[Dsg-halla] Replacement schedule of Hall A PLC in Dynapower MPS

[Brian Eng]

Jack,

Have you had a chance to look through the test procedure from Dynapower to see what needs to be tested / can be skipped?

Also, we found that the DC Output modules aren't changing state as fast as one of the timers that is connected to an output channel.

So either something went wrong in the conversion, the channel isn't actually being used, or it is also toggling at a slower rate.
Is there any issue with us probing the that output to see what it's doing on the current PLC?

> On Apr 5, 2019, at 10:13 AM, Brian Eng <beng at jlab.org> wrote:
>
> Hi Jack,
>
> I'll be tied up with other work for most of April, but I think we can still at least start on preparing to swap the PLCs out.
>
> The first thing we need to do is test and verify that the current PLC does what it's supposed to.
>
> I was thinking that a subset of what Dynapower did would be a good starting point?
>
> https://hallaweb.jlab.org/tech/Detectors/public_html/hall_a/magnets/high_resolution_spectrometers/dipole/dynapower/of_historical_interest_only/dynapower_test_procedure_and_results_original.pdf
>
> So when you (or whoever from Hall A can help with this) are available we can do the first test and come up with a new procedure that would be followed when the upgraded PLC is installed.
>
> --
> Brian Eng
> Detector Support Group
> 757-269-6018
>
>> On Apr 5, 2019, at 9:22 AM, Jack Segal <segal at jlab.org> wrote:
>>
>> Due date is June 1, 2019. Thanks for the nudge! I believe we can begin to actually work on it at any time. The magnets are still cold. Cryo will need a "heads up" whenever we ramp things up and down. It will be best to start on the Left Arm. The Right Dipole is the one with an internal short. If something trips it is more problematic for Cryo. The hall will be in Restricted Access this whole time, except 4-29 through 5/1 to remove the Tritium cell.
>> From: Peter Bonneau
>> Sent: Friday, April 5, 2019 8:54:43 AM
>> To: Jack Segal; dsg-halla at jlab.org
>> Subject: Replacement schedule of Hall A PLC in Dynapower MPS
>>
>> Hi Jack,
>>
>> What is the due date for the replacement of the PLC in the Dynapower MPS?
>>
>> Regards,
>> Peter