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Functions
2.24 Monitoring Functions
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
433
Table 2-17 Summary of Malfunction Responses of the Device
Monitoring Possible Causes Malfunction Re-
sponse
Indication (No.) Output
Loss of aux. voltage External (aux. voltage)
internal (converter) Device out of operation,
alarm if necessary all LEDs dark
„Error 5V“ (144) DOK
2)
drops
out
Measured value
acquisition Internal (converter or refer-
ence voltage) Protection out of opera-
tion, indication LED „ERROR“
„Error A/D-conv.“ (181) DOK
2)
drops
out
Buffer battery Internal (buffer battery) Indication „Fail Battery“ (177) As allocated
Hardware watchdog Internal (processor failure) Device out of operation LED „ERROR“ DOK
2)
drops
out
Software watchdog Internal (program sequence) Restart attempt
1)
LED „ERROR“ DOK
2)
drops
out
Main memory Internal (RAM) Restart attempt
1)
, abort
restart
Device out of operation
LED flashes DOK
2)
drops
out
Program memory Internal (EPROM) Restart attempt
1)
LED „ERROR“ DOK
2)
drops
out
Parameter memory Internal
(flash EPROM or RAM) Restart attempt
1)
LED „ERROR“ DOK
2)
drops
out
Sampling frequency Internal (master clock) Restart attempt
1)
LED „ERROR“ DOK
2)
drops
out
1 A/5 A setting Jumper setting 1/5 A incorrect Indications:
Protection out of opera-
tion
„Error1A/5Awrong“
(192) „Error A/D-conv.“
(181)
LED „ERROR“ DOK
2)
drops
out
Adjustment values Internal (EEPROM or RAM) Indication:
using default values „Alarm adjustm.“ (193) As allocated
Earth current transform-
er sensitive/insensitive I/O module does not comply
with the order number (MLFB)
of the device Indications:
Protection out of opera-
tion „Error neutralCT“
(194)„Error A/D-conv.“
(181)
LED „ERROR“ DOK
2)
drops
out
Modules Module does not comply with
order number (MLFB). Indications:
Protection out of opera-
tion „Error board1...7“ (No
183 ... 189)
and if applicable
„Error A/D-conv.“. (181) DOK
2)
drops
out
Current sum Internal (measured value ac-
quisition) Indication
Total blocking of differ-
ential protection „Failure
Σ
i“ (289) As allocated
Current symmetry External (power system or
current transformer) Indication „Fail I balance“ (163) As allocated
Broken wire External (power system or
current transformer) Indication
Phase-selective block-
ing of differential protec-
tion „Broken Iwire L1“ (290),
„Broken Iwire L2“ (291),
„Broken Iwire L3“ (292) As allocated
Voltage sum Internal (measured value
acquisition) Indication „Fail
Σ
U Ph-E“ (165) As allocated
Voltage symmetry External (power system or
voltage transformer) Indication „Fail U balance“ (167) As allocated
Voltage phase
sequence External (power system or
connection) Indication „Fail Ph. Seq.“ (171) As allocated