Active Line Modules are self-commutated rectifier/regenerative units (with IGBTs in rectifier and regenerative directions) and generate a regulated DC link voltage. This means that the connected Motor Modules are decoupled from the line voltage. Line voltage fluctuations within the permissible supply tolerances have no effect on the motor voltage. Active Line Modules are designed for connection to grounded, star (TN, TT) and non-grounded, symmetrical IT supply systems.

The DC link is pre-charged by means of integrated pre-charging resistors.

In order to operate an Active Line Module, it is absolutely essential to use the appropriate Active Interface Module or matching HFD line reactor.