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4. Wiring Cautions

Improving Noise/Surge Resistance

• The GP unit's power supply cord should not be bundled with or kept close

to main circuit lines (high voltage, high current), power lines, or input/

output lines, and their various systems should be kept separate. When

power lines cannot be wired via a separate system, use shielded cables

for input/output lines.

• Make the power cord as short as possible, and be sure to twist the ends of

the wires together (i.e. twisted pair cabling) from close to the power supply

unit.

• If there is an excess amount of noise on the power supply line, connect a

noise reducing transistor before turning on the power.

• Connect a surge absorber to handle power surges. Be sure to ground the

surge absorber (E1) separately from the GP unit (E2).

Short Circuit Prevention

• The SG (signal ground) and FG (frame ground) terminals are connected

internally in the GP unit. When connecting the SG line to another device,

be sure that no shorting loops are formed.

Grounding

• Use an exclusive grounding wire with a grounding resistance of 100Ω or

greater and a wire of 2mm

or thicker, or your country's applicable

standard.

Lightening Surge Absorber

E1 E2

GP unit

Other

Equipment

Exclusive Grounding

(Best)

GP unit

Other

Equipment

GP unit

Other

Equipment

Common Grounding

(OK)

Common Grounding

(Not OK)

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Pro-face PFXGM4201TAD Guida di Installazione Pagina 14