Malfunction Reaction - Siemens Siprotec 7VK61 Manual

Figure 2-52

2.7.1.5 Malfunction Reaction

Depending which kind of self supervision function is picked up, an alarm is given, the processor is restarted or
the device is taken out of operation. If the fault is still present after three restart attempts, the device will take
itself out of service and indicate this condition by dropout of the "Device OK" relay, thus indicating device failure.
The red LED „ERROR" on the device front lights up, provided the auxiliary voltage is available, and the green
LED „RUN" goes off. If the internal auxiliary voltage supply fails, all LEDs are dark. Table 2-5 shows a summary
of the monitoring functions and the malfunction responses of the relay.
Table 2-5
Monitoring
AC/DC supply voltage
loss
Measured Value Acqui-
sition
Buffer battery Internal (battery)
Hardware Watchdog
Software watchdog
Main memory Internal (battery)
Program memory
Settings memory
Sampling frequency
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Logic of the Positive Sequence System Phase Angle Monitoring
Summary of Malfunction Responses of the Device
possible causes
External (aux. voltage) inter-
nal (converter)
Internal (converter or refer-
ence voltage)
Internal (processor failure)
Internal (program execution) Restart attempt
Internal (EPROM)
internal (Flash-EPROM or
RAM)
Internal (clock generator)
Malfunction Re-
sponse
Device out of operation All LEDs dark
alarm, if possible „Error 5V" (144)
Protection out of opera- LED „ERROR"
tion, alarm „Error A/D-conv."
(181)
Message „Fail Battery" (177)
Device not in operation LED „ERROR"
1)
LED „ERROR"
1)
Restart attempt , LED flashes
Restart abort
Device not in operation
1)
Restart attempt LED „ERROR"
1)
Restart attempt LED „ERROR"
1)
Restart attempt LED „ERROR"
2.7 Monitoring Function
Message (F.No) Device
2)
DOK
2)
DOK
As allocated
2)
DOK
2)
DOK
2)
DOK
2)
DOK
2)
DOK
2)
DOK
Functions
drops out
drops out
drops out
drops out
drops out
drops out
drops out
drops out
141