DIN EN IEC 60034-9
; VDE 0530-9:2025-09
Rotating electrical machines - Part 9: Noise limits (IEC 60034-9:2021); German version EN IEC 60034-9:2024
Drehende elektrische Maschinen - Teil 9: Geräuschgrenzwerte (IEC 60034-9:2021); Deutsche Fassung EN IEC 60034-9:2024
Overview
This part of IEC 60034 specifies test methods for the determination of sound power level of rotating electrical machines and specifies maximum A-weighted sound power levels for factory acceptance testing of network-supplied, rotating electrical machines in accordance with lEC 60034-1, having methods of cooling according to lEC 60034-6 and degrees of protection according to lEC 60034-5. The rotating electrical machines shall be designed without additional special electrical, mechanical, or acoustic modifications intended to reduce the sound power level. Their rated power shall be in the range from 1 kW up to and including 5 500 kW, and their rated speed shall not exceed 3 750 min-1. This part of the series of standards does not apply to noise limits for AC motors with inverter power supply. The standard differs from DIN EN 60034-9 (VDE 0530-9):2008-01 and DIN EN 60034-9 Corrigendum 1 (VDE 0530-9 Corrigendum 1):2008-04 as follows: a) in Table 2 and Table 3 cooling methods IC01, IC11, IC21 and IC31, IC71, IC81 are now covered; b) this edition adds Table 3 for 60 Hz machines, whereas Table 2, which covers only 50 Hz machines, has no change in levels; c) in Table 3, grade A is added to harmonize the highest levels seen in IEC and NEMA, whereas grade B was added to harmonize the lowest, more restrictive levels seen in IEC and NEMA; d) The clause "Determination of noise increments caused by converter supply" has been shifted to Annex B and renamed "Information on typical noise increments caused by converter supply". The object of this document is to determine maximum A-weighted sound power levels, LWA in decibels, dB, for airborne noise emitted by rotating electrical machines of standard design, as a function of power, speed and load, and to specify the method of measurement and the test conditions appropriate for the determination of the sound power level of the machines to provide a standardized evaluation of machine noise up to the maximum specified sound power levels.
