IAI America SCON-C - Manual (Page 42)

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3.3 Noise Elimination Measures and Grounding
The following explains the noise elimination measures that should be taken when using this controller.
(1) Wiring and power connection
[1] Provide dedicated class-D grounding (former class-3 grounding: Grounding resistance 100
 or less) using
a grounding wire with a size of 1.6 mm
2
or larger.
[2] Cautions on wiring method
Separate the controller wiring from high-power lines of motive power circuits, etc. (Do not tie them together
or place in the same cable duct.)
If the supplied motor or encoder cable is to be extended, consult IAI’s Engineering Service Section or Sales
Engineering Section.
(2) Noise sources and elimination
Noise generates from many sources, but the most common sources of noise you should consider when
designing a system are solenoid valves, magnet switches and relays. Noise generation from these components
can be prevented by the method explained below.
[1] AC solenoid valves, magnet switches, relays
Method --- Mount a noise killer in parallel with the coil.
Noise killer
Connect to each coil over the shortest possible wiring distance.
When a surge absorber is installed on the terminal block, etc., its
noise elimination effect will decrease if the distance from the coil
is long.
Controller
Other
equip-
ment
Controller
Other
equip-
ment
Class-D grounding
(Former class-3 grounding:
Grounding resistance 100
 or less)
Attach the
grounding
wire to the
mounting
screw of the
main unit.
Connect a cable of
the largest possible
size over the shortest
possible distance
Grounding terminal Grounding terminal
Ground the grounding wire for each controller:
do not share with or connect to other equipment.