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<div class="moz-cite-prefix">Hi David,<br>
<br>
the F125 can be powered off. In that state the crate consumes
about 15 to 20 Amps on the 5 volt<br>
line if the modules are powered (like now) the power goes up to
112 Amps or more on the 5 volt line<br>
depending on how many modules are in the crate.<br>
The current status is that once the DAQ starts a run the modules
are powered up and never powered down<br>
any more unless you reboot the crate. After reboot the modules
come up in power-off mode.<br>
<br>
cheers,<br>
Beni<br>
<br>
<br>
</div>
<blockquote cite="mid:5568A235.7010508@jlab.org" type="cite">Hi
David,
<br>
<br>
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.
<br>
<br>
Best regards,
<br>
Fernando
<br>
<br>
<br>
On 5/29/2015 8:58 AM, David Lawrence wrote:
<br>
<blockquote type="cite">Hi Fernando,
<br>
<br>
I seem to recall that our fADC modules could be put into a
low power consumption mode when not in use.
<br>
Do your numbers assume this? I would like to spend some time
each week on the development of the
<br>
event-tagging and L3 systems. Much of this will require all
crates with digitization modules. Even without
<br>
my testing I can imagine most of these crates will get turned on
at least once a week for some test or acquisition
<br>
of cosmic data. Is it worth us exploring a mechanism to
basically put crates into sleep mode either by
<br>
hand (via script) or when a period of inactivity is detected?
I’m just a little worried that nothing will really be
<br>
off for 2 weeks at a time so your basic concern won’t be
addressed.
<br>
<br>
Regards,
<br>
-David
<br>
<br>
On May 27, 2015, at 2:01 PM, Fernando J Barbosa
<a class="moz-txt-link-rfc2396E" href="mailto:barbosa@jlab.org"><barbosa@jlab.org></a> wrote:
<br>
<br>
<blockquote type="cite">Hi all,
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
Thanks for your input in advance and best regards,
<br>
Fernando
<br>
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</blockquote>
</blockquote>
<br>
<br>
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