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Where to get an LCD tachometer?

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BillTodd:
Some VFDs  can measure pulses on a spare input and display the result in RPM.

I have a variable reluctance sensor on the spindle of my mill with a simple op-amp to generate square pulses. The pulses feed one of the ABB VFDs inputs. It requires a half dozen settings to get it to display spindle RPM

Bill

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