Pre-Defined Cfc Charts - Siemens siprotec SJ62 User Manual

A Appendix
A.5.6

Pre-defined CFC Charts

Device and System
Logic
Figure A-96 Logical links between input and output
Setpoints MV
Figure A-97 Undercurrent monitoring
637
Some CFC Charts are already supplied with the SIPROTEC device. Depending on the
variant the following charts may be implemented:
The NEGATOR block assigns the input signal „DataStop" directly to an output. This is
not directly possible without the interconnection of this block.
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:
Blocks of the task level "MW_BEARB" (measured value processing) are used to im-
plement the overcurrent monitoring and the power monitoring.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015