Reference models and PDS calculations
Motor and drive manufacturers determine the IE or IES classifications for their products. The standard provides reference models for a load/motor “RM”, the CDM, “RCDM” and PDS, “RPDS.”
The reference models provide a way for manufacturers who may only produce the motor or only the drive to still provide IES values for selected combinations of products.
Manufacturers (like ABB) who produce both the motors and drives can measure or calculate the IES values without having to use the reference models.