[Halld-jlab] Equipment Power OFF

[David Lawrence]

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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