This part of IEC 61800-9 specifies energy efficiency indicators of power electronics (complete drive modules, CDM), power drive systems (PDS) and motor starters, all used for motor driven equipment. It specifies the methodology for the determination of losses of the complete drive module (CDM), the power drive system (PDS) and the motor system. It defines IE and IES-classes, their limit values and provides test procedures for the classification of the overall losses of the motor system. Furthermore, this part of IEC 61800-9 proposes a methodology for the implementation of the best energy efficiency solution of drive systems. This depends on the architecture of the motor driven system, on the speed/load profile and on the operating points over time of the driven equipment. The methodology of the extended product approach and the semi analytical models are defined in part 1 of the series. The structure of IEC 61800-9-2 is as follows: " the losses of standardized reference PDS (RPDS), standardized CDM (RCDM) and the mathematical model for their calculation are given and classified; " the reference motor (RM) and the reference CDM (RCDM) are defined and can be used to determine the efficiency class of a motor system when one of its constituents is unknown; " the requirements for the determination of the losses of a real PDS and a real CDM are given and compared to the reference RPDS and RCDM; " the requirements for type testing and user documentation; " some exemplary losses of an overall system are illustrated in annexes; " information about system and drive topologies are given in annexes. Specific data for power losses of RCDM, RM, RPDS and IE/IES-classes are given for low voltage (100 V up to and equal to 1 000 V), single axis AC/AC power drive systems with three-phase induction motors. Geared motors shall be treated as standard motors. All provided reference data is derived from PDS with induction motors. It may be used for all types of PDS with other types of motors as well. Servo motor PDSs are usually operated in a completely different method so their energy efficiency indicators will have to be determined differently. They are not included in this standard. The application of this edition of 61800-9-2 to the following equipment may be technically possible but not mandatory: " High voltage CDM and PDS with a rated voltage above 1000 V AC, " Low voltage CDM and PDS with a rated voltage below 100 V AC, " High power PDS above a rated power of 1000 kW, " High power CDM above a rated apparent output power of 1209 kVA, " Low power PDS below a rated power of 0,12 kW, " Low power CDM below a rated power of 0,278 kVA, " CDMs other than those converting electrical AC power into one single AC output, " PDSs other than those converting electrical AC power into one single mechanical rotating shaft, " PDSs and CDMs that being able to regenerate energy back into the AC power supply, " PDSs and CDMs having an input current with a THC (according to the definition in 61000-3-12) of less than 10%, " PDSs that are not put on the market as one single product. NOTE The IEC 61800-9 series does not cover energy efficiency classification of driven equipment but provides input for the assessment of extended product approach.