Mitsubishi Electric MELSEC iQ-F FX5U - Grounding

6 WIRING
6.3 Grounding
95
6
■Tool
<Reference>
6.3 Grounding
Perform the following.
• Perform class D grounding (Grounding resistance: 100  or less).
• Ground the PLC independently when possible.
• If the PLC cannot be grounded independently, perform the "Shared grounding" shown below.
PLC extension devices (excluding expansion boards and communication adapters)
• Use a grounding wire with thickness of AWG 14 (2 mm
2
) or thicker.
• Bring the grounding point close to the PLC as much as possible so that the ground cable can be shortened.
For tightening terminals, use a small, commercially-available screwdriver with a straight tip. The recommended
shape is shown in the figure on the right.
■Precautions
When a precision screwdriver with a small grip is used, the specified tightening torque cannot be obtained. Use
the following screwdriver or equivalent product (grip diameter: 25 mm) to obtain the tightening torque specified
above.
Manufacturer Model
Phoenix Contact GmbH & Co. KG SZS 0.42.5
0.4 mm 2.5 mm
With straight tip
PLC PLC PLC
Other
equipment
Other
equipment
Other
equipment
Independent grounding
(Best condition)
Shared grounding
(Good condition)
Common grounding
(Not allowed)
PLC
Intelligent
module
Independent grounding
class D grounding (grounding resistance: 100  or less)
Expansion
adapter
Expansion
board
CPU
module
Extension
module
Other
equipment