Altivar AFE (Active Front End)

Line disturbance/conditions

• THD(i) of less than 4%
• Power factor of cos Phi 1 independent of the load and the energy direction
• Line voltage drops of up to 40% without disturbing operation
• Wide frequency range
• Line short-circuit power up to 100kA

Simple planning and installation
•  Line contactor already integrated
• No external control voltage supply necessary
• Integrated charging circuit providing a maximum fourfold power at the DC bus
• Operation independent of the phase sequence

Energy-saving operation
• Energy regeneration to the line supply
• Improved efficiency thanks to an innovative control system
• No need for damping resistors (which cause heavy losses), thus making it is especially robust in heavily distorted supply voltages
• Reduction of transformer losses, wiring and switching devices

The Active Front End is connected upstream of the standard frequency inverter and consists of three components :
• Active infeed converter - AIC
• Line filter module - LFM (EMC filter, line contactor and charging circuit)
• Line filter choke - LFC (3 parts)

Technical data
• Power range of 120 – 860 kW
• 3-phase 380 - 480V ±10%; 50/60Hz ±5 %
• 3-phase 500 - 525V ±10%; 50Hz ±5 %
• 3-phase 575 - 690V ±10%; 50/60Hz ±5 %
• Built-in unit with protection degree IP00
• Operating temperature from -10°C...+45°C (up to +60°C with derating)

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The Active Front End (AFE) is an option for frequency inverters to return energy to the line supply. It provides 4-quadrant operation and reduces the total current distortion factor THD(i) to a value of less than 4%

The Active Front End is an option for frequency inverters to return energy to the line supply. It provides 4-quadrant operation and thus is ideal for all applications with a generator operating mode. State-of-the-art components, a new control concept, as well as a top-quality filter module all serve to reduce the total current distortion factor THD(i) to a value of less than 4%.

• Crane applications (hoists, long travel motion)
• Downhill conveyors, winches, escalators
• Complex drive systems
• Test benches and high dynamic drives
• Pump/turbine combinations
• Low harmonic drives