Figure 3 – 1LHX Series Block Diagram
FEATURES
Low Line Side Harmonics (IEEE 519-2014 Compliant) – 1LHX & 3LHX Models Only
All models of the LHX series employ active front end (AFE) technology. Active switching of the input IGBTs
allows the drive to draw the input current as a sine wave, greatly reducing the current distortion and line
harmonics associated with a diode bridge rectifier. Because of its favorable harmonic profile, additional input
line reactors and harmonic filters are NOT REQUIRED on the line side of the drive. Installations at 80% load
or greater will comply with IEEE 519, the international standard for allowable harmonic distortion on utility
mains.
Voltage Doubling
The input module of DXL and LHX drives is capable of significantly boosting the voltage on the DC bus.
Utilizing this feature, some models of the series convert 230 V single-phase or 230 V three phase line voltage
to 460 V three-phase output.
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