Yaskawa 120 Series I/O Modules - Manual (Page 260)

6.4 Precautions on Wiring
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Although the capacity of surge absorber must be adjusted to the load, the following
surge absorber is recommended for general applications:
• CR50500 (manufactured by Okaya Electric Industries Co., Ltd.) or equivalent
Fig. 6.9 Connecting Inductive Loads
3) Long Wiring Runs from Input Devices
When long wiring is required for connection to external devices or when a large
induced voltage is generated due to a nearby inductive source, a dummy resistor
should be connected in parallel with the AC Input Module to suppress the induced
voltage.
If the dummy resistor is not connected, the input signal may become unstable and
malfunction will occur.
Although the size of dummy resistor must be adjusted to the inductive voltage, the
following surge values are recommended for general applications:
• At 100 VAC: 5k Ω (10W min.)
• At 200VAC: 10k Ω (20W min.)
Fig. 6.10 Long Wiring Runs from Input Devices
100 VAC
(200 VAC)
Surge absorber
Inductive load
Input
Input
Common
100 VAC
(200 VAC)
Long distance
Dummy resistor
Input
Input
Common