When the voltage and frequency are within the tolerance range once more, the rectifier and the battery charger switch back on automatically. The rectifier then continues supplying the inverter and the battery charger takes over charging the battery.

5.3.3Bypass 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.

Autom. bypass

RECINV

Power circuit with faulty inverter

 

~

~

Mains

 

 

~

Safety busbar:

 

Load

 

 

Battery charger

Battery

Diagram

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).

Bypass

LineInverter

Battery

The bypass is a mechanical link that switches extremely rapidly. It is located between the load and the mains. The synchronisation unit ensures that the frequency and phase of the inverter voltage is synchronised with the mains.

31