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Power Supply Connection - Mitsubishi Electric MELSEC A Series User Manual

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4.3.3 Power Supply Connection

Observe the following precautions for power supply wiring.
(1) Provide separate wiring systems for the PC power, I/O devices, and
operating devices as shown below.
If the wiring is influenced by excessive noise, connect an isolation
transformer.
200 VAC
REMARK
As safety measures, install a switch for use with "online I/O module change"
only to each of the corresponding modules and equipment.
(2) Do not supply 24VDC power from more than one power supply modules in
parallel to one I/O module. If they are connected in parallel, the power
supply modules may fail.
If the 24VDC output capacity is insufficient for one power supply module,
supply 24VDC from the external 24VDC power supply as shown below:
24 VDC
24 VDC
(3) 100VAC, 200VAC, and 24VDC wires should be twisted as tightly as
possible, and connect the modules at the shortest distance between them.
To minimize voltage drop, use thick wires (MAX. 2mm
PC power
Main power supply
supply
I/O power supply
Main circuit devices
24 VDC
External power supply
Isolation
transformer
PC
T1
I/O devices
Main circuit devices
39
2
) where possible.

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