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Old 06-29-2018, 01:41 PM   #1
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Default UPS Selection

I am looking for some different types of UPS people have used and some reviews about them. I have talked to my supply house but they only carry the Phoenix Contact series and I would need to get the battery supply and UPS module separately, I was kind of hoping to get it all in one. Thank you for your help
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Old 06-29-2018, 01:45 PM   #2
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size ? rating ? (is this for a baseball stadium or some kid's xbox ?)
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Last edited by wildleg; 06-29-2018 at 01:48 PM.
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Old 06-29-2018, 02:22 PM   #3
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Size KVA
Voltage in out
Battery time
True Online double conversion
or off line.
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Old 06-29-2018, 03:23 PM   #4
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We need to know the load and what you want to do with it.
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Old 06-29-2018, 03:36 PM   #5
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And if it's for a dedicated IT server room it needs EPO capabilities.........
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Old 06-29-2018, 04:12 PM   #6
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And if it's for a dedicated IT server room it needs EPO capabilities.........
Not true, buckaroo.
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Old 06-29-2018, 05:44 PM   #7
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Not true, buckaroo.
Well, I've been made to design it this way, the code cited was NEC 645.10 and 645.11. Not necessary if the power is limited to 750VA or less, but that's pretty small.


Just re-read it in the 2014, it's right there. (My 2017 is at work)
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Old 06-29-2018, 07:27 PM   #8
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Well, I've been made to design it this way, the code cited was NEC 645.10 and 645.11. Not necessary if the power is limited to 750VA or less, but that's pretty small.


Just re-read it in the 2014, it's right there. (My 2017 is at work)
You're missing the part where 645 only applies if you're using one of the more lenient wiring methods allowed by 645. If you use ordinary wiring methods, no EPO is required. Don't wire with rubber cord under a raised floor, for instance.
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Old 06-30-2018, 12:08 PM   #9
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Old 06-30-2018, 04:36 PM   #10
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Not true, buckaroo.
Imagine the response to "what's this button do"?
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Old 07-06-2018, 04:39 PM   #11
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It is a small UPS. It is 24 VDC and 60 Watts
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Old 07-06-2018, 04:44 PM   #12
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I am wanting to power a PLC, and satellite communication module. The PLC is on remote well sites where grid power is not available. So we run our Units off of Genset power. and we have up to 4 units per site. There are times when one unit shuts down but the others do not. If the unit that is powering the PLC goes down but the others stay running i am looking for the PLC to sense that open one relay and close another to maintain power
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Old 07-06-2018, 05:20 PM   #13
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So your run time is how long?
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Old 07-06-2018, 05:22 PM   #14
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It will vary. From milliseconds to 12 hours. My supply house carries the phoenix contact UPSs
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Old 07-06-2018, 05:36 PM   #15
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I am wanting to power a PLC, and satellite communication module. The PLC is on remote well sites where grid power is not available. So we run our Units off of Genset power. and we have up to 4 units per site. There are times when one unit shuts down but the others do not. If the unit that is powering the PLC goes down but the others stay running i am looking for the PLC to sense that open one relay and close another to maintain power
Wow, that is a really really really dumb way to arrange for generator starting.

Now that I have that off my chest, your answer seems pretty simple. Get the wattage off the power supply/backplane of your PLC rack, multiply by 12 hours, and select your UPS. PLC suppliers all have their own branded UPS's, but they're rebranded major brand UPS's. In your case it would be nice to have one that you can monitor battery health through your SCADA system, but that would be unnecessary if you do regular genset PM already. Just check batteries Ah life left when you do gen PM.
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Old 07-09-2018, 10:40 AM   #16
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so i am looking for some suggestions of UPSs that are out there. I can go thru the calculations to figure out the A-h needed. It is the different kinds of UPSs that are out there
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Old 07-09-2018, 10:44 AM   #17
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so i am looking for some suggestions of UPSs that are out there. I can go thru the calculations to figure out the A-h needed. It is the different kinds of UPSs that are out there
Ford, Chevy, Dodge.

I've tended to stick with APC, which are also rebranded as a whole bunch of things. The technology is simple enough. Don't get too twisted up about it. Whatever your local trusted vendor has will be fine. You're powering a PLC, which may seem high tech and fragile, but my experience has been over the last several decades that they are robust and fairly immune to whatever is thrown at them on the input power end of things.
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Old 07-09-2018, 10:54 AM   #18
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Just dawned on me that you said type and not brand.

I've had fine luck with ordinary standby UPS's, but a line-interactive UPS would be preferred. A lot of the standby UPS's sold these days are actually line interactive UPS's anyhow.
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