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Variable Frequency Drive Triol AT27

Medium-voltage Variable Frequency Drives Triol AT27 are designed for automatic control of a wide range of industrial systems with induction, synchronous (with an external exciting system) and Permanent Magnet Motors.  

Variable Frequency Drives Triol AT27 have extensive motor control functionality and covers a large power range to operate with pumps, fans, compressors, mills, crushers, conveyors, extruders, mixers, etc.

Variable Frequency Drive Triol AT27 offers wide sets of functions and unique algorithms for high-quality control of motors. Implementation of Variable Frequency Drive Triol AT27 provides increased reliability of equipment operation, reduced productivity and energy savings. Innovative technical solutions in the field of transformer design, cooling systems and intelligent algorithms development guarantee a non-stop operation of equipment minimizing the costs.

Triol AT27 VFD is an adaptive solution compatible with any environmental conditions and the best option that ensures a long-term operation. 

AT27 series is represented by 3 lines, each of which was created for different climatic conditions: from comfortable conditions of electrical rooms to extreme conditions of hot deserts and Arctic colds, for maritime climate and installing in metallurgical plants.



Investment Savings

  • No construction and ventilation system required
  • No additional power transformers needed
  • Operation with any motor
  • IEEE 519 compliance
  • One VFD covers control process for several motor and programmable logic controller (PLC)
  • Small footprint

Energy and resource savings

  • Reduced energy consumption
  • Process optimization 

Maximization of production

  • Voltage sags protection
  • No shutdowns due to Triol AT27 VFD failure
  • Automatic restart
  • Quick replacemen
  • Unlimited motor start
  • Unloading time savings (mills, mixers, extruders)
  • Completing the plan
  • System redundancy


Reduced installation and operating costs


  • Low cost with an extended lifetime
  • Easy setup and monitoring
  • Increased motor overhaul cycles and processing equipment
  • Minimum installation work
  • Standard shipping
  • No need for a large storage room


  • A method of a magnetic circuit manufacturing. Application for invention 2018105859 of 02/16/2018 – based on this invention, our company develops and manufactures transformers of TRSD series used in Triol AT27 VFDs.
  • High-speed switching device. Application for invention 2018101494 dated 1/16/2018 – this invention underlies the mechanical bypass of the power cells and ensures the smooth operation of the AT27 in the most demanding applications in the event of a failure of the inverter part of the power cell.
  • Device and method of high voltage measuring. Application for the invention №2018122866 from 06/23/2018 – the device for high voltage measuring, invented by the company, made it possible to abandon large and heavy voltage transformers and, accordingly, reduced the size of our VFDs.

Key Features

Line ED


  • Cabinet type
  • Enclosure protection class is IP31
  • Operating temperature –1…+40°C (33.8…104°F)
  • Common industrial application (pumps, fans, exhausters, compressors, mills, conveyors, extruders)

Line RX


  • Block-box type
  • Enclosure protection class is IP43
  • Operating temperature –60…+40°C (–76…104°F)
  • Common industrial application (pumps, fans, exhausters, compressors, mills, conveyors, extruders)
Line MV

Might of Voltage

  • Cabinet type
  • Enclosure protection class is IP65 with a dual-circuit cooling system
  • Operating temperature –10…+60°C or –60…+40°C (14…140°F or –76…104°F)
  • Common industrial application (pumps, fans, exhausters, compressors, mills, conveyors, extruders


  • ISO 9001:2015 Quality management systems – Requirements
  • EN 61140 Protection against electric shock – Common aspects for installation and equipment