At lower end it's about twice the voltage, then the error gets lower as we go up. I also noticed spindle rpm glitching once. I have an encoder and had setup spindle at speed with that, That's how I noticed first. Then measured the voltages.
Did you check the the analog command (xx.n.7i76.0.0.spinout) in hal is as expected?
that is 1000 for a 1000 RPM command with a scale of 10000
(in case you have feedback in the PID setup and there is a encoder issue)
If the analog spindle output (when disconnected from the VFD) is non-linear
relative to xx.n.7i76.0.0.spinout pin, it likely means the the OP-AMP buffer
in the analog output circuit has been damaged, perhaps by EMI from the VFD
Yes. First thing I checked is the HAL. This has been a machine that runs daily. no changes whatsoever.
That is exactly what I measured. Disconnected the analog out from the spindle drive, then measured. It's wildly non-linear. What Can I do? I live far away from US and don't really have a way to get a new one too. Can you provide the op amp model so that I can try to fix it?
Spindle drive did emit a bad EMI. I had to put filters in the power line of the PC. But didn't expect it to affect the analog out. 10V power is fed through a separate isolated 10V supply. spindle drive is a 11KW SZGH drive. This worked untouched from 2021 and did run daily without a hiccup. This was the only issue that I ever came across.
