Functions
154
7SS52 V4 Manual
C53000-G1176-C182-1
ISOL ST 1/1 The parameter ISOL ST 1/1 (6304/CU) is used to choose the isolator status which
will be assumed if the checkback signal is not plausible (at the same time OPEN and
CLOSED).
With setting OLD the old status will be assumed.
With setting ON the isolator will be assumed to be CLOSED.
ISOL Malfunct The parameter ISOL Malfunct (6302/CU) is used to select the response of the pro-
tection to isolator malfunctions (runtime or plausibility error, auxiliary voltage failure).
With setting alarm only isolator malfunctions will only lead to the output of an alarm.
The protection will not be blocked.
With setting blocking isolator malfunctions will lead to the output of an alarm and to
a blocking of the protection system as set in the parameter BLOCKING MODE (6305/
CU). The blocking is automatically cleared as soon as the isolator malfunction has
been eliminated.
With setting block./acknow. isolator malfunctions will lead to the output of an
alarm and to a blocking of the protection system as set in the parameter BLOCKING
MODE (6305/CU). The blocking will be maintained until the malfunction has been elim-
inated and the blocking has been selectively reset by the operator input ”Reset Iso-
MalBl” or via the binary input ">Reset IsoMalBl" (BI FNo. 7/CU).
With setting block./release isolator malfunctions will lead to the output of an
alarm and to a blocking of the protection system as set in the parameter BLOCKING
MODE (6305/CU). The blocking will be cancelled even if the malfunction persists if it
has been selectively reset by the operator input ”Reset IsoMalBl” or via the binary
input ">Reset IsoMalBl" (BI FNo. 7/CU). In this case a warning "IsoProhib/
fault" (FNo. 10470/CU) will be output.
The entry in the operational event buffer will reflect the actual presence of the isolator
malfunction.
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