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« on: March 07, 2014, 03:21:25 AM »
The frequency will depend on the commanded feedrate and the steps per unit set.
For example if you had the steps per unit set to 1000 and you commanded a feedrate of 100mm/min then the frequency of that move would be (1000 x 100)/60 =1666.666667 Hz or 1.6KHz
The reason I say that you may have damaged something is that you say it started just as you fired the plasma for the first time. If you have everything connected as it should be then it is unlikely you have damaged hardware but if you have a ground connected wrong or something like that then it is a possibility.
If you have not fried something then I do not know what the issue could be seeing as it was working fine until you fired the plasma.
You could shut Mach down and run the driver test to see what it looks like. Also have a look on the Diagnostics page in Mach and see if the frequency is steady and close to the kernel you have set, also see what the Time in Int is, again on Diagnostics page.
Hood