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This so-called passive redundancy protects against the total
failure of the voltage supply on the secured busbar; however,
in this operating mode, mains faults would directly affect the
load. As a result, the electronics continuously attempt to
switch back to "online" / normal operating mode (e.g. when
the overload or overtemperature goes away).
The bypass consists of an inverse-parallel thyristor stack and
functions as an extremely rapidly switching link between a
load and the mains. The synchronization unit ensures that the
frequency and phase of the inverter voltage is synchronized
with the mains and can therefore be switched over without
interruption (within the tolerance limits).
i
The bar graph LED functions as the display of
the UPS capacity utilisation. The acoustic signal
sounds every 2 seconds during this operating
mode.
6.1.4 Manual Bypass