Siemens SIPROTEC 7SS523 V3.2 Manual page 162

Functions
Isolator status indication
CLOSED OPEN
1 0
0 1
1 1
0 0
Reset of
isolator alarms
146
Tabelle 5-2 Isolator status indications
Meaning
Isolator CLOSED
Isolator OPEN
Isolator status not
plausible
Isolator malfunction:
− runtime
− wire break
− no auxiliary voltage
*) The values such as "CLOSED" and "OPEN" of the alarm (FNo. 176.1110/CU) are
variable.
Depending on the isolator, the alarm is generated via FNo. 176.1110/CU,
176.1115/CU, 176.1120/CU, 176.1125/CU or 176.1130/CU.
Isolators malfunctions (plausibility or runtime errors) and failure of the auxiliary voltage
supply for the isolator checkback signals are not annunciated until the set isolator run-
ning time ISOL TIME (6301/CU) has elapsed.
While a bay is in maintenance, there is no monitoring of the isolator status checkback
signals, nor a plausibility check.
Depending on the setting of the parameter ISOL Malfunct (6302/CU), several
types of behaviour of the blocking are possible, see Figure 5-37, page 147.
The function is reset with the control "Reset IsoMalBl" or by the binary input
">Reset IsoMalBl" (BI FNo. 7/CU) in the central unit.
Reaction
Isolator CLOSED
Isolator OPEN
new isolator status accord-
ing to setting 6304/CU
new isolator status
CLOSED
new isolator status accord-
ing to setting 6303/CU
(see "Auxiliary voltage
supply failure" , page 145)
Alarm
Alarm "CLOSED" (FNo.
176.1110/CU) *)
Alarm "OPEN" (FNo
176.1110/CU) *)
Alarm "Isol flt alarm"
(FNo. 10425/CU),
"FltP $01 $02"
(FNo. 176.1113/CU) and
"Isol fit pos M"
(FNo. 10428/CU)
Alarm "Isol fit run M"
(FNo. 10427/CU)
"Bay DC fail M"
(FNo. 10426/CU) and
"BayDC fail $00"
(FNo. 176.1134/CU)
7SS52 V4 Manual
C53000-G1176-C182-1