YOKOGAWA FA-M3V e-RT3 Plus, Hardware Manual

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A3-34
IM 34M06C11-01E
A3.7 External Cable Routing Requirements
It is especially desirable that the requirements given in this section be satisfied in the
routing of the controller’s signal cables, power supply cables and power-motive cables
of the devices.
 Isolating Cables
When routing cables, segregate by at least 20cm cables that may become noise
sources such as power-motive cables and power supply cables from signal cables that
are susceptible to noise, as shown in figures A3.32 and A3.33.
If that is not possible, separate the cables by putting a separator between them as
shown in figure A3.34.
Signal cables
Power lines
20cm
min.
FA030701E.VSD
Signal
cables
20cm
min.
Power
lines
FA030702E.VSD
Figure A3.32 Segregation Using Cable Rack Figure A3.33 Segregation in Parallel Routing
Signal
cables
Power
lines
Sep arator
Class C grounding
(10

max.)
FA030703E.VSD
Figure A3.34 Segregation Using Separator
 Perpendicular Crossing of Cables
If the signal cables cross power-motive cables or power supply cables, lay them
perpendicular to each other. If no shielded cable is used, it is recommended that a steel
plate of at least 1.6mm thick be placed between the two sets of cables at their
intersection as shown by the dotted lines in Figure A3.35.
Signal cables
1.6mm or thicker
Power lines
FA030704E.VSD
Figure A3.35 Perpendicular Crossing of Cable