Function Application
‑507‑
Setting an AI as the main frequency source
The control board provides three AI terminals: AI1 to AI3. AI1 provides voltage input of
–10 V to +10 V. AI2 and AI3 provide voltage input of –10 V to +10 V or current input of 0
mA to 20 mA. Jumpers J7 and J5 on the control board can be used to switch between
voltage input and current input for AI2 and AI3, respectively. For details, see chapter 3
Installation and Wiring. The following describes how to set each AI as the main
frequency source.
For example, assume that curve 1 is selected for AI1 (the ones position of F4‑33 is set
to 1), AI1 voltage input is selected as the main frequency source, and the input
voltage range of 2 V to 10 V must correspond to frequency range of 10 Hz to 40 Hz. In
this case, set the parameters according to the following figure.
Figure 3‑15 Parameter settings for AI1 voltage input as the main frequency source
AI2 can provide analog voltage input (–10 V to 10 V) or analog current input (0 mA to
20 mA).
When AI2 provides analog current input of 0 mA to 20 mA, the corresponding input
voltage ranges from 0V to 10 V. If the input current ranges from 4 mA to 20 mA,
current of 4 mA corresponds to voltage of 2 V, and current of 20 mA corresponds to
voltage of 10 V.
For example, assume that curve 2 is selected for AI2 (the tens position of F4‑33 is set
to 2), AI2 current input is selected as the main frequency source, and the input current
range of 4 mA to 20 mA must correspond to frequency range of 0 Hz to 50 Hz. In this
case, set the parameters according to the following figure.
Figure 3‑16 Parameter settings for AI2 current input as the main frequency source
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