IAI America REXT - Manual (Page 267)

Part 2 Startup Chapter
Chapter 2 Mounting and Installation
243
Part 2 Startup Chapter
a. AC solenoid valves, magnet switches and relays
Measure --- Install a surge killer in parallel with the coils.
b. DC solenoid valves, magnet switches and relays
Measure --- Install a diode in parallel with the coils. Determine an appropriate diode capacity according to the load capacity.
In a DC system, connecting the diode in reverse polarities may damage the
diode, internal controller parts and DC power supply. Exercise due caution.
Surge killer
Keep the wiring length from each coil to a minimum.
If the surge killer is installed on a terminal block, etc., an
extra distance from the coils will reduce the noise
elimination effect.
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