Spindle Speed Works CW But Not CCW
04 Oct 2013 19:02 #39535
by jorsborn
Spindle Speed Works CW But Not CCW was created by jorsborn
I recently added the ability to control my spindle direction. While it works just fine I lose the ability to control the spindle speed when running CCW. So...
I haven't changed anything with my HAL file other than adding the following lines...
To the existing...
Any thoughts?
- Running CW (M3) I get proper direction and speed
- Running CCW (M4) I get proper direction but no speed control. I can see via HALscope that the PWM generation ceases at this point.
I haven't changed anything with my HAL file other than adding the following lines...
net spindle-fwd motion.spindle-forward => parport.0.pin-17-out
net spindle-rev motion.spindle-reverse => parport.0.pin-01-outTo the existing...
loadrt pwmgen output_type=0
addf pwmgen.update servo-thread
addf pwmgen.make-pulses base-thread
net spindle-speed-cmd motion.spindle-speed-out => pwmgen.0.value
net spindle-on motion.spindle-on => pwmgen.0.enable
net spindle-pwm pwmgen.0.pwm => parport.0.pin-14-out
# Set the spindle's top speed in RPM
setp pwmgen.0.scale 24000
setp pwmgen.0.offset -.006Any thoughts?
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04 Oct 2013 19:12 #39538
by cncbasher
Replied by cncbasher on topic Spindle Speed Works CW But Not CCW
dependent on the speed controller you have , they either have a + - pwm or only like a + pwm value , so when you select reverse , linuxcnc is supplying by default a negative pwm
where the controller you have perhaps only can accept a positive pwm level .
what speed controller or spindle interface are you using ?
where the controller you have perhaps only can accept a positive pwm level .
what speed controller or spindle interface are you using ?
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04 Oct 2013 20:46 #39544
by jorsborn
Replied by jorsborn on topic Spindle Speed Works CW But Not CCW
I am using the HuanYang VFD which accepts a 0-10V signal for speed (PWM->Analog). However, the problem seems to be LinuxCNC and not my VFD. Looking at HAL Scope I don't see any output from PWM generator when run CCW where as I do see output when it is run CW. It's simply not manipulating the output pin.
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05 Oct 2013 01:11 #39558
by PCW
Replied by PCW on topic Spindle Speed Works CW But Not CCW
loadrt pwmgen output_type=1
(man pwmgen)
(man pwmgen)
The following user(s) said Thank You: jorsborn
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05 Oct 2013 03:38 #39559
by cncbasher
Replied by cncbasher on topic Spindle Speed Works CW But Not CCW
pcw's beat me to the answer , that should get you going , just post again if you still have problems
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05 Oct 2013 11:44 #39571
by jorsborn
Replied by jorsborn on topic Spindle Speed Works CW But Not CCW
Thank you both... that solved the problem.
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