From: stephanie snedden
Subject: Re: 2.5m obslog 20090705 (MJD 55018)
Date: Mon, 6 Jul 2009 11:53:33 -0600
Also, we are one week away from summer shutdown, so I don't think we
need to rush to build a new MCP for ease of night operations. This
raises a related question: are other changes scheduled for shutdown
that would require a new MCP? If so, we might as well wait for those
changes.
Steph
On Jul 6, 2009, at 11:37 AM, Dan Long wrote:
>>> Dan Long visited site and adjusted PID values for rotator.
>>> The new rotator values are P=50, I=4, D=160.
>>
>> Do we expect to need new PID coeffs when we switch out
>> amplifiers?  I'm a bit surprised.
>>
>> Anyway,  do we need a new MCP with these values as the default?
>>
>> 				R
>
> Hi Robert,
>
>   The analog module in the Glentek has many trim pots for tuning the
> amplifier response to a given motor setup, so unfortunately that
> makes each Glentek essentially unique.  We do have the option of
> adjusting the pots on the module to change performance, but if
> things are close it is much easier to tweak the PID loop.
>
>   At this time we are uncertain as to the cause of the "no-current"
> mode the rotator gets into, so things may well change again before
> it is sorted out.  I would hold off on a new MCP for now.
>
> 				Cheers,
>
> 				  Dan
>
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