[Halld-jlab] Equipment Power OFF

[Beni Zihlmann]

Hi David,

the F125 can be powered off. In that state the crate consumes about 15 
to 20 Amps on the 5 volt
line if the modules are powered (like now) the power goes up to 112 Amps 
or more on the 5 volt line
depending on how many modules are in the crate.
The current status is that once the DAQ starts a run the modules are 
powered up and never powered down
any more unless you reboot the crate. After reboot the modules come up 
in power-off mode.

cheers,
Beni


> 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
>>> <barbosa.vcf>_______________________________________________
>>> Halld-jlab mailing list
>>> Halld-jlab at jlab.org
>>> https://mailman.jlab.org/mailman/listinfo/halld-jlab
>
>
>
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