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michaelkroneberger9
michaelkroneberger9
Associate
December 6, 2011
Question

L6470: GoTo-Command, higher speed resolution?

  • December 6, 2011
  • 2 replies
  • 654 views
Posted on December 06, 2011 at 08:58

Hello

We’re currently testing the possibility of using the L6470. It’s working well in full rotation with using the “Run�-command.

Additional, we want to perform a ±pos mode with intermediate points and a defined speed between the positions. The “GoTo�-command seems to be the right one for this job, but the resolution of MaxSpeed, which is used by this command, is too bad. Is there any way to use speed in the resolution of 2^20 like the “Run� or “GoUntil�-commands?

 Best regards

 Michael

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2 replies

Enrico Poli
Enrico Poli
ST Employee
December 14, 2011
Posted on December 14, 2011 at 10:54

Dear Michael,

during the positioning commands (GoTo, Move, etc) the speed profile is defined by the MAX_SPEED parameter and there is no way to bypass its resolution limit.

A possible solution is to use a Run - GoTo sequence:

- Use the Run command to set the cruise speed

- Polling on ABS_POS register (or monitor the SYNK signal)

- When you are approaching the target position send a GoTo command with a MAX_SPEED value lower than the cruise speed

Kind Regards

Enrico

michaelkroneberger9
michaelkroneberger9Author
Associate
December 22, 2011
Posted on December 22, 2011 at 14:22

Dear Enrico,

Thanks for your comment. I will try it with the SNYC-signal. It’s a little bit contrary to our plan to delegate more control jobs to the driver, but if there is no other solution…

Best Regards

Michael

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