Controlling Device Functions
227
7SS52 V4 Manual
C53000-G1176-C182-3
Blocking the TRIP
command -
busbar-selectively
The busbar-selective blocking of the TRIP command can be done at the central unit
for the connected bay units as well as at the bay units directly via DIGSI, binary input
or local operation
Blocking via the central unit is done with “$03 BlkTrip” (FNo. 177.1337/CU) or
a binary input “>Blk Trip $03” (FNo. 177.1336/CU) and is indicated by the
annunciation "$03 BlkdTrip" (FNo. 177.1338/CU) or "TRIP BZ blkd G" (FNo.
10497/CU). The annunciation "IsoProhib/Maint" (FNo. 10471/CU) is output.
The blocking via the bay unit is done via “>Blk.BB TRIP” (FNo. 7629/BU) or
“BLOCKAGE ON?” (FNo. 4201/BU) is indicated by the annunciation "BB TRIP
block" (FNo. 7657/BU).
The system will always be reset when the blocking is deactivated, e.g. at the bay unit
with “BLOCKAGE OFF?” (FNo. 4202/BU), in order to completely terminate the
processes triggered by tests and checks (e.g. CBF).
In the case of a restart or a power failure the tagging “Blocking BF” is retained. The
tagging is erased in the case of an initial start.
The annunciation "IsoProhib G" (FNo. 10471/CU) is output.
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