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HiCON Motion Controller / HiCON 7766 Linear Encoder vs. Easy Servo (Leadshine)
« on: April 15, 2018, 03:43:19 PM »
Hi
I'm weighing the pros and cons of closed loop operation with the 7766. Can you guys check my assumptions here?
I am planning Leadshine 3-phase AC Easy Servos in my machine setup, and am converting a Weiss 32.
Case 1: Employ absolute linear scales, feeding back to the 7766.
- If I understand correctly, this should be the tightest loop possible, with the most accuracy and repeatability.
- It should also effectively negate any ballscrew non-linearity, since the ballscrew would be "inside" the motion loop.
- I suspect as a con that the resolution of the steppers is the limiting factor for accuracy, effectively degrading the scales.
- I *think I lose the force vectoring function of the Easy Servos, since I presume I can't employ both loops simultaneously.
Case 2: Direct the Easy Servo Motor encoder feedback to the 7766.
- This appears to be a HiCon supported configuration, and it looks like the breakout boards are compatible with the Leadshine drives.
- This will require external drive mapping to correct non-linearity.
- I'm confused about whether this allows the closed-loop force vectoring functions of the Leadshine to be used simultaneously to the 7766 closed loop functions.
Can you guys give me any advice?
Thanks
P
I'm weighing the pros and cons of closed loop operation with the 7766. Can you guys check my assumptions here?
I am planning Leadshine 3-phase AC Easy Servos in my machine setup, and am converting a Weiss 32.
Case 1: Employ absolute linear scales, feeding back to the 7766.
- If I understand correctly, this should be the tightest loop possible, with the most accuracy and repeatability.
- It should also effectively negate any ballscrew non-linearity, since the ballscrew would be "inside" the motion loop.
- I suspect as a con that the resolution of the steppers is the limiting factor for accuracy, effectively degrading the scales.
- I *think I lose the force vectoring function of the Easy Servos, since I presume I can't employ both loops simultaneously.
Case 2: Direct the Easy Servo Motor encoder feedback to the 7766.
- This appears to be a HiCon supported configuration, and it looks like the breakout boards are compatible with the Leadshine drives.
- This will require external drive mapping to correct non-linearity.
- I'm confused about whether this allows the closed-loop force vectoring functions of the Leadshine to be used simultaneously to the 7766 closed loop functions.
Can you guys give me any advice?
Thanks
P