruption lasts for longer than 9 seconds, the subsequent additional actions
depend on the value in
Mains Fail Delay
:
If
Mains Fail Delay
is set to 0, the control unit starts an alert tone ten seconds after
the power interruption and communicates a Mains Fail to the ARC. At the same
time, the control unit activates any outputs of type AC Fail.
If
Mains Fail Delay
is set to 1-60 minutes, the control unit starts the delay time ten
seconds after the power fail.
If power is restored before the end of the delay, the control unit switches off the red
LEDs, deactivates any General Fault outputs and logs Mains Restore. The control
unit does not send any report to the ARC.
If the power fail condition is still present at the end of the delay, the control unit
starts an alert tone at internal sounders and communicates a Mains Fail to the ARC.
At the same time, the control unit activates any outputs of type AC Fail.
A user can silence the alert by pressing the navigation key and entering a valid access
code. The control unit displays details of the alert. The General Fault and AC Fail outputs
remain active.
Once mains power is restored, the control unit deactivates any AC Fail outputs and logs
Mains Restore. A user can reset the alert and deactivate any General Fault outputs by
pressing the navigation and entering the access code again.
External PSUs
If the system has an external PSU connected to a zone with type External PSU AC Fail,
the control unit treats a mains fail at the external PSU in the same way as a mains failure
at the control unit, with one difference concerning reporting to the ARC:
If the control unit and external PSU both experience individual mains failures, but starting
at different times, as long as those mains failures overlap and together last for more than
the
Mains Fail Delay
period, the control unit will activate any AC Fail outputs and report a
