Re: [Emc-users] PWM tuning with hostmot2 and 7i33

[Peter C. W. <pc...@me...>]

On Sat, 3 Oct 2009, Eric H. Johnson wrote:

> Date: Sat, 3 Oct 2009 16:14:20 -0400
> From: Eric H. Johnson <ejo...@ca...>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc...@li...>
> To: "'Enhanced Machine Controller (EMC)'" <emc...@li...>
> Subject: Re: [Emc-users] PWM tuning with hostmot2 and 7i33
> 
> Peter,
>
>>> Heres what I would check:
>
> Can you get a HALScope plot of the step response? <<
>
> Yes, but not until Monday when I will be back at the shop.
>
>>> Do you have velocity or torque mode amplifiers?
>
> (Torque mode amplifiers will typically require a higher sample rate and are
> tougher to tune)
> your .6" error even with a P of 20 suggests torque mode to me. <<
>
> Velocity


So how can a .6"  error which must be a large number of encoder counts not 
generate even a small velocity to correct the error, something is really wrong 
here...

Peter Wallace
Mesa Electronics

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