IAI America PCON-SE - Manual (Page 39)

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3. Installation and W
iring
[2] Precautions regarding wiring method
Use a twisted cable for connection to the 24 VDC external power supply.
Separate the controller cables from high-power lines such as a cable connecting to a power circuit. (Do not
bundle together the controller cables with high-power lines or place them in the same cable duct.)
If you wish to extend the motor wiring or encoder wiring beyond the length of each cable supplied with the
controller, consult IAI’s Engineering Service or Sales Engineering Section.
(2) Noise sources and elimination
Among the numerous noise sources, solenoid valves, magnet switches and relays are of particular concern when
building a system. Noise from these sources can be eliminated by implementing the measures specified below.
AC solenoid valves, magnet switches and relays
Action --- Install a surge absorber in parallel with the coil.
Point
Install a surge absorber to each coil over a minimum wiring length.
Installing a surge absorber to the terminal block or other part will
be less effective because of a longer distance from the coil.
3.3 Noise Elimination and Grounding
This section explains how to eliminate noise in the use of the controller.
(1) Wiring and power supply
[1] As for grounding, provide a dedicated class D grounding (former class 3 grounding). The grounding cable
shall have a size of 2.0 ~ 5.5 mm
2 or larger.
Controller
Other
equipment
Controller
Other
equipment
Use the thickest
possible line and
wire it over the
shortest distance.
Class D grounding
(Former class 3 grounding: Grounding
resistance of 100
Ω or less)
Metal enclosure
Avoid using this method.