ABB S800 I/O User Manual page 95

Figure 3-13
SD811/812
+24V
PowOK
SD811/812
+24V
PowOK
Avtˆ…r " " 8‚rp‡v‚Ã9vht…h€†Ãs‚…ÃSrqˆqh‡ÃQ‚r…ÃTˆƒƒyvr†Ã‡‚ÃSrqˆqh‡ÃA8D†
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.
3BSE 020 923R101
Trp‡v‚Ã" ! T9'
shows the connections to redundant CI820 FCIs.
CI820
Circuit
Breaker
0V
0V
SD811/812
+24V
0V
PowOK
SD811/812
+24V
0V
PowOK
Brr…hyÃDs‚…€h‡v‚ÃhqÃD†‡hyyh‡v‚ÃV†r…¶†ÃBˆvqr
ÃhqÃT9' !ÃQ‚r…ÃTˆƒƒy’Ã8‚svtˆ…h‡v‚†
TB815 CI820
CI820
Diode
Voting
Unit
Fuse
or MCB
SELV
Optional
Power to
field circuits
via MTUs
85