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Author Topic: Spindle VFD feedback  (Read 2477 times)

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Spindle VFD feedback
« on: November 12, 2016, 07:13:30 AM »
Hi there!!!

I own a chinese 800w VFD since 2012 and running like new, now I have a new cnc ethernet controller, I am already able to controle the spindle speed and start/stop from Mach3 but I would like to have the rpm feedback from the vfd into the mach3.
As the VFD screen shows the current rpm of the spindle, how can I get that info, which are the pins on the vfd and what time of signal is it? Pwm or analog?


Offline reuelt

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Re: Spindle VFD feedback
« Reply #1 on: July 06, 2017, 04:58:34 AM »
Why? it would be redundant.
Since the spindle is a direct drive (no pulleys in between), RPM should = S Speed already.

You will need a tachometer detector that can generate 1 pulse per rev. This signal is fed into the index pin of mach 3.
There are lasers and hall-effect (magnetic) detectors but spindle is too small to mount anything reflective or magnet for the tachometer circuit.
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Re: Spindle VFD feedback
« Reply #2 on: July 07, 2017, 07:27:50 AM »
As far as I know Mach3 dont use the feedback for adjustment of true spindle rpm. This is the main reason why I are going for Servomotor as Spindle. I newer got my VFD to output correct rpm to spindle by far.
You can read out the true Spindle RPM in Mach3, but Mach3 will not adjust it.
Re: Spindle VFD feedback
« Reply #3 on: July 07, 2017, 09:16:00 AM »
Hello soruud maybe it will help : https://www.youtube.com/watch?v=GFw2V2xDizM