28 D50 PLC User's Manual
Power Supply Wiring
Power wiring
• When connecting the power cable:
To reduce power loss in the wiring, use at least 14 AWG (2 mm) cable.
To reduce the effect of noise, use twisted, shielded cable.
• An isolation transformer can be used to further reduce noise and to prevent failures from
power problems such as ground faults.
Grounding
• In normal low-noise environments such as closed-room control cabinets, it is possible to
operate the PLC without frame grounding. However, it is necessary to ground the PLC for
noisy environments, and is recommended for all installations regardless of electronic noise
levels.
• For the frame ground, use a cable of at least 14 AWG (2 mm) in size. The ground should be
exclusive to the PLC. Sharing the ground connection with other devices can cause problems
due to ground loops and current feedback.
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