Active Front End - Advanced Harmonic Reduction

Active Front End (AFE) - Advanced Harmonic Reduction Technology

30 hp – 200 hp (22 kW – 149 kW)

460 V

Designed to meet the HVAC industry’s demand for clean power, Control Techniques offers the latest in both microprocessor and power semiconductor technology providing the industry with economical, compact and highly flexible active front end drive packages.

The packages incorporate a Control Techniques H300 dedicated HVAC drive​ and a Unidrive M​ active front end controller. Both variations offer EMC filtering providing extremely low harmonic distortion.

Active Front End package key benefits:

Low Harmonic Distortion

  • IEEE519-1992 harmonic compliance at the drive input terminals
  • Will not interfere with sensitive equipment
  • Not sensitive to line imbalances
  • Superior to 12- and 18-pulse solutions
  • Maintains Unity Power Factor

Easy Installation

  • Available up to 600 hp at 460 V
  • Single package design – no need for external filters or transformers
  • UL508A approved
  • 100 kA SCCR ratings

Flexible Solutions

  • Integrated network connectivity – BACnet, Metasys N2 and Modbus
  • Wide range of I/O and communications option modules including LonWorks
  • Electronic bypass 3 contactor and soft start option

 Active Front End Features

  • Integral Active Front End Controller and EMC filter
  • 100 kA fault rating
  • NEMA 1 enclosure is standard, other enclosure ratings available
  • Optional easy-to-use electronic bypass control (touchpad)


Features Downloads
Key Features:
  • Integrally-mounted 18 pulse auto-transformer
  • Compliance with IEEE-519
  • Keypad
  • LCD display
  • Hand/Off/Auto function
  • Smart card
  • Copy / paste
  • 40°C ambient rating
  • Two built-in PID loops

How to Buy HVACR 

Affinity in 3D 

Control Techniques Energy Saving Estimator 

Harmonic Calculator 

Drives and Energy