Mitsubishi MELSEC iQ-F, User Manual

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6 WIRING
6.3 Power Supply Wiring
6.3
Power Supply Wiring
Power connector layout
Power supply wiring
Grounding
Perform the following.
• Perform class D grounding (Grounding resistance: 100
Ω or less).
• Ground the programmable controller independently when possible.
• If the programmable controller cannot be grounded independently, perform the "Shared grounding" shown below.
• Bring the grounding point close to the PLC as much as possible so that the ground cable can be shortened.
6.4
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.
(1)Red
(2)Black
(3)Green
(Green)
(Black)
(Red)
Grounding
(Ground resistance: 100
Ω
or less.)
24 V DC
(1) (2) (3)
Multiple input
module
PLC PLC PLC
Other
equipment
Other
equipment
Other
equipment
Shared grounding
(Good condition)
Common grounding
(Not allowed)
Independent grounding
(Best condition)