To calculate RPM use this formula, in which you will have to find RPM's when you have Hz.
1 RPM = 0.01666666667 Hz
Formula: 0.01666666667 × RPM = Hz
On our VFD if you select the >> button about 3-4 times, it will change from Hz, A, or ROTT.
When the LED's are lit on Power, FOR, and ROTT, you should be able to see the RPM the spindle is running at, our maximum setting for these spindles is 400Hz / 24000 RPM.
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press the shift key on the key pad and the led at the top of the display will move to the right until the Rot (RPM) led is lit the display will now show RMP
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How to I get the VFD to display rotation speed in RPM?