Grounding - Mitsubishi Electric MELSEC-F FX3G Series User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
9.3

Grounding

Ground the PLC as stated below.
• Perform class D grounding. (Grounding resistance: 100 or less)
• Ground the PLC independently if possible.
If it cannot be grounded independently, ground it jointly as shown below.
PLC
Independent grounding
Best condition
Extension devices of PLC (except expansion board and special adapter)
PLC
Special
adapter
• Use ground wires thicker than AWG14 (2 mm
• Position the grounding point as close to the PLC as possible to decrease the length of the ground wire.
132
Other
PLC
equipment
Shared grounding
Good condition
Expansion
Main unit
board
9 Preparation for Wiring and Power Supply Wiring Procedures
Other
PLC
equipment
Common grounding
Not allowed
Input/output Special
extension unit extension
Independent grounding
Class D grounding
(grounding resistance : 100 or less)
2
).
Other
equipment
Other
equipment
9.3 Grounding