System Options Menu
Page 76
mains fail to the ARC. If the mains failures do not overlap, and are both individually shorter
than the
Mains Fail Delay
period, the control unit logs the events and activates any
General Fault outputs, but will not send a report to the ARC.
If the external PSU is allocated to a partition, and mains power at the external PSU is off
for longer than the Mains Fail Delay period, the report to the ARC can show that the
partition experienced a mains fail. This report is additional to any report the control unit
might send concerning a mains fail at the control unit.
The control unit provides different methods of reporting to the ARC. For mains fail
reporting each method differs in the detail that it can send:
SIA/CID reports can indicate mains failure in individual partitions.
Fast Format reports cannot show details of mains failure in partitions, only mains
failure as a system-wide fault. This means that although the system can report that
a mains failure occurred, it cannot show whether the failure was in the control unit
or in an external PSU.
Event Sequence
Report Timing
The control unit mains fails and the remote
PSU mains fails within 10s.
The control unit waits for the mains fail
delay and then starts an alert and reports
a mains fail.
There is a delay of more than 10s but less
than the mains fail delay between a mains
fail at the control unit and a mains fail at
the remote PSU.
The control unit illuminates the red LEDs
around the navigation key after 10
seconds of the initial mains fail and then
starts waiting for the selected mains fail
delay. However, when the remote PSU
mains fails, the control starts an alert and
reports mains fail immediately.
There is a mains fail at the control unit,
followed by a mains fail at the external
PSU after the selected mains fail delay
has expired.
The control unit lights the red LEDs after
10 seconds of the initial mains fail and
then starts an alert and reports mains fail
at the end of the selected mains fail delay.
The control then logs the mains fail of the
remote PSU.
The remote PSU experiences a mains fail.
After 10s, the control unit illuminates the
red LEDs, starts an alert and reports a
mains fail.
The remote PSU experiences a mains fail
and then the control unit experiences a
mains fail within the next 10s.
After the selected mains fail delay, the
control unit illuminates the red LEDs,
starts an alert and reports a mains fail.
The remote PSU experiences a mains fail
and then the control unit experiences a mains
fail AFTER the next 10s.
After 10s, the control unit illuminates the
red LEDs, starts an alert, and reports a
mains fail. When the control unit mains
fails, the control unit logs the event after
the selected mains fail delay.
