Re: MACH3 and Spindle PWM output
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I set up an older PC that had MACH2 since it has a parallel port.? Installed MACH3 on it and just got things rolling.? Need to bring the scope over.? With the meter it looks like it's all working correctly but hard to tell. ? Have to run out for a while but I'll report back with the details. ? And no, not using the PMDX-107.? An external PWM to 10V module. ? Thanks for the feedback. John ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Steve Stallings
Sent: March-17-23 5:14 PM
To: [email protected]
Subject: Re: [MachCNC] MACH3 and Spindle PWM output? If you are using a PMDX-107 with your PMDX-126, then it sounds like you have the signals on the wrong pins.
The PMDX-107 expects the PWM signal on Pin 16 and the Direction signal on Pin 14. Optionally the PMDX-107 can also monitor the Pin 17 "Charge Pump" as a safety measure.
When using the PMDX-107 you do not need a "Motor ON" signal, the PMDX-107 monitors the PWM and turns the motor on when the PWM is pulsing. There is one quirk that can happen. If the S command asks for exactly the maximum for a pulley, Mach3 will generate a solid signal that never pulses if using the parallel port driver. In this case the PMDX-107 does not see any pulses and does not turn on. Not sure is this is also true for a SmoothStepper. Work around for this is to make your max for the pulley be 1 more RPM that the highest S command that you issue, i.e. for a 24000 RPM router spindle set the pulley max range to 24001.
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