Functions
2.10 Monitoring Functions
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
175
Table 2-8 Summary of the device's malfunction responses
1)
After three unsuccessful restart attempts, the device is shut down.
2)
DOK = "Device okay" = readiness relay drops out, protection and control functions are blocked.
Monitoring Possible causes Malfunction re-
sponse
Annunciation (No.) Output
Auxiliary voltage failure External
(auxiliary voltage)
Internal
(converter)
Device shutdown All LEDs dark DOK
2)
drops out
Buffer battery Internal
(buffer battery)
Annunciation „Fail Battery“ (177)
Hardware watchdog Internal
(processor failure)
Device shutdown
1)
"ERROR" LED DOK
2)
drops out
Software watchdog Internal
(processor failure)
Restart attempt
1)
"ERROR" LED DOK
2)
drops out
Working memory ROM Internal (hardware) Abortion of restart,
device shutdown
LED flashes DOK
2)
drops out
Program memory RAM Internal
(hardware)
During boot sequence "ERROR" LED DOK
2)
drops out
During operation:
restart attempt
1)
"ERROR" LED
Parameter memory Internal (hardware) Restart attempt
1)
"ERROR" LED DOK
2)
drops out
Sampling frequency Internal (hardware) Device shutdown "ERROR" LED DOK
2)
drops out
Error in the I/O board Internal (hardware) Device shutdown „I/O-Board error“ (178),
"ERROR" LED
DOK
2)
drops out
Offset monitoring Internal (hardware) Device shutdown „Error Offset“ (191) DOK
2)
drops out
Current sum Internal
(measured value ac-
quisition)
Annunciation „Failure Σ I“ (162) As allocated
Current symmetry External
(system or current
transformer)
Annunciation „Fail I balance“ (163) As allocated
Voltage symmetry External
(system or voltage
transformer)
Annunciation „Fail V balance“ (167) As allocated
Voltage phase sequence External
(system or connec-
tion)
Annunciation „Fail Ph. Seq. V“ 176) As allocated
Current phase sequence External
(system or connec-
tion)
Annunciation „Fail Ph. Seq. I“ (175) As allocated
Fuse failure monitor External
(voltage transformer)
Annunciation „VT FuseFail>10s“
(169)
„VT FuseFail“ (170)
As allocated
Trip circuit supervision External
(trip circuit or control
voltage)
Annunciation „74TC Trip cir.“ (6865) As allocated
Secondary voltage transformer
circuit monitoring
External
(voltage transformer
circuit interruption)
Annunciation "VT brk. wire" (253) As allocated
Capacitive voltage
measurement
Misconfiguration Annunciation „Capac.Par.Fail.“
(10036)
As allocated
Adjustment data error Internal (hardware) Annunciation „Alarm NO calibr“ (193) As allocated
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