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A Appendix
A.9.7
Pre–Defined CFC Charts
Device and System
Logic
Set points
IN: Set points IL< LV
IN: Measurement IL1S2 = MV
IN: Set points IL< LV
IN: Measurement IL2S2 = MV
IN: Set points IL< LV
IN: Measurement IL3S2 = MV
FigureA-49 Undercurrent Monitoring
516
Some CFC Charts are already supplied with the SIPROTEC
The single-point indication ">DataStop" that can be injected by binary inputs is con-
verted by means of a NEGATOR block into an indication "
essed internally (internal single point indication, IntSP), and assigned to an output.
This would not be possible directly, i.e. without the additional block.
IN: Device,
General >DataStop SP
Figure A-48 Logical Link between Input and Output
Using modules on the running sequence "measured value processing", a low current
monitor for the three phase currents is implemented. The output message is set high
as soon as one of the three phase currents falls below the set threshold:
®
device:
UnlockDT
" that can be proc-
OUT:Device, UnlockDT IntSP
OUT: Set points SP. IL< OUT
7UM62 Manual
C53000-G1176-C149-3
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