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Author Topic: Mach and PWM VFD setup help please  (Read 4192 times)

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Mach and PWM VFD setup help please
« on: May 02, 2012, 04:20:07 PM »
Hi all,

I'm having trouble setting up Mach3 using PWM control with my C32 bob http://www.cnc4pc.com/Store/osc/product_info.php?cPath=33&products_id=255&osCsid=1a46c7c2fc334382a725d2b892800e57

I've followed the C32 Manual instructions on the setting up and in "Motor Outputs" I've inputted Step Pin14 and Dir Pin8 and Both Step port and Dir Port are 1....in spindle setup I have checked the box "Use Spindle Motor Output" and "PWM Control".... "PWM Base Frequency" and all as per manual.........I also use the USB Smooth Stepper so in the Plug-In window I have checked the PWM........I connected the Optoisolated 12VDC to X1 on the C32 and when I either inputted M3 or M5 in MDI I was able to output to the X2 connection terminals 10V analogue or stop the output volts respectively according to the multimeter but now it doesn't work.........

I changed nothing just exited Mach had my tea came out and tried it again but nope no output.....

I'd sure appreciate some advice here.......I've read somewhere and can't remember where that Mach has intermittent PWM issues is this true?????
« Last Edit: May 02, 2012, 04:22:18 PM by Mad Welder »
Re: Mach and PWM VFD setup help please
« Reply #1 on: December 07, 2012, 08:10:42 AM »
I believe that for VFD you don't use step and direction output.  YOu have one output for teh 1st relay on the VFD which is FOR/REV and another output that goes to Start/Stop and an analog output.  I don't remember the #'s of port and pin set aside for that on teh C32.   

Offline Tweakie.CNC

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Re: Mach and PWM VFD setup help please
« Reply #2 on: December 07, 2012, 08:28:29 AM »
You may find this thread of interest http://www.machsupport.com/forum/index.php/topic,15455.0.html

Re: Mach and PWM VFD setup help please
« Reply #3 on: December 07, 2012, 08:37:40 AM »
so teh author of the tutorial said that they themselves don't know why the MACH calls for step and direction and they put a fictitious port and pin in there to make the program happy.  Thats what I understood.  Is that worng?