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Certification
Variable Frequency Drives


Resources

Related Standard
Product Specific Operations Manual
General Operations Manual



Program Scope
This program applies to Variable Frequency Drives as defined below, for which published ratings are available, and which can be tested in the Independent Third-Party Laboratory contracted by AHRI.

Variable Frequency Drive

A power electronic device that regulates the speed of an alternating current (AC) motor by adjusting the frequency and the voltage of the electrical power supplied to the motor.

Program Scope Inclusions
This certification program includes only base VFDs which may be incorporated into other configurations, (i.e. bypasses, filters, enclosures) with the following specifications:
  • Designed for use in the control of asynchronous induction motors in HVACR products only designated by the manufacturer;
  • Found within a building that are low voltage (= 600 Volts) and drives that are stand alone; and
  • Custom units – designated to have significantly different system efficiencies harmonic performance or motor stress.

Program Scope Exclusions
This certification program does not include:
  • VFDs mechanically integrated into motors;
  • Brushless DC motor controllers; and
  • Motor Insulation Stress for 208 V VFDs.

Certified Ratings
  • Drive System Efficiency, %
  • Motor Insulation Stress, peak V and rise time, µsec; and
  • Power Line Harmonics, total harmonic current distortion, %