IEC 60034-9-2007 Rotating electrical machines - Part 9: Noise limits

Language: English, French
International Standard IEC 60034-9 has been prepared by IEC technical committee 2: Rotating machinery.
This edition includes the following significant technical changes:
this edition reduces the no-load noise limits for single-speed, cage-induction motors according to Table 2;
it also provides informative guidance on
– the measurement surface to be used during some tests,
– a method for the determination of an average sound pressure level,
– an indication of “uncertainty” based upon the category of test procedure.
This consolidated version of IEC 60034-9 consists of the fourth edition (2003) [documents 2/1256/FDIS and 2/1272/RVD] and its amendment 1 (2007) [documents 2/1383/CDV and 2/1413/RVC].
The technical content is therefore identical to the base edition and its amendment(s) and has been prepared for user convenience.
It bears the edition number 4.1.
A vertical line in the margin shows where the base publication has been modified by amendment 1.Scope
This part of IEC 60034:
– specifies test methods for the determination of sound power level of rotating electrical machines;
– 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, and having the following characteristics:
• standard design, either a.c. or d.c., without additional special electrical, mechanical, or acoustical modifications intended to reduce the sound power level;
• rated output from 1 kW (or kVA) up to and including 5 500 kW (or kVA);
• rated speed not greater than 3 750 min–1.
– provides guidance for the determination of noise levels for a.c. cage induction motors supplied by converters.
Excluded are a.c. motors supplied by converters. For these conditions see IEC 60034-17 for guidance.
The object of this standard 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. This standard does not provide correction for the existence of tonal characteristics.
Sound pressure levels at a distance from the machine may be required in some applications, such as hearing protection programs. Information is provided on such a procedure in Clause 8 based on a standardized test environment.
NOTE 1 This standard recognizes the economic reason for the availability of standard noise-level machines for use in non-critical areas or for use with supplementary means of noise attenuation.
NOTE 2 Where sound power levels lower than those specified in Tables 1 or 2 are required, these should be agreed between the manufacturer and the purchaser, as special electrical, mechanical, or acoustical design may involve additional measures.