Re: ePID deadband on output

["Pearson, Matthew R." <pearsonmr@ornl.gov>]

Hi,

Would it make sense to implement both modes, one IIR filter and one time-bound deadband? The IIR approach makes sense: If the error gets small enough, turn off the control, and only turn it on again until the error increases too much. The time-bound approach would deal with the case where the user wants control turned off after N seconds, as long as it's been within the deadband that long (which might be more deterministic in some cases).

Cheers,
Matt


On Aug 26, 2014, at 3:17 PM, Bruce Hill <bhill@slac.stanford.edu> wrote:

> Hi Matt,
> I used discrete records for this instead of modifying the epid record.
> If you have time to look into implementing this in epid, that would be great.
> Thanks!
> - Bruce
> 
> On 8/26/2014 7:38 AM, Pearson, Matthew R. wrote:
>> Hi,
>> 
>> It sounds like it would work for my application.
>> If there is no ePID code, I would be willing to implement it in the ePID.
>> 
>> Cheers,
>> Matt
>> 
>> 
>> On Aug 26, 2014, at 8:07 AM, "Dalesio, Leo" <dalesio@bnl.gov> wrote:
>> 
>>> Hi Bruce.
>>> Did you make this part of the ePID record? I have not looked at that code for a while. Did you modify the record? Could you send the code? I think it would be a good modification. There are a number of situations where motors should not be dithering.
>>> Bob
>