3A225Frequency changers or generators, other than those specified in 0B001.b.13., usable as a variable or fixed frequency motor drive, having all of the following characteristics:

N.B.1.
"Software" specially designed to enhance or release the performance of a frequency changer or generator to meet the characteristics of 3A225 is specified in 3D225.
N.B.2.
"Technology" in the form of codes or keys to enhance or release the performance of a frequency changer or generator to meet the characteristics of 3A225 is specified in 3E225.
a. Multiphase output providing a power of 40 VA or greater;
b. Operating at a frequency of 600 Hz or more; and
c. Frequency control better (less) than 0,2 %.
Note:
3A225 does not control frequency changers or generators if they have hardware, "software" or "technology" constraints that limit the performance to less than that specified above, provided they meet any of the following:
1. They need to be returned to the original manufacturer to make the enhancements or release the constraints;
2. They require "software" as specified in 3D225 to enhance or release the performance to meet the characteristics of 3A225;
or
3. They require "technology" in the form of keys or codes as specified in 3E225 to enhance or release the performance to meet the characteristics of 3A225.
Technical Notes:
1. Frequency changers in 3A225 are also known as converters or inverters.
2. Frequency changers in 3A225 may be marketed as Generators, Electronic Test Equipment, AC Power Supplies, Variable Speed Motors Drives, Variable Speed Drives (VSDs), Variable Frequency Drives (VFDs), Adjustable Frequency Drives (AFDs), or Adjustable Speed Drives (ASDs).