Medium Voltage VFD (Inverter)

High Reliability & Performance / Compact / Energy Saving

LSIS medium voltage drive consists of compact integrated systems built on cutting-edge technologies, delivering optimum energy-saving solution featuring high efficiency and power factor. The system supports a user-friendly HMI(Human Machine Interface) that allows easy operation and displays desired information for customers maximum convenience. LSIS medium voltage drive offers leading industrial drive solutions with proven reliability and economic viability. It also contributes to energy saving and environment protection in various industries including gas, water treatment, marine, power generation, and cement.


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Improved Power Quality

Improved Input Power Quality and THD (Total Harmonic Distortion) by Adopting Multi-winding Phase-shift Transformer

  • Application of extended delta-type transformer and separated-type multi-pulse rectifier drastically reduces input power THD, hence complying with IEEE-519 standard.
  • Input current almost identical to sine waves eliminates need for additional harmonic filters or active filters on the input side.
  • Producing Multilevel PWM-type Sinusoidal Output

  • Compatible with conventional motors and cables to ensure it fits in with existing system design.
  • Minimal impact of voltage reflection, allowing longer cable length between drive and motor.
  • Medium voltage drives minimize mechanical stress on motor, eliminating need for additional sine wave filters.
  • Energy Saving

    Achieving Energy Saving and Minimum Energy Loss through Optimized Speed Control

    Guaranteeing High Operating Efficiency and Power Factor

  • Delivering a high power factor at 95% or above with an independent built-in system without additional power factor corrector.
  • Improving system efficiency with a drive-only system configuration without input/output filters.
  • Compact Design

    Cell Bypass Function

    Automatically bypass of failed cells if cells connected in series randomly fail during operation,
allowing continuous operation.

    Flying Start

    Automatically estimates speed of the rotating motor to reach the frequency without any system failure(trip)

    Ride-through Capability

    Mechanical energy of load is regenerated to continue operation for up to 5 cycles when power outage occurs. It allows continuous operation without stopping the drive or system.

    Synchronous Transfer Function

    Switching motor power from medium voltage drive to commercial power (bypass mode) or vice versa (drive mode)

    User Convenience

    Standard HD HMI Monitoring Maximizes User Convenience


  • Standard built-in PLC supports customization (I/O extensibility, etc.)
  • Providing the improved system compatibility with field-bus communication options (Profibus, DeviceNet, Modbus, Metasys N2, LS BUS(RS485)

  • LSMV-M1000

    Voltage: 3kV/4kV/6kV/10kV/11kV
    Capacity: 200kVA~12,500kVA
    Control Mode: V/F, Sensorless Vector
    IP Class: Standard IP21 (~IP42 Optional)
    Standards: CE, UL(Pending)
    Frequency: 50/60Hz


    Voltage: 3kV/6kV
    Capacity: 200kVA~1,200kVA
    Control Mode: V/F, Sensorless Vector
    IP Class: Standard IP21 (~IP42 Optional)
    Standards: CE, UL(Pending)
    Frequency: 50/60Hz