Features

• Altivar AC Line Choke. A line choke can be ***d to provide improved protection against overvoltages on the line supply and to reduce the current harmonics produced by the drive. The recomm***ed chokes can be ***d to limit the line current. They have been developed in line with standard EN 50178 (VDE 0160 level 1 high energy overvoltages on the line supply). The inductance values are defined for a voltage drop between phases of between 3% and 5% of the nominal line voltage. Values higher than this will ca*** loss of torque. These chokes should be installed upstream of the drive. The *** of line chokes is recomm***ed in particular under the following circumstances: Close connection of several drives in parallel Line supply with significant disturbance from other equipment (interference, overvoltages) Line supply with voltage imbalance between phases above 1.8% of the nominal voltage Drive supplied by a line with very low impedance (in the vicinity of a power transformer 10 times more powerful than the drive rating) Installation of a large number of frequency converters on the same line Reduction of overload in cos Ø correction capacitors, if the installation has a power factor correction unit