Mitsubishi Electric MELSEC iQ-F FX5UC Series, User Manual

Page: 173 / 282

13 WIRING
13.3 Grounding
171
13
13.3
Grounding
Perform the following.
• Perform class D grounding (grounding 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 controller extension devices (excluding expansion boards and communication adapters)
• Use a grounding wire with thickness of AWG 14 (2

) or thicker. For the FX5UC CPU module, use the accessory ground
wire.
• Bring the grounding point close to the programmable controller as much as possible so that the ground cable can be
shortened.
Programmable
controller
Other device
Programmable
controller
Other device
Programmable
controller
Other device
Independent grounding (best) Shared grounding (acceptable) Common grounding (not allowed)
Programmable controller
Intelligent
module Expansion
adapter Expansion
board
CPU module
Extension
module
Other device
Independent grounding Class-D grounding
(grounding resistance: 100

or less)