we had a lot of trouble with those UPS devices, especially if they are cheap ones & if they are connected to non-dedicated outlets that supply power to other items on same floor or throughout building.
some of these large UPS units have a cycle that creates line noise, that would wreck havoc on certain Printers {CLC's & some iRC's) causing false Error codes/Jam codes.
make sure they are not using a power strip from outlet to this UPS/
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