Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Fred_evans on April 08, 2015, 01:27:51 PM

Title: qestion on pvmbasefreq
Post by: Fred_evans on April 08, 2015, 01:27:51 PM

Hello chaps
in the setup instructions it is recommended in ports and pins that pvmbase frequency be set
to between 5 and 10 for optimum performance.
The installer who installed my OMRON PVM set the base frequency to 500
what effect would this be having on the running of the machine??
regards

fred
 

Title: qestion on pvmbasefreq
Post by: JohnHaine on April 08, 2015, 04:36:10 PM

Do you mean PWM base frequency?  The effective number of speed steps is the kernel clock frequency (eg 25 kHz) divided by the base frequency.  So if you have the kf set to 25 kHz and the base frequency to 500 Hz there will be in effect 50 discrete speed steps.  If the bf was set to 25 Hz which is a common number then there will be 1000 steps, so effectively smoother control.  Whether it makes a significant difference is doubtful.


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