Grounding - Mitsubishi Electric FX5U User Manual

■Tool
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 (0.99")) to obtain the tightening torque
specified above.
<Reference>
Manufacturer
Phoenix Contact GmbH & Co. KG
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 "Common grounding" shown below.
Other
PLC
equipment
Independent grounding
(Best condition)
PLC extension devices (excluding expansion boards and communication adapters)
PLC
Expansion Expansion
adapter
• Use a grounding wire with thickness of AWG 14 (2 mm
• Locate the ground point as close to the PLC as possible to minimize the length of the grounding wire.
6 WIRING
78
6.3 Grounding
Model
SZS 0.42.5
Other
PLC
equipment
Shared grounding
(Good condition)
CPU
board module
Independent grounding
class D grounding (grounding resistance: 100  or less)
Other
PLC
equipment
Common grounding
(Not allowed)
Intelligent
I/O
module module
2
) or thicker.
0.4 mm
(0.01")
Other
equipment
With straight tip
2.5 mm
(0.09")