Power Supply Wiring; Grounding - Mitsubishi Electric MELSEC FX Series User Manual

FX -4LC User's Manual
3U
5.1

Power Supply Wiring

5.1.1 Power supply wiring

Grounding

(Ground resistance:
100Ω or less)
FX PLC [Main unit]
3U
Power-on/off timing
The 4LC power supply should be turned ON simultaneously with or before the power supply of the PLC main
unit. Before turning the power OFF, ensure the safety of the system and then simultaneously turn the main
unit, 4LC, and other extension equipment (the special extension equipment is included) OFF.
For details, refer to the respective PLC manual.
5.1.2 Grounding
Ground the cables as follows
• The grounding resistance should be 100 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.
4LC
Independent grounding
Best condition
• The grounding point should be close to the 4LC, and all grounding wires should be as short as possible.
28
Stabilized
power supply
Grounding
24V DC
(Ground resistance:
100Ω or less)
24+ 24-
4LC
Other
4LC
equipment
Shared grounding
Good condition
FX
2NC
FX
3UC
FX PLC
3UC
[Main unit]
Grounding
(Ground resistance:
100Ω or less)
→ Refer to the FX
→ Refer to the FX
Other
4LC
equipment
Shared grounding
Not allowed
5.1 Power Supply Wiring
Stabilized
-CNV-IF
power supply
or
24V DC
-1PS-5V (Ground resistance:
24+ 24-
4LC
→ Refer to the FX
Hardware Edition.
3G
→ Refer to the FX
Hardware Edition.
3U
Hardware Edition.
3UC
→ Refer to the FX
Hardware Edition.
3G
→ Refer to the FX
Hardware Edition.
3U
Hardware Edition.
3UC
Other
equipment
5 Wiring
Grounding
100Ω or less)