Part2 inverter and motor drive

Part2 inverter and motor drive

System hierarchy

IEC61800-9 defines the efficiency level (referred to as the powertrain or PDS in the standard) for AC drives and motor drive systems.

About the AC drive The standard defines three levels: IE0, IE1 and IE2. Each power size defines a reference value. This reference value corresponds to the IE1 level. If the drive loss exceeds 25% of the reference value, it will be classified as IE0. If the loss is at least 25% below the reference value, it will be classified as IE2. The IE level of the AC drive is determined at a single operating point of 100% current and 90% output frequency.

All Danfoss drives (VLT® and VACON® series) are IE2 rated.

There are also three grades for motor drive systems: IES0, IES1 and IES2. The "S" after "IE" stands for "System". IES1 is the reference level. Unlike the frequency converter, the “width” of the rating is +/- 20% for the system. This means that if the loss is less than 20% of the reference value, then the level becomes IES2. The IES rating is determined at rated load and rated speed (100%/100%)

For inverters and motors from two different manufacturers, to know the IES rating of their combination, a simple calculation is needed to obtain: the loss of the motor must be added to the loss of the frequency converter, and then it will be obtained. The sum of the comparisons is compared to the reference value.

To simplify the combination of Danfoss drives with any induction motor, Danfoss has developed a calculation tool that can perform related calculations for you and even generate a certificate. The name of the tool is called DanfossEcoSmart. Available via ecosmart.danfoss.com or as an app from the Apple Store and Google Play.