ANNEX IISupplementary provisions
ANNEX II MEASUREMENT METHODS AND CALCULATIONS For the purposes of compliance and verification of compliance with the requirements of this Regulation, measurements and calculations shall be made using harmonised standards the reference numbers of which have been published for this purpose in the Official Journal of the European Union, or other reliable, accurate and reproducible methods, which take into account the generally recognised state-of-the-art, and in line with the following provisions: 1. FOR MOTORS The difference between the output mechanical power and the input electrical power is due to losses occurring in the motor. Total losses shall be determined using the following methods, based on a 25 °C reference ambient temperature: — Single-phase motors: Direct measurement: Input-Output; — Three-phase motors: Summation of losses: Residual losses. For 60 Hz motors, equivalent values of the rated output power (P N ) and rated voltage (U N ) for the 50 Hz operation shall be calculated based on the values applicable at 60 Hz. 2. FOR VARIABLE SPEED DRIVES For the determination of the IE class, the power losses of VSDs shall be determined at 100 % rated torque-producing current and 90 % rated motor stator frequency. The losses shall be determined according to one of the following methods: — the input-output method; or — the calorimetric method. The test switching frequency shall be 4 kHz until 111 kVA (90 kW) and 2 kHz above, or at the default factory settings as defined by the manufacturer. It is acceptable to measure VSD losses at a frequency of up to 12 Hz instead of zero. Manufacturers or their authorised representatives can also use the single loss determination method. Calculations have to be performed with respect to component manufacturer’s data with typical values of power semiconductors at the actual VSD operating temperature or at the maximum operating temperature specified in the datasheet. When no component manufacturer data is available, losses shall be determined by measurement. Combination of calculated and measured losses are allowed. The different individual losses are calculated or measured separately and the total losses are determined as the sum of all individual losses.