Hopefully someone can help me, I've spent hours searching the internet for a solution to no avail. I'm looking for Uninterruptible Power Supplies that can be connected in parallel for best redundancy to protect a DCS panel. I'm aware that there are many UPSs that support the N+1 or N+X systems for the power cells, but still use only a single controller. However, we've seen problems in the past where the controllers malfunction on a UPS and, as a result, it failed to back up the systems regardless of any redundant power cells. Therefore, two distinct systems (with separate controllers) with the ability to be connected in parallel (ie. 1+1 setup) is definitely the setup I'm looking for, but, as expected, their outputs need to be phase locked. Specifics of what I'm looking for are as follows:
Input: 120V AC or 208V AC, 60Hz (common supply to both units) Output: 120V AC, 60Hz Power: 2300W < Output Power < 3300W (for each unit) Mount: preferably tower/floor standing, but 19" rack mount if nothing else is ok. Electrical bypass: preferable for maintenance and replacement of UPSs
If there are no UPS systems specifically designed for this setup, is there any kind of interface that can be used to phase lock the individual outputs of two identical UPS units?
I'm hoping someone can help me in my search. Any help at all would be greatly, greatly appreciated.
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