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Author Topic: Mach3 PWM issues  (Read 1371 times)

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Offline JMF

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Mach3 PWM issues
« on: February 26, 2014, 11:12:43 AM »
I've checked the forums until my head hurt and am not getting anything.

I had my Mach3 setup to run my 2.2KW spindle using the PWM and a G540, it was working fine until recently, now if I check the output voltage that goes to the VFD, it's always ~8.4 volts with a 10v input to the G540, I checked pin 14 on the parallel port with a scope and it's a 25khz signal at 50/50 duty cycle, it does not change at all, it's just a nice square wave, I'm running out of ideas, what happened to Mach3, as I said it was working ?

Any help would be appreciated.

  Thanks,
        John
Re: Mach3 PWM issues
« Reply #1 on: February 28, 2014, 12:30:26 PM »
According to the G540 manual, it expects to see 50 Hz on pin 14.  If your PC is outputting 25kHz, then something in the "ports and pins" config may be wrong.  Look at p86 (5-28 on paper) section 5.5.5.2 of the Install/config manual.

Offline JMF

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Re: Mach3 PWM issues
« Reply #2 on: February 28, 2014, 01:02:48 PM »
Thanks, I'll look into it further...