[Al_The_Man]

Can anyone tell me what mach2 uses for the spindle PWM frequency?
Al

[ger21]

Does this help? From the manual:

3. PWM motor control
As an alternative to Step and Direction control, Mach2 will output a pulse width modulated signal whose duty cycle is the percentage of full speed that you require. You could, for example, convert the duty cycle of the signal to a voltage ( PWM signal on for 0% of time gives 0 volts 50% gives 5 volts and 100% gives 10 volts) and use this to control an induction motor with a variable frequency inverter drive. Alternatively the PWM signal could be used to trigger a triac in a simple DC speed controller. Figures 4.12 and 4.13 show the pulse width at approximately 20% of the cycle and 50% of the cycle.In order for the PWM spindle speed signal to be turned into direct current (actually a direct voltage is generally used as the input to variable speed drives, but you know what we mean) the pulse signal it must transformed. In essence a circuit is used to find the average of the pulse width modulated signal. The circuit can be a simple capacitor and resistor or be much more complex depending (a) on how linear you want
the relationship between the width and the final output voltage and (b) on the speed of response you need to the changing pulse width.

[Al_The_Man]

Thanks for the info gerry, actually I need the repetition frequency, typically this is 25khz.
Al

[ger21]

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