Re: pmdx - 107

[CNC Noob]

Ok, Back to messing with my spindle after a summer of working in other areas of the machine.
Pully ratios appear to have no effect on my actual spindle speed. Can't get my spindle to run
at anything less than 3600 rpm. The previous controller that I replaced with the PMDX-126 &
107, ESS & Mach3 would start the spindle much lower. 100 rpm as an example. The spindle
motor itself says it's capable of 24,000 RPM MAX, but think it only really goes to 18,000 RPM.

 Is there a setting in the PMDX, ESS or Mach3 where I can adjust the minimum RPM to lower
than 3600 RPM? Tried everything I can see in all the settings all over Mach3. Won't budge any
lower than 3600 RPM. Maybe I am missing something.

[Steve Stallings]

The only setting in Mach3 that should be forcing a minimum speed would
be the Config > Port and Pins > Spindle Setup dialog which has a place
for Minimum PWM %. If the requested speed would result in less than
this setting, Mach3 will bump the speed and put a message in the status
line at the bottom of the screen telling you that it has done this.

Have you reviewed the application notes here?

http://www.pmdx.com/Doc/AN002_PWMSpindleSmoothStepper_02.pdf

You may also have settings in your VFD that force a minimum speed.

[Bob at PMDX]

See this thread for the rest of this discussion:

http://www.pmdx.com/PMDX-Forums/index.php?topic=179.0