Functions
2.42 Monitoring Functions
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
284
Note
Voltage sum monitoring is only effective if an external displacement voltage is connected at the displacement
voltage measuring input and this is also notified via the parameter 223 UE CONNECTION to the device.
Voltage sum monitoring can operate properly only if the adaptation factor Uph / Udelta at address 225 has
been correctly configured (see Subsection 2.5.1).
Figure 2-132 Voltage sum monitoring
2.42.1.2 Software Monitoring
Watchdog
For continuous monitoring of the program sequences, a watchdog timer is provided in the hardware (hardware
watchdog) which will reset and completely restart the processor system in the event of processor failure or if a
program falls out of step.
A further software watchdog ensures that any error in the processing of the programs will be recognized. This
also initiates a restart of the processor system.
If such a malfunction is not cleared by the restart, an additional restart attempt is begun. After three unsuccess-
ful restarts within a 30 second window of time, the device automatically removes itself from service and the red
"Error" LED lights up. The operational readiness relay ("Life contact") opens and issues an alarm (alternatively
as NO or NC contact).
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