Chapter 6 Wiring; Power Supply Wiring; Grounding - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

6
WIRING
This chapter describes the wiring methods, wiring products, and wiring precautions when the master/intelligent device module
is used.
6.1

Power Supply Wiring

Power connector array
Power supply wiring
Master/intelligent
device module
(1) (2) (3)
24 V DC
Class D grounding
(grounding resistance: 100 Ω or less)

Grounding

Perform the following.
• Perform class D grounding. (Ground resistance: 100  or less)
• Ground the programmable controller independently when possible.
• If the programmable controller cannot be grounded independently, perform the "Shared grounding" shown below.
Programmable Other
equipment
controller
Independent grounding
(Best condition)
• Bring the grounding point close to the PLC as much as possible so that the ground cable can be shortened.
6 WIRING
52
6.1 Power Supply Wiring
(Green)
(Black)
(Red)
Programmable Other
equipment
controller
Shared grounding
(Good condition)
(1) Red
(2) Black
(3) Green
Programmable Other
equipment
controller
Common grounding
(Not allowed)