Machsupport Forum
Mach Discussion => Mach4 General Discussion => Topic started by: NosmoKing on May 08, 2023, 12:57:25 PM
-
What is the lower PWM range for Mach4 spindle?
-
So many people have questions regarding how PWM works for spindle control in MACH4.
I'll give you a few details.
The PWM signal has a duty cycle, which is a product of the commanded S value vs the overall spindle speed for the SPINDLE RANGE you're in.
Duty cycle is simply the percentage of active time of a signal over a given time period.
So if your max spindle speed is 10k RPM (declared in the spindle tab, CONFIGURE > CONTROL > RIGHT ARROW OVER TO SPINDLE TAB)
Assuming a max speed of 10k, when you command a speed of 5k you'll have a 50% duty cycle on your PWM signal.
If you question is regarding the lower frequency ranges permitted by PWM in general, I'd have to check with someone but I'm pretty sure the limitation is strictly hardware based.
-
Yeah I am familiar with PWM, I am just designing a DC motor drive that I want to make compatible with another application also that uses 20hz PWM control signal.