On 04/07/2016 09:57 AM, Nicklas Karlsson wrote:
> I have tried torque mode with only one loop and it is 
> possible to get it to work without feed forward, descent 
> or not is however another question. With FF should be 
> better. Second derivtive feed foward should be sensitive 
> to load variations.
Feed Forward will NEVER be sensitive to load variations.  It 
is derived entirely from commanded position, commanded 
velocity, commanded acceleration, without any input from the 
actual position, velocity, acceleration.

Jon

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