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System Setup and Setpoints – 4
4–71
50BF #1 SOURCE 1 BREAKER
FAILURE
Path:
System/Setup/Setpoints/50BF#1
The
50BF #1 Source 1 Breaker Failure
selection
from the Function Settings group (Figure 4-33) opens
the
50BF #1 Source 1 Breaker Failure
dialog screen
(Figure 4-73).
Enable/Disable
— The top right corner of the display
includes a command button that will disable or
enable the function.
Pickup Current
—
A breaker failure condition is
detected by the continued presence of current after
a trip command has been sent to the Source 1
breaker. If the current is greater than the Pickup
Current setting for the time period of the Time Delay
setting after the trip command is sent, then the
breaker failure alarm indicated.
If the Simultaneous Transfer mode is selected
(Common Function Settings Figure 4-33), then the
breaker that was just closed is tripped open to
prevent the New Source from continuing to be
connected through the failed breaker to the Old
Source that could have a fault.
If the Sequential Transfer mode is selected
(Common Function Settings Figure 4-33), then a
close command will not be sent since the breaker
status would indicate that the tripped breaker did
not open. Since the transfer could not be completed
the Incomplete Transfer Lockout timer would time
out and generate a lockout condition.
Time Delay
— The time period (1 to 30 cycles)
after the Pickup Current setting is exceeded at
which point the Breaker Failure Alarm is actuated.
I/O Selection
— The I/O Selection
button opens the
50BF #1 Source 1 Breaker Failure Outputs/Blocking
Inputs Selection Dialog Screen (Figure 4-74).
This
screen allows any input or the Fuse Loss (FL) function
to be selected to block the 50BF #1 Function. The
50BF #1 Function can also be used to activate a
selected output when it times out.
I/O Initiate
— The I/O Initiate
button opens the
50BF #1 Source 1 Breaker Failure Initiate Inputs/
Initiate Outputs Selection Dialog Screen (Figure
4-75).
This screen allows the selection of an input
or inputs that can be used to initiate a breaker
failure. Any of the outputs can also be selected to
initiate a breaker failure.
Save/Cancel
— The Save selection saves the
50BF #1 Source 1 Breaker Failure
settings either to
an open file or to the target MBTS. Cancel, returns
the user to the previous open screen.
Figure 4-73 50BF #1 Source 1 Breaker Failure Dialog Screen
Содержание M-4272
Страница 1: ...Instruction Book Book 1 of 2 M 4272 Motor Bus Transfer System ...
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Страница 198: ...System Setup and Setpoints 4 4 87 Figure 4 92 TCM Trip Circuit Monitor Inputs Outputs Selection Dialog Screen ...
Страница 200: ...System Setup and Setpoints 4 4 89 Figure 4 93 ISSLogic Function Dialog Screen ...
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Страница 214: ...Declaration of Conformity Appendix I I 1 IAppendix I Declaration of Conformity ...
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