Medium Voltage Drives

Medium Voltage Drives
Medium Voltage Drives
Medium Voltage Drives
Medium Voltage Drives

M2L Medium Voltage Variable Frequency Drives


The M2L’s architecture differs radically from other multi-level systems in the market today. The drive consists of three independent components:

  • Standard multi-pulse phase-shifting transformer
  • Standard multi-pulse diode-based rectifier
  • Modular-power cell-based multi-level inverter

This design makes a common bank of capacitors for energy storage and filtering unnecessary, and eliminates the need for multiple rectifier-capacitor combinations in individual inverter power modules. DC power is fed to the M2L inverter from a standard transformer – which can be located remotely from the inverter – via bridge rectifiers. Power is provided to the DC link as a whole via the DC voltage terminals, not individually fed to each module. Link energy storage is distributed among identical power modules that comprise the M2L inverter rather than relying capacitors for energy storage. This arrangement greatly reduces arc flash potential and substantially improves reliability.  

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The M2L inverter generates multi-level voltage waveforms (13 levels for 4,160 V output) and motor-friendly sinusoidal currents on the output side. The low dV/dt of the voltage waveforms make M2L MV drive a perfect solution for long-cable applications. The superior output waveforms eliminate any need for additional filtering or inverter duty motors.
The M2L inverter delivers efficiency of ~99% throughout its speed and power range. Power loss from drive operation less than 3%, which includes cooling fans and control power as well as the power loss in the input transformer, rectifier, and inverter.
The M2L design reduces both the number of components and connections compared to other technologies, reducing the number of potential points of failure. Reliability is further enhanced by the use of highly-dependable components, including LV IGBTs and film capacitors in the power-cell-based inverter. 
The M2L’s modularity speeds and simplifies almost all service-related activities. This modularity provides the easiest, fastest power-cell replacement possible, with a mean-time-to-repair for replacement of less than 15 minutes. 
Installation flexibility is provided by the unique system topology, with separate transformer, rectifier and inverter. Users can opt to install the transformer (NEMA 3R or oil-filled) or transformer and rectifier (NEMA 3R) sections outside the facility. Locating components outside creates the opportunity for significant financial and safety benefits:
  • Smaller E-house, with a size and weight reduction of ~50%
  • Smaller HVAC tonnage capacity, as much as 65% less
  • Smaller arc flash boundary and footprint, with a lower short-circuit rating
The M2LMV drive significantly improves safety in three ways for people working on or around the equipment:
  • Reduces the short-circuit current available at indoor equipment terminals (outdoor transformer)
  • Reduces the stored energy available at each possible point of failure (modular power-cell based)
  • Reduces the reaction time to any possible fault (advanced arc flash detection system)
The M2L drive utilizes the latest technology to provide an advanced, customizable and user-friendly process and human interface. The HMI touch-screen can be installed locally on the inverter section, locally or remotely on a separate LV box, or remotely as part of process-control panels.
Every M2L MV drive comes with Benshaw’s intuitive PC-based software, Benshaw Connect. In addition to typical configuration, monitoring and troubleshooting features, Benshaw Connect provides access to the operational data logs as well as advanced graphical capabilities to create and monitor parameter trends and waveforms.
The M2L MV drive is equipped with advanced GMC® remote monitoring system which allows operator to remotely access and monitor operational and health conditions of drive system. Advanced diagnostics and customizable alarm technology advise quality issues or failure before they occur thus providing best-in-class service and minimizing any probable down-time.