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VFD Drive Systems Solutions

VFD drives are modular designed architecture (MDA) and offer the latest control and Power Design on the Market. They are a combination of high reliability, durability, and ease of maintenance. These units are provided both in water-cooled and air-cooled VFD drive systems configuration with a horsepower range of 300 to 2000 HP.  These units can be load shared to achieve capacities up to 6000 HP.  Each Drive system can be fully customizable, engineered, and tested to the customer need. Each unit is front assessable for ease of maintenance and less downtime. We utilize GE ConverTeam VFD technology for its reliability and common spares across existing fleet rigs (Other VFD manufacture Usage can be discussed with MRI Customer Sales Contact).  Multi-use TD/RT VFD drive allows for operator assigning one drive to two functions without cabling or system changes.  


  • Master Rig International manufactures proven VFD drive packages:

Centurion™ VFD Technical Data Platform and Design Layout

  • Full front access cabinets allow for safe and efficient maintenance
  • Modular design architecture (MDA)
  • Fully customizable, engineered & tested
  • Self-diagnosing troubleshooting system with real time supporter
  • Electronic drive health logging and monitoring
  • Profibus and TCP/IP communications compatible for integration into new and existing rig networks
  • HP range of 300-1800HP per drive with load share up to 6000HP
  • Independent DC rectifier per drive (Common DC link Applications Supplied Upon Request)
  • Control software is flexible, with linkable logic blocks
  • Up to 490 configurable parameters for specialized Application, tuning, and controls
  • 160 monitoring parameters
  • Supply voltage: 380V-690V (+/- 10%), 45-65 Hz
  • Cooling: Forced Air cooled or Liquid Cooled
  • Enclosure protection: NEMA type 1
  • Motor control type: Flux vector control without encoder, flux vector control with encoder, VVVF (Frequency) control



SCR Drive Systems Solutions

SCR are also a Combination of high reliability, durability, and ease of maintenance. SCR’s Drive Units have a proven service record of over 20 years in countries around the world.  SCR systems are available in several different models from 500 to 3000 HP.

  • SCR controls and Power Design can be applied to both drawworks, mud pumps, top drive, rotary table, anchor winch and cement pump
    • Automatic drive power phase back
    • Adjustable current limits to control top drive / rotary table torque limits
    • Separate power supply and filter from main bus to each controller
    • Multiple SCR bay load sharing is available


  • Designed for use with series or shunt wound motors
    • Speed or voltage control and load sharing for up to four motors
    • Monitors voltage or current to regulate motor speed


  • Modular design enclosure
    • 120 VAC @ 60Hz control voltage with transient voltage protection
    • Standard 6-Plus gating signal utilizing “hockey puck” SCR’s


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Master Rig International • Phone: 281.931.1118 • Fax: 281.931.1128 • Email: sales@masterrig.com • Terms of Use

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