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Binary Input
The binary input (BI) on the arc option card (see "Optional Two-
Channel Arc Protection Card" in Chapter 9) can be used to get the
light indication from another relay to build selective arc protection
systems. The BI signal can also be connected to any of the output
relays, BO, indicators etc. offered by the output matrix (see "Output
Matrix" in Chapter 6). BI is a dry input for 48 Vdc signal from
binary outputs of other Allen-Bradley relays or dedicated arc
protection devices by Allen-Bradley.
Binary Output
The binary output (BO) on the arc option card (see "Optional Two-
Channel Arc Protection Card" and "Optional Digital I/O Card" in
Chapter 9) can be used to give the light indication signal or any other
signal or signals to another relay's binary input to build selective arc
protection systems. Selection of the BO connected signal(s) is done
with the output matrix (See Chapter 5). BO is an internally wetted
48 Vdc signal for BI of other Allen-Bradley relays or dedicated arc
protection devices by Allen-Bradley.
Delayed Light Indication Signal
There is a delayed light indication output signal available for building
selective arc protection systems. Any light source combination and a
delay can be configured. The resulting signal is available in the
output matrix to be connected to BO, output relays etc.
Pick Up Scaling
The per unit (pu) values for pick up setting are based on the current
transformer values.
ArcI>:
1 pu = 1xI
ArcI
>:
1 pu = 1xI
01
for input I
ArcI
>:
1 pu = 1xI
02
for input I
Protection Functions
= rated phase current CT value
N
= rated residual current CT value
01N
01
= rated residual current CT value
02N
02
3-75
857-UM001A-EN-P – July 2009
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