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Figure 3-13 shows the connections to redundant CI820 FCIs.
This power supply can be utilized for non-redundant and redundant applications and
does not require additional load-sharing control equipment such as diode voting
units.
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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
SELV