Settings; Information List; Malfunction Responses Of The Monitoring Functions; Description - Siemens SIPROTEC 7SK80 Manual

Functions
2.10 Monitoring Functions
Supervision with One Binary Input
Note: When using only one binary input (BI) for the trip circuit monitor, malfunctions, such as interruption of the
trip circuit or loss of battery voltage are detected in general, but trip circuit failures while a trip command is active
cannot be detected. Therefore, the measurement must take place over a period of time that bridges the longest
possible duration of a closed trip contact. This is ensured by the fixed number of measurement repetitions and
the time between the state checks.
When using only one binary input, a resistor R is inserted into the circuit on the system side, instead of the
missing second binary input. Through appropriate sizing of the resistor and depending on the system condi-
tions, a lower control voltage is mostly sufficient.
Information for dimensioning resistor R is given in the Chapter "Installation and Commissioning" under Config-
uration Notes in the Section "Trip Circuit Supervision".

2.10.2.3 Settings

Addr. Parameter
8201 FCT 74TC
8202 Alarm Delay

2.10.2.4 Information List

No. Information
6851 >BLOCK 74TC
6852 >74TC trip rel.
6853 >74TC brk rel.
6861 74TC OFF
6862 74TC BLOCKED
6863 74TC ACTIVE
6864 74TC ProgFail
6865 74TC Trip cir.
2.10.3

Malfunction Responses of the Monitoring Functions

The malfunction responses of monitoring equipment are summarized in the following.

2.10.3.1 Description

Malfunction Responses
Depending on the type of malfunction discovered, an annunciation is sent, a restart of the processor system is
initiated, or the device is shut down. After three unsuccessful restart attempts, the device is also shut down.
The readiness relay opens and indicates with its NC contact that the device is malfunctioning. Moreover, the
red "ERROR" LED lights up on the front cover and the green "RUN" LED goes out. If the internal auxiliary
voltage also fails, all LEDs are dark. Table 2-8 shows a summary of the monitoring functions and the malfunc-
tion responses of the device.
174
Setting Options
ON
OFF
1 .. 30 sec
Type of In-
formation
SP >BLOCK 74TC
SP >74TC Trip circuit superv.: trip relay
SP >74TC Trip circuit superv.: bkr relay
OUT 74TC Trip circuit supervision OFF
OUT 74TC Trip circuit supervision is BLOCKED
OUT 74TC Trip circuit supervision is ACTIVE
OUT 74TC blocked. Bin. input is not set
OUT 74TC Failure Trip Circuit
Default Setting
ON 74TC TRIP Circuit Supervision
2 sec Delay Time for alarm
Comments
E50417-G1140-C344-A4, Release date 08.2010
Comments
SIPROTEC, 7SK80, Manual