Delta’s medium voltage drive is a highly-efficient, compact and reliable energy-saving solution. Depending on the demands of different motors and loads, Delta provides general and vector control MVDs, which are extremely versatile in e.g. the power generation, oil & gas, mining, metals, cement and utility industries. MVDs drive medium voltage motors which run, for instance, fans, pumps, compressors, mills, crushers, mixers, and extruders. In addition, MVD’s process control functions can increase production efficiency, reduce energy loss, improve equipment protection, and reduce maintenance cost.

Delta provides customers complete solutions with easy-to-operate variable frequency drives.



Industry Application
Power Generation Forced draft fan, induced draft fan, boiler feed-water pump, cooling water pump, compressor,circulation water pump, compressor, condensator pump
Oil & Gas Gas compressor, electrical submersible pump, pipeline pump, brine pump, feed-water pump
Mining Ventilation fan, baghouse fan, slurry pump, feed pump, gas compressor, blast furnace fan
Metallurgy Forced draft fan (FDF), induced draft fan (IDF), baghouse fan, descaling pump, feed-water pump, booster pump, coiler blast, furnace fan, gas compressor
Cement Kiln IDF, baghouse fan, separator fan, raw mill IDF
Public Facilities FDF, IDF, raw sewage pump, freshwater pump, feed-water pump




Leading Technology

  • Advanced control functions enhance adaptability against instable grid
  • Multi-pulse input rectification reduces input current harmonic distortion, meeting IEEE 519-1992
  • Advanced drive concept provides multilevel output voltages and enhanced motor operation


Protection Features

  • Over current
  • Over load
  • Transformer over temperature
  • MVD over temperature
  • Under voltage / over voltage
  • Motor overload (external)
  • Blower fault
  • High voltage cabinet door open
  • Cabinet air pressure abnormal
  • Output short circuit
  • Input / output phase loss
  • Communication fault
  • Output fault to ground


Enhanced Process & Quality Control

  • Built-in proportional integral differential (PID) controller enhances control of process variables such as flow and pressure
  • Ride through and flying start features ensure a more continuous process in spite of input voltage dips
  • Friendly user interface provideeasy-to-use system integration


Control & Monitoring Features

  • Frequency reference (Hz)
  • Actual frequency (Hz)
  • Input / output power / current / voltage
  • Cumulative operating hours
  • Drive status
  • Status of system bypass switches and MCB
  • Analog inputs / outputs monitoring
  • Fault / Alert messages
  • Fault diagnosis function
  • Ride-through and flying start functions


Lower cost of ownership

  • System efficiency is more than 98.5% (without phase-shifted transformer)
  • Optimized pump and fan operation ensure significant energy savings and short return on investment
  • Integrated transformer enables a three-cable-in-three-cableout installation concept using considerably less engineering effort
  • Reduced mechanical stresses eliminate hammer effect in pipelines and vent ducts, and lowers maintenance cost
  • Multilevel voltages and motor soft start minimize stresses



Delta MVD1000 is easy to operate and maintain, and offers special features for integration into a broad range of applications.




Input Frequency 50Hz/60Hz (-5%~+5%)
Control Power AC380V (three-phase four-wire) or AC220V, 3kVA
Input current distortion <5% (at rated speed and load, complying with IEEE 519)
Power factor >0.96 (at rated speed and load)
Efficiency >98% (at rated frequency and load, excluding transformer)
Frequency range 0~75Hz
Frequency resolution 0.01Hz
Overload capacity 120% for 1 min every 10 min; 150% stop immediately 
PID function Built-in PID regulator with configurable parameters
Modulation method SPWM/SVPWM
Speed acceleration & deceleration time 0~3000s (configurable)
Function configuration Torque boost, frequency skipping, automatic voltage regulation, failure diagnosis, flying start,system bypass, ride through, multipoint V/F control, power cell bypass (optional), space heater synchronous transfer switch (optional)
Analog inputs 0~10V / 4~20mA 2 channels (expandable)
Analog outputs 0~10V / 4~20mA 4 channels (expandable)
Digital I/Os 10 digital inputs and 8 digital outputs (expandable) Communication interface
Communication interface Isolated RS485, Industrial Ethernet (optional), GPRS (optional) Communication protocol, MODBUS, PROFBUS, Others
Operating temperature -5℃ to +40℃ (normal operation)
Storage/transportation temperature -40℃ to +70℃
Relative humidity 5% to 95%, non condensating
Altitude <1000m (normal operation), derated use at higher altitude
Cooling Forced air cooling
Protection level IP30 (standard) others can be customized
Regulations and certification IEC, IEEE, GB, CE, GOST


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