Proface AGP3500 - 10.4 DIO HMI" - Manual (Page 9)

9
• Use voltage and noise reducing transformers with capacities exceeding Power Con-
sumption value.
• Connect a surge absorber to handle power surges.
• Be sure to ground the surge absorber (E1) separately from the GP unit (E2).
Select a surge absorber that has a maximum circuit voltage greater than that of the
peak voltage of the power supply.
‹ Grounding Cautions
• Be sure to create an exclusive ground for the Power Cord’s FG terminal. Use a grounding
resistance of 100
Ω, a wire of 2 mm 2
or thicker, or your country’s applicable standard.
• 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 the design of the system/
connection does not produce a shorting loop.
• The grounding wire should have a cross sectional area greater than 2 mm
2
. Create the
connection point as close to the GP unit as possible, and make the wire as short, as possible.
When using a long grounding wire, replace the thin wire with a thicker wire, and place it in a
duct.
‹ Input/Output Signal Line Cautions
• All GP Input and Output signal lines must be separated from all operating circuit (power)
cables.
• If this is not possible, use a shielded cable and ground the shield.
Lightning Surge Absorber
E1 E2
FG
GP
GP unit
Other
Equipment
Exclusive Grounding
(BEST)
GP unit
Other
Equipment
Common Grounding (OK)
GP unit
Other
Equipment
Common Grounding
(Not OK)