IAI America E-Con - Manual (Page 21)

7
(3) Noise Source and Noise Suppression
When using electrical components such as electromagnets, solenoid valve, magnet switch or relays which
create electromagnetic noise, some type of noise suppression device should be used.
1. AC solenoid valve · magnetic switch · relay
Measure: 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.
2. DC solenoid valve · magnetic switch · relay
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.
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