UPS 3750 Voltage

Hello

I suggest reviewing documentation. I think this is the support page for the UPS.

https://www.dell.com/support/home/product-support/product/dell-online-rack-ups-3750r/research

As long as the input is the appropriate type, AC or DC, and is providing voltage and amperage that is within supported specifications then it should work.

Thanks

I actually just figured out how to do it through the front panel.  I was confused how to actually get into the menus there.   I was able to change the output voltage from 208 to autosense and everything seems to be peachy now.  The units (I actually have 2) are happily running alarm free in bypass mode. 

I did actually read the manual, that's where I got the number for max voltage I mentioned.  

Nowhere in the manual(s) did I find it mention anything about setting input voltage thresholds like I can do with my APC units.  I am not very familiar with these dell units and did not originally set them up.  

What I found when I powered the unit up with 240VAC is that they will not go to bypass mode.  The input voltage is too high.  The output still works fine, however it is regulated down to 208.  It would be nice if there were settings somewhere I could change.

I did find the pinout for the serial cable I think, maybe config is there?

Youre using an old Dell (Eaton based) 3750 Watt UPS which goes end of sale 4 years ago.  We have 3 dozen of them left in production and they all run on 230V here.

Regards,
Joerg

Hello,

I know this is an older thread but I was hoping someone might still be able to answer a question for me.

Can anyone tell me if these could be used in a residential environment using either 120v or 220v (which is actually 240v)?

I greatly appreciate any information!

-Sam

It works just fine.  Make sure you don't have any loads connected when you power it in. You will need to go into the menus and set the correct input and output voltage and tolerances.

I have had 2 running perfectly on 240v single phase since I started this post.  I recently acquired 2 more that I plan to hook up the same way. 

Why do you say that? 

Genuinely curious, as they are well within their ratings.  I realize it's not a "standard" installation, but we aren't running anything out of spec. 

Hello, I would highly advise AGAINST it. Good chance of fire.

OK.... Pg63 doesn't have any useful information.

"because I said so" doesn't mean . TOS76>

.  Just because it's not an "approved" installation, doesn't automatically mean it's a safety hazard.  If you look at the speciations/ratings of the equipment, and have half a brain to interpret them, there should be no adverse effect running on 240v single phase.  It is not explicitly prohibited.  If it were so dangerous, why is it not called out as such in the documentation? 

It is possible to use but I would still say it's risky and if you don't use the right model it could be damaging to UPS and could lead to fire.

chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://dell.to/3hT9MpC

Dell Online Rack UPS 3750W and 4200W User's Guide
If you look at page 63, table 9 , UPS model list, they are all different.

I just clicked the link you provided.  Am I missing something or did you provide the wrong link?  You stated to go to page 63 but the documentation you sent is only 53 pages total - LOL!  

Again, I appreciate any and all info!

-Sam

Holy cow!  That was the fastest response I ever got!  Not even my wife responds to me that fast - Ha! Ha!

I really appreciate your feedback and appreciate your info regarding the safety concerns.

-Sam

I really appreciate all the feedback/information!  

ADK_mechetech... If you don't mind me asking, what are you powering with your units?

DELL-Young E... I appreciate your concerns as well.  I'm looking into the documentation you sent now.

Thanks again!
-Sam

So, I have a rack in my basement at my house.  It holds my Mon$ter Power Conditioner - AVS2000 which feeds power to my security camera DVR, switch, POE injector for sec cams, modem and router.  I've been using some smaller rack mount UPS's to keep my setup running during power outages.  I had a few Dell battery backups at my office that I wasn't using.  So I planned on swapping out my existing ones since they're old and need new batteries anyway.  My only goal is to extend the runtime of my equipment during power outages (which unfortunately happens all too often where I'm at).  All that being said, there shouldn't be any issues running any of the items I mentioned, right?  

I plan on hooking up a power meter tonight to see what all the above equipment draws.  Once I do that I should be able to know with a good approximation how long my rack would stay powered up, right?

Thanks again!

-Sam

PS.  When I tried submitting this reply I got an error message "The message body contains Mon$ter, which is not permitted in this community. Please remove this content before sending your post."  Of course I had to substitute the "S" with "$" - LOL!  So, we're not allowed to mention another companies name on this forum or just that word in a derogatory manner?

Power connect switch, an r720, and 2 r620.