C.2 AC Input Modules
Unified Controller nv series type2 light Controller Unit Instruction Manual
117
誘導負荷
L
サージ吸収素子（スナバ回路など）
入力モジュール
Figure C-8 Measure against Serge
(6) For inputting AC input module, use sinusoidal wave in the specified voltage and
frequency.
Waveform distortion or frequency hunting in the fundamental wave of the AC input
voltage may result in incorrect input (e.g. reading ON state as OFF).
Following cases illustrate main causes of incorrect input:
・
Application of rectangular wave power supply output by uninterruptible power
supply (UPS)
・
Waveform distortion due to harmonic, such as inverter
・
Frequency hunting while applying low voltage transformer (CVT)
When applying AC input module, make sure the AC voltage waveform has 5% or
less input waveform distortion ratio.
To read OFF instantaneously in ON state, writing a user program (Application of
OFF delay timer) is effective.
The figure below shows an example of program applying OFF delay timer to AC
input “X0003.”
X0003
R1003
100ms
100ms
Figure C-9 Program timing example
Input module
Inductive load
Surge absorbing element (e.g., snubber circuit)
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