YOKOGAWA FA-M3V e-RT3 Plus, Руководство по оборудованию

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A3-13
IM 34M06C11-01E
A3.3.2 Grounding Lines
When considering the grounding system in your panel enclosure, take into account the
following:
- To increase noise immunity, connect the signal ground (the GND terminal for the
5V output of the power supply module) to the metal chassis of the base module.
This defines the signal ground as the point of reference potential. To stabilize the
reference potential, directly fix the base module onto a grounded metal plate
installed inside the panel enclosure. It is advisable that you use a plated metal
material with excellent conductivity as the metal plate.
- For grounding lines connecting to the FG terminal and LG terminal of the power
supply module, use thick wiring of at least 2mm
2
. Connect to the Protective earth
(Comply with the regulation of each country.) , and route the line through the
shortest path possible.
For compliance to CE Marking, use braided wires for the system configured with
this module for low impedance even at high frequency.
- It is anticipated that a system failure due to stray current or for other reasons may
occur, though this is very rare, if both the base module and other equipment are
directly fixed onto the metal plate inside the panel enclosure. In such situations,
electrically isolate the base module or the other equipment from the metal plate.
When isolating the base module or other equipment from the plate, connect the
grounding lines of the base module and the other equipment separately to their
respective grounding points. Depending on the cause of system failure, such
measures as disconnecting the SHIELD terminal of each I/O module may be
required.
FA030302.VSD
FA-M3
FG
Protective earth (Comply with the regulation of each country.)
Other
devices
Grounding terminal
Metal plate
Panel
LG
Figure A3.10 Grounding System Diagram