Difference between revisions of "PID Tuning COMDEF"
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A common principle in motion-control is that axes are tuned with a balance of speed and precision. As maximum speed increases, motion precision will drop. As maximum speed decreases, the motion precision can be increased. This is not unique to any one control system. It is a universal principle. | A common principle in motion-control is that axes are tuned with a balance of speed and precision. As maximum speed increases, motion precision will drop. As maximum speed decreases, the motion precision can be increased. This is not unique to any one control system. It is a universal principle. | ||
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| − | + | Push-bend bend arm motion can move very slowly - a fact that can be used to tune the axis in that condition for extreme high-precision without creating problems. Draw-bending bend arm motion needs to be faster, so the axis can be tuned for lower-precision. | |
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| − | It examines the bending mode - either push-bend or draw-bend, then selects which PID command is inserted in the processlist | + | CNC Bender takes advantage of this principle for the different bend modes available. It examines the bending mode - either push-bend or draw-bend, then selects which PID command is inserted in the processlist. |
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Note that when we apply the term "lower-precision" to draw-bending, our systems are often many times more accurate than many competing systems. (It can be proved.) So the term "low" is relative to our system alone. "High-precision" means VERY high precision. | Note that when we apply the term "lower-precision" to draw-bending, our systems are often many times more accurate than many competing systems. (It can be proved.) So the term "low" is relative to our system alone. "High-precision" means VERY high precision. | ||
Revision as of 16:25, 7 October 2009
A common principle in motion-control is that axes are tuned with a balance of speed and precision. As maximum speed increases, motion precision will drop. As maximum speed decreases, the motion precision can be increased. This is not unique to any one control system. It is a universal principle.
Push-bend bend arm motion can move very slowly - a fact that can be used to tune the axis in that condition for extreme high-precision without creating problems. Draw-bending bend arm motion needs to be faster, so the axis can be tuned for lower-precision.
CNC Bender takes advantage of this principle for the different bend modes available. It examines the bending mode - either push-bend or draw-bend, then selects which PID command is inserted in the processlist.
Note that when we apply the term "lower-precision" to draw-bending, our systems are often many times more accurate than many competing systems. (It can be proved.) So the term "low" is relative to our system alone. "High-precision" means VERY high precision.
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