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myannes
Participant

Join Date: May 2007
Posts: 1

UPS alarm Loss Of Redundancy

05/24/2007 2:10 AM

Hi All,

I have a problem in my UPS at my office, My UPS have capacity 250 Kva with Redudancy System (1+1), if Main Source failed and then ON about 5 second., In my ups appears alarm Loss Of Redundancy about 10 second then disappear. I wanna ask u guys, what's meaning of "Loss Of Redundancy", How this alarm appear. thx
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INCOBAR
Active Contributor

Join Date: May 2007
Posts: 10
#1

Re: UPS alarm Loss Of Redundancy

05/25/2007 12:38 AM

This happens when two ups are conected in series, when energy goes off, the first ups switchs to battery, so redundancy is not anymore, and that situation exists until power comes back, usually restores after several seconds later.

This is configuration is called serial redundancy, different than parallel or tie configuration, or parallelism...
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Haajee
Guru

Join Date: Feb 2006
Posts: 1758
Good Answers: 6
#2

Re: UPS alarm Loss Of Redundancy

05/25/2007 4:36 PM

You have 2 Modules of 250KVA each & your load is <250KVA for which the system you have. "Redundancy" means at least Power-Module is surplus to your requirement.

If you have 3 Power-Modules then your load should not exceed 500KVA if you need

"Redundancy" [additional] to full load requirements.

When one of the modules fail your redundancy is lost that means if another fails in due time your system will switch to "By-Pass" i.e. Mains Power. Now you will not have UPS facility & your system will have no power if Mains fails in due-course.

""Redudancy"" is incorrect, "Redundancy" is the correct spellings.
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