IAI America RCP2-CF - Manual (Page 36)

16
[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.)
When extending the supplied motor cable or encoder cable, consult IAI’s Technical Support.
(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.
[1] AC solenoid valves, magnet switches and relays
Measure: Install a surge absorber in parallel with the coil.
[2] DC solenoid valves, magnet switches and relays
Measure: Install a diode in parallel with the coil. Determine the diode capacity in accordance with the load
capacity.
In a DC circuit, connecting a diode in reverse polarity will damage the
diode, internal parts of the controller and/or DC power supply, so exercise
due caution.
 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.