VMaster Variable Speed Fan Drives with Digital Interface Control

vmaster di

Variable Speed Fan Drives and Digital Controllers

VMaster Di is a reliable system that provides variable-speed fan control specifically tailored to your engine cooling requirements. VMaster Di combines the proven Veritas variable speed fan drive with a programmable digital controller that translates fan percent speed command signals from the engine ECM to a control signal for the fan drive.

J1939 compatible, VMaster Di is a plug-and-play system that keeps your engine at optimal operating temperature while reducing operating noise, saving fuel and increasing performance. The VMaster Di system also increases available horsepower for auxiliary components. This maintenance-free system is engineered to turn any 20-inch [508 mm] to 44-inch [1118 mm] plastic, metal or composite fans.


  • Reduces noise and saves fuel
  • Optimized cooling under all conditions
  • Better performance
  • Increased available horsepower for auxiliary components
  • More economical and safer than hydraulic systems


  • Variable-speed control
  • Customized algorithms for specific requirements
  • J1939 compatible
  • 12V/24V
  • Integral diagnostics
  • 70 percent fan speed override to meet the European noise directive
  • 105C temperature rating
  • Maintenance-free
  • Compatible with a wide range of fan sizes


  • Skid steers
  • Truck cranes
  • Cement trucks
  • Refuse trucks
  • Medium-duty day cab class 7 – 4 trucks
  • Power generators
  • Other on- and off-highway

Related Products

  • Stratis Viscous Fan Drives
  • Stratis Di Viscous Fan Drives and Controllers
  • VMaster® Air-Sensing Fan Drives
  • VMaster Directly Controlled Fan Drives
  • WindMaster Fans


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