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MC_Velocity in Speed Axis

2/18/2021 10:29 AM	Rate (0)
Bill_Raptakis Posts: 40 Rating: (0)	Hello, I want to control a speed axis and I want to control speed via a PID compact. So I fix the PID, that use input and output, I scaled the PID output and give it in rpm to MC_velocity, when i have changes in velocity and direction from pid the MC velocity function don't send these changes to drive... I'm trying with continuous execute and with pulse execute but doesn't work... Do you have an idea? it need to work with sina_speed and not with mc_velocity? Also I have a problem with PID, I have a set point and an actual value when the actual value is higher than set point PID doesn't give output, if the actual value is lower than set point PID output works.
Bill_Raptakis Posts: 40 Rating: (0)	Last edited by: Bill_Raptakis at: 02/18/2021 10:33:23
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2/18/2021 1:16 PM	Rate (1)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 12/29/2025 Posts: 5149 Rating: (772)	If you want to use MC_Velocity then call it once with max speed of the axis and use the PID to control override.velocity.
	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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2/18/2021 6:58 PM	Rate (0)
miami Platinum Expert Joined: 8/31/2005 Last visit: 12/16/2025 Posts: 2198 Rating: (331)	With a rising signal at Execute the MC_MoveVelocity transfers the setpoint once to the drive. You have to retrigger (remove the true-signal for one cycle) to transfer a new setpoint. But the command for jogging (MC_Jog or MC_MoveJog, I can't remember) permanent transfers the setpoint to the drive as long as one direction is selected. You may use it to (nearly) get the behavior you wanted for MC_MoveVelocity. Or you use the "override" as Jacek mentioned.

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2/19/2021 7:13 AM	Rate (0)
Bill_Raptakis Posts: 40 Rating: (0)	Thanks for your answers, yes it's work with overide.velocity!
Bill_Raptakis Posts: 40 Rating: (0)
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This contribution was helpful to 1 thankful Users cliff.pennalligen

6/30/2024 4:48 PM	Rate (0)
gege8181 Posts: 24 Rating: (0)	bonjour, j'ai le même problème, quelle est la dérogation ? MERCI
gege8181 Posts: 24 Rating: (0)
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