ABB REC 561 User Manual page 300

ABB Network Partner AB
Version 1.0-00
Apparatus control
Selection relay supervision
The normal use of the command output module does not require any
external relays. The supervision of the command relays on the output
module is performed on the circuit board. The output module is normally
connected directly to the switchyard without any extra relays.
To meet requirements of supervision of external selection relays, it is pos-
sible to connect these relays and supervise them by BAYCON in two
ways:
• With common feedback signals from the selection relays (BAY-
CONC and BAYCOND) shown in Fig. 6
• With individual feedback signals (BAYCONE and BAYCONF)
shown in Fig. 7
In the version in Fig. 6, the auxiliary contacts of the relays are wired to
two inputs SEL_CH1 and SEL_CH2. A series connection of NC contacts
connected to SEL_CH1 indicates that no relay is energized. A parallel
connection of NO contacts connected to SEL_CH2 indicates that a relay
is energized. BAYCON can now determine two types of errors. It can
indicate that there is an error most probably at the system inputs with the
BINPERR. BOUTERR indicates that the error is more likely to be found
at the system outputs. When an error occurs, BAYCON cancels all opera-
tions. It lets the reservation go into a fail state, which causes resetting of
the selection or acknowledgement.
In the other version in Fig. 7, BAYCON also checks every relay sepa-
rately. It can then also determine if the wrong relay is energized. It indi-
cates this with the BRLYERR output. When BAYCON has a valid
reservation for a selection request and no error occurs, the selection relay
supervision also sets an output to the requesting apparatus. This is a feed-
back selection (FDB_SELx), which indicates that the energizing of the
relay was correct. Now other software parts can give a close or open com-
mand.
1MRK 580 150-XEN
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