Servo Tuning FF

LAIR82 wrote:

After reading these posts about servo tuning, I feel pretty good about tuning both servos on my turning center, but before I try that I want to make sure that I am at least close on my values in my "ini" file for my axis, before i throw power to the servos and have a major crash.

What I would do is set P to a low value, and ID and FFx all to zero, as you have done.
You will almost certainly have to increase MIN_FERROR, maybe to 0.1, assuming
inch units. make sure the encoder/resolver picks up the movement correctly
before enabling the servo. Then, attempt to jog. If it jumps and gets a following error,
you can reverse the motor leads, or the polarity of OUTPUT_SCALE. You may have
to increase P to get it to move at all, it depends on the system. Then you have to
get into tuning with Halscope and the calibration menu.

Jon

Everthing looks good now in regards to the readout/actual values on the display, we had it reading backwards and we were off about 0.100" per inch of travel on the display. I have encountered another problem though, I am not getting any command voltage out of my 7I49 pwmgen output. The enable is working properly on all 6 circuits on the card, and I am getting the proper command out of pwmgen.00 but nothing out of 01-05. I have the spindle on 00, Z on 02, and the X on 04. We did it this way because when we had X on 01 next the spindle we were getting noise between the two on the display.

I have read the thread "Mesa 7i49 Board configuration" from 4 months ago twice to try to remedy but cannot get this figured out. His situation is pretty identical to mine. I have gone through my hal file over and over again with a fine tooth comb and cannot find anything. Talking with my boss he was wondering if maybe the firmware is the problem.\

Thanks

Rick

I posted my hal and ini.


Thanks

Rick

Heres my ini

I can see the value going up and down on the +/- 10v on the pwmgen.02.value pin in the "show hal config" watch screen.

Im not sure what you mean though by thread periods?


Rick

Right now I actually have my meter hooked to the aout2 and gnd2 terminals on the 7I49 with my meter hanging next my screen and keyboard, so I can see exactly whats going on.