On 05/27/2018 10:54 PM, Gene Heskett wrote:
To Jon; I had to reset the pwm-servo several times, it was
tripping off at the m5, which is completely off while the
motor was cranking the spindle at 1500. So thinking about
the motors emf, I put an s100, g4p.5 in front of the m5.
Hasn't tripped again.
Yes, you certainly don't want to do a harsh reversal. Even
with a VFD on my Bridgeport, I have a lowpass filter to make
the spindle start/stop and reversal more gradual. I put the
filter in between
motion.spindle-speed-out and the DAC that drives the VFD.
In this particular case, the VFD takes digital direction
commands and a unipolar speed command, so I use the abs
component to convert +/- values to all +.
net spindle-speed motion.spindle-speed-out => mult2.1.in0
setp mult2.1.in1 0.002457
net spindle-DAC-cmd mult2.1.out => lowpass.0.in
net spindle-DAC-filt lowpass.0.out => abs.0.in
setp lowpass.0.gain 0.005
net spindle-DAC-abs abs.0.out => ppmc.0.DAC.03.value
Doing it with the filter means you never have to think about
doing this in every G code program.
The first setp has a cal factor for one belt ratio setting
to spindle speed. The second setp sets the time of the
lowpass smoothing. You can also use limit3 to do this.
Jon
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