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vfd speed control using dac

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raman00084

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i have a vfd drive that accepts 0-10v analog voltage for speed control

i am having a dac connected to pic micro it outputs 0-3.3v analog signal using op amp i am converting to 10v signal
my doubt is can i add a series 1k resistor between the op amp output and vfd input will there be any issue. how much current that the vfd analog input consume? i am adding the 1k resistor for safety if any short in the analog the op amp will not blow.



regards
kalyan
 

Nobody can answer that question without knowing more about the VFD input. There will undoubtedly be some voltage drop but it may be insignificant. Find out the VFD input resistance and treat it like the lower resistor in a potential divider with the 1K as the upper resistor.

Brian.
 

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