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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.
As a result, the electronics continuously attempt to switch back to "online"
/ normal operating status (e.g. when the overload or overtemperature no
longer applies).
The bypass is a mechanical link that switches extremely rapidly. It is
located between the load and the mains. The associated synchronization
unit in the bypass ensures that the frequency and phase of the inverter
voltage is synchronized with the mains.
5.1.4
Manual bypass
The manual bypass allows maintenance and service personnel to work on
the Protect C without switching of the appliance.
If the mains supply fails if the manual bypass is activated, the loads supply
fails completely. For this reason, it is important to switch as fast as
possible to normal operation mode.
5.1.5
Unit overload
The load on the UPS should never exceed the specified rated load of the
unit. If a unit overload occurs nevertheless (from 105% of the specified
unit rated load) the fault LED is turned on accompanied with a signal tone
(twice per second). The connected loads continue to be supplied for a
certain time depending on the level of the overload. However, the
connected load must be reduced without delay.
Non-observance of the "Unit overload" condition may cause
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