On 11/22/24 03:48, Viesturs Lācis wrote:
Viesturs
otrd., 2024. g. 19. nov., plkst. 19:45 — lietotājs Peter Wallace
(<p...@mesanet.com>) rakstīja:
Is there a complete specification of the C signal protocol?
I pasted all the Halscope traces here.
https://drive.google.com/drive/folders/1LU8o4sby2Z89cPpkXSZ2PGD_iqMi0r_b?usp=sharing
I have captured transitions from one pattern to another with 4 data
lines - each of encoder channels + rawcounts value to keep track of
where is it. Please let me know what else can I do.
trešd., 2024. g. 20. nov., plkst. 11:56 — lietotājs Robert Schöftner
(<r...@unfoo.net>) rakstīja:
I would also think there is some issue with ground (broken wire?) or
with configuration (assuming hardware is OK of course) -- I got the
same VFD in my Biesses, and although they seem a bit noisy
(touchscreens nearby doen't work as soon as spindle starts despite
shielded motor cables and proper grounding), vfd and motor work ok.
analog signals are coming from 7i48, connected to pins 4 and 5.
start/stop signals etc... is driven by original wiring and relay break
out boards.
Thank you Gene and others for the tips! I did fix it but am not sure
what was the cause - with wires removed from VFD the analog output was
stable. Connecting cables to VFD and it was fluctuating. In the end it
was stable if I removed the wires from VFD to 7i37 board that provide
"run" and "stop" signals for VFD. I just introduced 2 relays inbetween
and now it kinda works.
Robert I was hoping that your experience might help on this as I am
getting something that I have not seen before - with pwmgen value = 0
there are 0.3V on the actual analog output (that is approximately 1/30
of the full range so should give about 10Hz on VFD output as I have
0-300Hz range specified in Pr0 and Pr1) but the VFD runs the motor at
much higher speed - the frequency matches Prc parameter in VFD.
Increasing analog ooutput voltage gradually increases the speed so
that 10V gets me 300Hz which is expected. If I change Prc parameter
the min frequency also changes but the problem is that setting it to
100 or below does not work properly (although default value is 50
according to manual). Here is a little video:
https://www.youtube.com/watch?v=bOSE56Y3TI8
What is the horsepower of that spindle? It sounds like something is out
of balance by quite a bit. I have 2 vfd's I can play with but not enough
power to spin the Sheldon at more than 250 hz, its plain bronze
bearings, but both will goto their top speed with only the rush of air
for cooling type noise unless I have a bad tool in the 24k at 400 hz
6040 mill.
There are minimum speeds, below which the vfd will shut down, I had to
find that and reduce it on the sheldon so it will run at 5hz. Long
enough to get the job done w/o serious overheat. I have also limited
coil currant to that motors FLA rating so pay attention to that when
setting low speed boost. It will heat, but will generally stay safe.
Tuning a vfd can be ticklish. That one sounds like it is beating the
motors bearings badly.
> It will trigger some errors if I let it keep chocking like that. Any
ideas what is wrong?
And according to manual there should be parameter "Pr d" that would
allow to access additional variables - I wanted to change b50 to
provide "at speed" signal on terminals 1 and 2 and also check the b53
because it does not change the output on A0 and A2 terminals as the
drive stops (it should be "running at minimum speed" signal there)
Viesturs
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Cheers, Gene Heskett, CET.
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