[logikphasenwinkelueberwachung-wlk-040514, 1, en_GB]
Figure 2-58 Logic of the Positive Sequence System Phase Angle Monitoring
Malfunction Reaction
Depending on the kind of fault detected, an alarm is given, the processor is restarted or the device is taken out
of operation. After three unsuccessful restart attempts, the device is taken out of service. The device ready
relay drops out and indicates the device failure with its NC contact (“life contact”). The red LED “ERROR” on the
device front lights up, provided that there is an internal auxiliary voltage, 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 device.
Table 2-5
Summary of Malfunction Responses of the Device
Monitoring possible causes Error response Message (F.No) Device
AC/DC supply voltage
loss
External (aux. voltage)
internal (converter)
Device out of operation
alarm, if possible
All LEDs dark
Error 5V
(144)
DOK
2)
drops out
Measured Value Acquis-
ition
Internal (converter or refer-
ence voltage)
Protection out of opera-
tion, alarm
LED “ERROR”
Error A/D-
conv.
(181)
DOK
2)
drops out
Buffer battery Internal (battery) Indication
Fail Battery
(177)
As allocated
Hardware Watchdog Internal (processor failure) Device not in operation LED “ERROR”
DOK
2)
drops out
Software watchdog Internal (program execu-
tion)
Restart attempt
1)
LED “ERROR”
DOK
2)
drops out
Main memory Internal (battery)
Restart attempt
1)
,
Restart abort
Device not in operation
LED flashes
DOK
2)
drops out
Program memory Internal (EPROM)
Restart attempt
1)
LED “ERROR”
DOK
2)
drops out
Settings memory internal (Flash-EPROM or
RAM)
Restart attempt
1)
LED “ERROR”
DOK
2)
drops out
Sampling frequency Internal (clock generator)
Restart attempt
1)
LED “ERROR”
DOK
2)
drops out
2.7.1.5
Functions
2.7 Monitoring Functions
140 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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