CNC router from industial scrap

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25 Jul 2021 10:42 #215846 by tommylight
How is the VFD controled?
I have used several of water cooled and air cooled 2.2KW spindles controled by analogue voltage from Mesa 7i76E, never had issues with speed.
Had issues with water cooled ones leaking, though.

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25 Jul 2021 11:45 #215849 by Mr. Mass
The VFD is controlled as standard analog 0-10V, connected with shielded wires, shield grounding on the drive side. I tried different grounding options, added ferrite rings, changed different wires, I thought it was some kind of noise problem, but no luck at all.

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25 Jul 2021 14:20 #215857 by PCW
Replied by PCW on topic CNC router from industial scrap
If the VFD has a large capacitor on the analog voltage input, it could
possibly cause instability and high frequency oscillation on the analog output,
so one thing to try is adding a small resistor in series with the 7I76E SPINOUT pin
(say 220 Ohm or so)

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26 Jul 2021 06:40 #215931 by Mr. Mass
Trying with 120, 180 and 330 Ohm resistor, nothing change.

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