7.9 Power management alarms
7.9.1 Breaker # feedback position failure
This alarm is for an externally controlled breaker or redundant breaker feedback position
failure.
The alarm is based on the externally controlled breaker feedback signals, which are digital
inputs to the controller. The alarm is activated if the breaker Closed and Open feedbacks are
both missing for longer than the delay time. The alarm is also activated if the breaker Closed
and Open feedbacks are both present for longer than the delay time.
0
1
Breaker
open
feedback
Time
Delay
Breaker
closed
feedback
Breaker
position
OK
0
1
0
1
Configure the parameter under Configure > Parameters > Breakers > Breaker # feedback monitoring > Position failure. The
parameter is only visible if there is an external breaker is on the single-line diagram. This alarm is always enabled. The alarm action
is Warning, Latch enabled.
Table 7.26
Default parameter
Parameter Range Default
Delay 1 s to 1 h 1 s
All controllers in the busbar sections under switchboard control
If the Breaker # feedback position failure alarm is activated for an externally controlled bus tie breaker without redundant breaker
feedback, the controller cannot be sure whether the breaker is open or closed. The power management system therefore puts all the
controllers in the sections on either side of the externally controlled bus tie breaker under switchboard control. The controllers
remain under switchboard control until the position failure is fixed, the alarm is acknowledged, and the latch is reset.
DESIGNER'S HANDBOOK 4189340911K UK Page 273 of 521
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