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Acceleration of Virtual Axis

Created by: valyy at: 3/10/2017 10:24 AM (8 Replies)

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3/10/2017 10:24 AM	Rate (0)
valyy Posts: 55 Rating: (0)	Dear all, A strange thing happens, The actual acceleration value of a virtual axis remains at zero if I Use the move command from simotion. It works fine if I give the command from control panel. Do you have some explanation about it? Thank you Best Regards V.Vavassori
valyy Posts: 55 Rating: (0)
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3/10/2017 12:39 PM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 1/20/2026 Posts: 5155 Rating: (772)	Is the axis enabled?
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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This contribution was helpful to 1 thankful Users Jeff Casagrande

3/10/2017 1:56 PM	Rate (0)
valyy Posts: 55 Rating: (0)	Hello Jacek D Yes, the virtual axis is enabled and Reaches the speed setpoint, only the value of acceleration remains at 0.0. Attached some current values from TO. Attachment 0001.JPG (351 Downloads)
valyy Posts: 55 Rating: (0)
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3/10/2017 2:16 PM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 1/20/2026 Posts: 5155 Rating: (772)	Hmmm... When something moves at constant speed, then the accel is 0. That's normal I'd say. In case of virtual axes od course as they are ideal.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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3/10/2017 2:24 PM	Rate (0)
valyy Posts: 55 Rating: (0)	I agree with what you say. I do not understand why the virtual axis remains at constant speed even during the ramp.
valyy Posts: 55 Rating: (0)
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3/10/2017 2:58 PM	Rate (1)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 1/20/2026 Posts: 5155 Rating: (772)	The accel is so hight, that the ramp is so short that you cannot see it? As some say - virtually instant
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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3/10/2017 4:31 PM	Rate (0)
valyy Posts: 55 Rating: (0)	So, this means that from a virtual axis can not obtain the actual acceleration.
valyy Posts: 55 Rating: (0)
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3/10/2017 4:49 PM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 1/20/2026 Posts: 5155 Rating: (772)	motionStateData.commandAcceleration - check this. And use Trace.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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This contribution was helpful to 1 thankful Users valyy

3/15/2017 4:24 PM	Rate (0)
valyy Posts: 55 Rating: (0)	Hello Jacek D I performed some tests, it seems that as you rightly suggested, the dynamics of a virtual axis is extremely rapid. By changing the default parameters "velocity profile" as attached images I could finally see the current value of the acceleration. Thank you for your valuable support. V.Vavassori Attachment 002.JPG (350 Downloads)
valyy Posts: 55 Rating: (0)
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This contribution was helpful to 1 thankful Users jacek d

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