Interface for Power Rail
• Used for redundant configuration
• Supply rating 4 A, external fused
• Relay contact output, reversible
• LED status indication
Function
The power feed module interfaces 24 V DC power to the
Power Rail at a maximum current of 4 A and is designed for
applications requiring redundant power. The twin input
terminals allow for daisy-chaining of supply (max. 10 A).
A green LED on the front of the unit indicates that power is on,
and a red LED illuminates during error conditions.
In the event of a field wiring or barrier fault from any barrier on
the Power Rail, the integral collective error messaging relay
alerts the controller via a single digital I/O point. This relay
can be configured as normally open or normally closed.
Additionally, the bus implemented in the Power Rail is
forwarded to the outside terminals 13 and 15 for usage with
KFD2-WAC2-Ex1.D RS 485 connection. Terminal 14 is only
for test purposes.
In the sense of functional safety (SIL) the device provides no
dangerous failures. Thereby the safe condition of the supplied
barrier must be defined as the powerless state. Thus the
device will not influence the safety calculation or the SIL
value.
This device is compatible with all versions of the Power Rail
and provides group fusing.
Note: Redundant systems require two KFD2-EB.R4A.B

modules.