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The diagram shows the connections needed for redundant power supplies to
redundant FCI’s with power supply hot swap possibilities.
Circuit breakers or a diode voting unit at the power supplies output are required if
hot replacement of supplies is required.
L+ L- SA SB
+24V
0V
PowOK
SD811/812
CI820
+24V
0V
PowOK
SD811/812
L+ L- SA SB
L+ L- SA SB
+24V
0V
PowOK
SD811/812
Fuse
or MCB
Optional
Power to
field circuits
via MTUs
CI820 CI820TB815
+24V
0V
PowOK
SD811/812
Circuit
Breaker
Diode
Voting
Unit