Functions
2.14 Monitoring Functions
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
174
Figure 2-72 Impact of the measuring voltage failure
2.14.1.4 Fault Responses
Depending on the type of fault detected, an alarm is output, the processor system is restarted or the device is
taken out of operation. After three unsuccessful restart attempts, the device is also shut down. The device
ready relay drops out and indicates the device failure with its NC contact („life status contact“). The red
„ERROR“ LED on the device front lights up, provided that there is an internal auxiliary voltage, and the green
„RUN“ LED goes off. If the internal auxiliary voltage supply fails, all LEDs are dark. Table 2-4 shows a summary
of the monitoring functions and the fault responses of the device.
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