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The LED bargraph (LED chain on the left hand side of the ON
/ OFF button) show during operation the actual utilization of
the UPS (chapter 8.1.1, page 45 ff).
6.1.3 Bypass Operation
If the inverter is overloaded or if overtemperature is detected,
e.g. also if an inverter defect is detected, voltage is supplied
to the load via the bypass that switches on automatically. This
is signalled by the bypass symbol.
This function is also referred to as passive redundancy. It
protects against total failure of the voltage supply on the
protected busbar, however in the operating status that is now
attained, mains faults would have a direct effect on the load.