LiCHUAN A5 AC Servo Fine tunning
- RoberCNC
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08 Aug 2025 09:40 #333037
by RoberCNC
LiCHUAN A5 AC Servo Fine tunning was created by RoberCNC
I'm having fine-tuning issues with the popular LiCHUAN servos. After initial setup and configuration, I'm experiencing problems with small circles. Instead of circles, I'm getting ellipsoids. Has this happened to anyone else?
The manufacturer simply varies two parameters that I've already modified without solving them. I'm sure it's due to these drivers, since I previously installed DMM servos and this didn't happen. I ran the autotuning program and got perfect circles.
The LiCHUAN servos don't have an autotuning program, which leads me to think it's due to manually adjusting some of the multiple parameters, but I don't know which ones or how.
The manufacturer simply varies two parameters that I've already modified without solving them. I'm sure it's due to these drivers, since I previously installed DMM servos and this didn't happen. I ran the autotuning program and got perfect circles.
The LiCHUAN servos don't have an autotuning program, which leads me to think it's due to manually adjusting some of the multiple parameters, but I don't know which ones or how.
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- andypugh
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08 Aug 2025 19:08 #333057
by andypugh
Replied by andypugh on topic LiCHUAN A5 AC Servo Fine tunning
Elipsoids sounds like a difference in dynamic motion between the X and Y axes. The two probably have different masses, and will have diferent limits.
You may need to reduce the accelerations in the INI to something that both joints can follow. If that makes things circular again then you can maybe look at tuning to improve dynamic resonse, but you will still need to set the accel limits to whatver the slower joint can manage,
You may need to reduce the accelerations in the INI to something that both joints can follow. If that makes things circular again then you can maybe look at tuning to improve dynamic resonse, but you will still need to set the accel limits to whatver the slower joint can manage,
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09 Aug 2025 08:10 #333095
by RoberCNC
Replied by RoberCNC on topic LiCHUAN A5 AC Servo Fine tunning
I totally agree, Andy. The Y axis is the LiCHUAN. I'm convinced it's due to acceleration and speed. Would you start by modifying the INI file? Wouldn't you look for it via the driver's own parameters?
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10 Aug 2025 17:01 #333177
by andypugh
Replied by andypugh on topic LiCHUAN A5 AC Servo Fine tunning
I would first reduce the acceleration in the INI and see if that makes a difference, just because that is quick and easy. (and you know exactly what you have changed, which might not be the case with tuning software).
That's probably not the final solution, but it may help narrow-down the problem description.
That's probably not the final solution, but it may help narrow-down the problem description.
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11 Aug 2025 10:38 #333206
by RoberCNC
Replied by RoberCNC on topic LiCHUAN A5 AC Servo Fine tunning
Okay, I understand what you're saying. One option I'd considered is to connect the driver's OnPos signal to an input on the MESA card to cushion these offsets due to speed and acceleration, so the program doesn't continue reading until they're reached. I don't know if that makes sense or if it's just a wishful thinking.
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- MaxEkb77
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14 Aug 2025 08:12 #333387
by MaxEkb77
Replied by MaxEkb77 on topic LiCHUAN A5 AC Servo Fine tunning
You have encoder feedback ?
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14 Aug 2025 08:46 #333390
by RoberCNC
Replied by RoberCNC on topic LiCHUAN A5 AC Servo Fine tunning
No, I don't have any kind of output connected to the MESA
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