Need help with C41 PWM HAL

Well, I've made another attempt at solving this issue...no joy. I have added the pwm frequency, but there is still no effect on the output voltage when I change spindle speeds.. Something critical is being omitted. I'm still trying to make sense out of it all.
-Jon

You could set up hal WATCH and select all the pins that are being used for the spindle. Then apply the signal spindle on and vary the rpm to see that the proper results are taking place in hal and if there is a problem there.

Rick G

Thanks rick,
I was able to determine that I had a bad wire connection. With that resolved, I'm able to get the correct output from the C41 when an M3 is issued. 10v @ 5000 RPM, 5v @ 2500 etc. My only concern is that when I issue an M5, I would expect that the output would drop to 0v, but it only drops to .70v. I'm reluctant to actually connect the spindle control board until I'm sure that everything is correct.
-Jon

rreddy2go wrote: , I would expect that the output would drop to 0v, but it only drops to .70v. I'm reluctant to actually connect the spindle control board until I'm sure that everything is correct.

That is most likely to be hardware rather than software, and it is possible that it will drop all the way to zero when the spindle controller is attached.
Typically you have a separate output to turn the spindle on and off, often a relay. Is that working? If so then you will have a spindle that will stop, but won't do a speed less than 350rpm. Depending on the drive (does it actually make any torque at 350 rpm?) that might be OK.

My only concern is that when I issue an M5, I would expect that the output would drop to 0v, but it only drops to .70v. I'm reluctant to actually connect the spindle control board until I'm sure that everything is correct.

If you are using a relay to activate the spindle on / off, forward / reverse then as long as the relay is working the spindle should stop, VFD's often have different settings to select the logic.

Rick G

Thanks for all of your help with this. It has been a true learning experience. i was able to reduce the minimum speed pot on the spindle board until the spindle stopped when M5 was issued. Everything is working now. Just need to tweak it a bit.
Jon R