Grounding - Mitsubishi Electric MELSEC iQ-F Series User Manual

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
Other device
controller
Independent grounding (best)
Programmable controller extension devices (excluding expansion boards and communication adapters)
Programmable controller
Expansion Expansion
adapter board
• 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
Other device
controller
Shared grounding (acceptable) Common grounding (not allowed)
Extension
CPU module
module
Independent grounding Class-D grounding
(grounding resistance: 100 or less)
Programmable
Other device
controller
Intelligent
Other device
module
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13.3 Grounding