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There are two operation modes possible:
• Redundant system: As long as both UPS do not exceed the level of 50 % load
one UPS is able to take over the full load if one of the UPS in the system fails.
After the failed UPS was repaired it can be restarted and will recover the redun-
dancy condition. In case of more than 50 % load per UPS the system will gener-
ate an alarm. In case one UPS fails at more than 50 % load per UPS the second
UPS will take over and will run into overload. It will supply the load according to
the UPS overload capability. After that condition both UPS will switch to bypass.
• Parallel system for power enhancement: Paralleling two UPS will double the
maximum power. There will be no alarm “Redundancy lost”.