ABB S800 I/O User Manual page 119

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The diagram shows the connections needed for redundant power supplies to
redundant FCI's with power supply hot swap possibilities.
SD811/812
SD811/812
Circuit breakers or a diode voting unit at the power supplies output are required if
hot replacement of supplies is required.
3BSE 020 923R101
Trp‡v‚Ã6
CI820
Circuit
Breaker
+24V
0V
PowOK
+24V
0V
PowOK
SD811/812
+24V
0V
PowOK
SD811/812
+24V
0V
PowOK
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TB815 CI820
CI820
Diode
Voting
Unit
Fuse
or MCB
Optional
Power to
field circuits
via MTUs
109