Grid condition

Regardless of the set fault responses of the different line faults, the module bus master sends information on the grid condition to other module bus stations (slaves) using the module bus.

The grid condition is only relevant when connecting the module bus slaves. There must be a transition from <Grid OFF> to <Grid OK>. Only then, the slaves are ready to be connected. If there is a line fault or a transition away from <Grid OK> during operation, the slaves do not respond to this information. They respond according to the settings of their own monitoring function.

The power supply module must be able to supply the application using the storage units or another DC source (also external source) if the AC grid has partly or completely failed or if it is not even connected. In this case, the module bus master must not prevent the module bus stations (slaves) from connecting. Parameter "8627.3 Transmit grid information" is available for this purpose. Here, it is possible to set that the grid condition is not transfered, which means the slaves will connect independently of the grid condition.