[Halld-jlab] Equipment Power OFF

[Fernando J Barbosa]

Hi David,

     Power-saving modes are not available in these modules. Given your 
need to use all of these modules on a weekly basis, there is no apparent 
benefit in turning power off to the VXS and VME crates. There is, 
however, still the possibility of turning off all the LV, bias and HV 
chassis but I have received no feedback on these yet.

Best regards,
Fernando


On 5/29/2015 8:58 AM, David Lawrence wrote:
> Hi Fernando,
>
>    I seem to recall that our fADC modules could be put into a low power consumption mode when not in use.
> Do your numbers assume this? I would like to spend some time each week on the development of the
> event-tagging and L3 systems. Much of this will require all crates with digitization modules. Even without
> my testing I can imagine most of these crates will get turned on at least once a week for some test or acquisition
> of cosmic data. Is it worth us exploring a mechanism to basically put crates into sleep mode either by
> hand (via script) or when a period of inactivity is detected? I’m just a little worried that nothing will really be
> off for 2 weeks at a time so your basic concern won’t be addressed.
>
> Regards,
> -David
>
> On May 27, 2015, at 2:01 PM, Fernando J Barbosa <barbosa at jlab.org> wrote:
>
>> Hi all,
>>
>> Based on previous discussions, I would like for you to consider turning off the electronics (crates, LV and HV chassis) during this beam off period. Saving energy (money and less CO2 in the atmosphere) and possibly extended longevity of the electronics are appropriate to consider. For reference, power consumption is nominally 1.5kW-hr per chassis or ~ 90kW-hr total for Hall D.
>>
>> Although there is reluctance in switching equipment on and off, I would recommend switching off any equipment that is not in use or that will not be used for a period of at least 2 weeks. The power supplies in use have soft start attributes which limit in-rush currents to safe operating levels if performed in a controlled manner, i.e. remote or front panel.
>>
>> A power outage period is anticipated for Hall D, probably in June according to Tim, but the actual schedule is not known at this time. Tim will send an email at the appropriate time.
>>
>> Please, send me an estimate of expected usage (schedule would be grate) for each sub-system and we will start shutting off equipment in 2 weeks. I would also suggest considering this as a normal part of hall operations in the future.
>>
>> Thanks for your input in advance and best regards,
>> Fernando
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