[ Vfdmod ] An easy VFD control over MODBUS RTU

Vfdmod doesn't appear to support 04 functions. But yes, according to the manual you would be able to use 04 to read the registers.

Had some time lately to play with the CNC. I cant get my  DZB200 to go into rev. I tried the negative command value by compiling the program and it works but still in the forward direction. The rev light goes on then back to forward . Its been good to use my old C skills but I haven't solved anything.  Well I don’t need rev but I would be nice the have it working for someone else.Debug txt  below If any one wishes to look,Thankssrl 

Thanks Rob.   I am pretty close with my H100 VFD.    I have everything set "correctly" as far as I am able to tell, but I have one issue.  I cannot get the RPM above 4000.   I don't have a tach, but the spindle seems to be turning at the 4000 rpm indicated.   Spindle turns on and off, and I can slow it down, but I cannot go faster.    (It works fine in manual mode).

Screen shot and config attached.

 

I would look at the vfd itself. Look at F014-F021 - mine are all set to 5.00. If these are too high it won't get to the target speed. I had this issue and I *think* it was the accel settings that straightened it out.

Mine are all set to 5.00 so it has to be something else.

Register Setting
1 2
2 2
3 400
4 400
5 400
6 10
7 .5
8 110
9 15
10 5
11 20
12 1
13 0
14 10
15 10
16 5
17 5
18 5
19 5
20 5
21 5

It's setting 7 - change this from .5 to 50. I was just testing some different settings and this is the one that made the actual difference.

There are a few other settings we have different. 14 and 15 make a noticeable difference in accel and decel times / speed, others are not really noticed at all.
6 - 15
9 - 40
11 - 50
14 - 5
15 - 5

I changed them all to match yours and still have the issue. Maybe I am not describing it well. When I bring up the Axis gui, and press on the spindle forward icon, it goes to 3996 and will not go any faster. Is this a linuxcnc setting or still something on my VFD?

I do appreciate your help, when I get this working I'll document all my settings and upload it.

The screenshot shows some of the different vfdmod settings / syntax that we have, along with the different rpm in / out / spindle-at-speed values. To get your 3996 rpm out and 401 rpm in, did you click the spindle + button in axis, or do an MDI command? Try to doing M3 S6000 and see what those values say then.

Then the attached file shows all of your spindle related settings, with my spindle related settings below (with the // in front). These are spread over different files but I have pasted all into one so it's easier to see. Your main ini and vfdmod ini files seem to be fine, so I am thinking the problem lies in these vfdmod net settings.

 
 

I was doing a S6000 and F9. When I do a M3 S6000 (or whatever speed) it works!!! I guess I just assumed that F9 did the same as a M3.

Are our net settings different due to different linuxcnc versions? I'm at 2.8 but I could upgrade to 2.9.

I do get an 100 error now and then, should I adjust the baud rate or protocol delay?

vfdmod: setting control word value to 0 (0x0000)...
[0ERROR Connection timed out: select
1][06][02][00][00][00][88][72]
Waiting for a confirmation...
<01><06><02><00><00><00><88><72>

My linuxcnc version is 2.8.4 and is sort of stalled out since I run a parport / rtai combo. The mesa configurations are quite a bit different than what I have, so I would suspect its just that.

As far as errors go, I get a number of errors just as a matter of course. As long as the vfd responds and the spindle does what it's supposed to, I don't worry about it.