SINAMICS DC MASTER applications are in compliance with the EMC product standard EN 61800-3 for electric drives when taking into account that the units are integrated into the plant or system in compliance with EMC rules.

However, EMC legislation does stipulate that the plant or system as a whole must be electromagnetically compatible with its environment.

If radio interference suppression level "A1" according to EN 55011 is to be achieved, then in addition to the commutating reactors, radio interference suppression filters are also required. Radio interference suppression filters reduce radio interference voltages of the converter that occur in conjunction with the commutating reactor.

Radio interference suppression filters generate leakage currents. In accordance with DIN VDE 0160, a PE connection with a cross-section of 10 mm² is required. For the filters to have optimum effect, it is absolutely essential that they and the unit are installed on a single metal plate.

For converter units with three-phase connection, the minimum rated filter current is equal to the DC output current of the unit times 0.82. For a two-phase connection (field power section or single-phase connection of the armature power section) only two phases are connected to the three-phase radio interference suppression filter. In this case, the line current is equal to the field DC current.

List of the recommended radio interference suppression filters from EPCOS