Mitsubishi Electric FX3U-1PG - Wiring Precautions; Grounding; Screw Size and Tightening Torque; Terminal Screw Size and Tightening Torque

5 Wiring
5.3 Wiring Precautions
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FX3U-1PG User's Manual
5.3 Wiring Precautions
1) The power supply used for FP, RP, PG0, and CLR should be separate from the power supply used for the
other signals.
2) In an environment with a lot of noise, when malfunctions such as position gap occur, the influence of
noise may be mitigated with the following measures.
• Attach a noise filter (TDK-Lambda Corp. MXB-1210-33 or similar) on the FX
3U-1PG power supply line,
one on the end nearest the servo amplifier, and one on the end nearest the power supply unit.
• Attach a ferrite core (TDK Corp. ZCAT3035-1330 or similar) to the VIN, FP, RP, PG0, and CLR signal
wires, on the end nearest the servo amplifier.
5.4 Grounding
Ground the cables as follows.
• The grounding resistance should be 100 Ω or less.
• Independent grounding should be established whenever possible.
Independent grounding should be performed for best results.
When independent grounding is not configured, perform "shared grounding" as shown in the following
figure.
For details, refer to the respective PLC manual.
→ Refer to FX
3U Hardware Edition.
→ Refer to FX
3UC Hardware Edition.
• The grounding point should be close to the PLC, and all grounding wires should be as short as possible.
5.5 Screw Size and Tightening Torque
5.5.1 Terminal screw size and tightening torque
The terminals on the FX3U-1PG use M3 screws.
Refer to the figures below for cable end treatment.
Set the tightening torque to 0.5 to 0.8 N•m.
Do not tighten terminal screws with a torque outside the above-mentioned range. Failure to do so may cause
equipment failures or malfunctions.
• When one wire is connected to one terminal
• When two wires are connected to one terminal
PLC
Other
equipment
Shared grounding
Good condition
Shared grounding
Not allowed
Independent grounding
Best condition
PLC
Other
equipment
PLC
Other
equipment
TerminalTerminal
Terminal
screw
Crimp
terminal
6.2 mm (0.24")
or less
3.2 (0.13")
6.2 mm (0.24")
or less
3.2 (0.13")
Terminal
screw
Crimp
terminal
Terminal
6.2 mm (0.24")
or less
3.2 (0.13")
6.3 mm (0.25")
or more
6.2 mm (0.24")
or less
3.2 (0.13")
6.3 mm (0.25")
or more