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Author
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Topic: UPS selection
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Leo Enticknap
Film God
Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 09-26-2018 11:44 AM
IMHO, they are all much of a likeness. There are some APC models which Doremi servers can automatically monitor via an installable hotfix, and initiate a shutdown procedure if the mains power goes out, and possibly some others that could be similarly rigged via GPIO, and/or IP control via APIs (though I've never installed the latter).
Keep in mind that if you don't have any kind of automated emergency action that is triggered by your UPS, the only point in having one is to mitigate the effect of a brownout (mains voltage drops momentarily, but doesn't actually fall to zero), or a very short actual blackout. It's not going to help you in the event of a power cut that goes on for any significant length of time.
The ideal is a unit that (a) has enough charge capacity to run the lamp extract fans for 5-10 minutes (to prevent lamp damage in the event of a prolonged power cut), and (b) can be automated, such that if the power goes out long enough for the battery to be drained to the point at which you only have just enough power left to perform an orderly shutdown of the projector and server, the shutdown process is started.
The lead acid batteries typically last for around 5 years before needing to be replaced. Running a UPS with worn out batteries can cause absolute chaos for the stuff connected to it. I recently had to do a prolonged troubleshoot of a Barco DP4K-23B/DSS220/cat745 installation. The projector's card cage electronics, plus the server and automation controller (MiT IMC2-B) were all powered through the (Tripp-Lite, though I don't think it made any difference) UPS. All sorts of wackiness was going on - cues would fire when not wanted and not when they were, the IMB would disconnect from the server in the middle of a show, the lamp would suddenly go out: it was like a colony of gremlins had taken up residence in the pedestal. Eventually, the UPS went out and simply refused to boot up again. I opened it, and found bulged and leaky batteries, which had been in use since 2011. Removed them, cleaned up the inside of the chassis, replaced the batteries, and that screen has run without any problems ever since.
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