Power Supply Wiring; Wiring Precautions - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Power supply wiring

Power connector layout
Power supply wiring
Multiple input
module
(1) (2) (3)
24 V DC
Grounding
(Ground resistance: 100 Ω or less.)
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.
Other
PLC
equipment
Independent grounding
(Best condition)
• Bring the grounding point close to the PLC as much as possible so that the ground cable can be shortened.

Wiring precautions

Wiring precautions are indicated below.
• Use separate cables for the external I/O signals of the AC control circuit and the multiple input module so that they are not
affected by surge or induction on the AC side.
• Do not approach or bundle with the main circuit line, high voltage line, and load line from other than the PLC. Keep it far
from circuits including high frequency such as high voltage line and inverter load main circuit. It becomes susceptible to
noise, surge, and induction.
• Provide a single-point ground for the shield wire and the shielded cable at the PLC side. However, depending on the
external noise situation, it may be better to ground on the external side.
3 FX5-8AD
394
3.6 Wiring
(Green)
(Black)
(Red)
Other
PLC
equipment
Shared grounding
(Good condition)
(1)Red
(2)Black
(3)Green
Other
PLC
equipment
Common grounding
(Not allowed)