Sinusoidal Filters
SFAF2-400
High performance Sinusoidal Outputfilter three-phase from 2 – 600 A
Rated voltage 400 V (also 500 V / 690 V available)
Recommended for frequency inverter operation with long motor cables
Generates sinusoidal output voltage
VFD-operation with unshielded motor cable is possible
Reduces motor noise
Protects motor windings and bearings
Reduces the dv/dt values (spikes)
Reduction of high-frequency leakage currents
Improves the EMC (reduced emissions of interference)
UL approved insulation material
Even 4-line sinusoidal filters available
SFAF2-500
High performance Sinusoidal Outputfilter three-phase from 200 – 1200 A
Rated voltage 500 V
Recommended for frequency inverter operation with long motor cables
Generates sinusoidal output voltage
VFD-operation with unshielded motor cable is possible
Reduces motor noise
Protects motor windings and bearings
Reduces the dv/dt values (spikes)
Reduction of high-frequency leakage currents
Improves the EMC (reduced emissions of interference)
UL approved insulation material
Even 4-line sinusoidal filters available
Use of sinusoidal filters on the frequency inverter output
Sinusoidal filters can be connected between inverter output and motor. Especially with long motor cables sinusoidal
filters should be used to reduce parasitic capacities of the motor cable. If a suitable dimensioning of the LC filter,
the pulse-width modulated (PWM) inverter output voltage is converted into a sinusoidal voltage.
Not only emissions on the motor cables are significantly attenuated, but also the voltage peaks which are caused by the inverter
switching frequency. In addition to improved EMC the moptor is spared thus achieving a reliable and durable performance.
Comparison motor voltage (phase-phase) without sinusoidal filter and with sinusoidal filter
Example of the connection:
Inverter – Sinusoidal Filter – Motor