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Mechanical Design
3.8 Noise
3.8 Noise
Noise is measured in a room with low reflection characteristics according to DIN
EN 21 680–1 – however, at rated power. The noise level is specified as A-weighted
measuring surface sound pressure level L
This value is the spatial average value of the sound pressure levels measured at
the measuring surface. The measuring surface is a cube 1 m away from the sur-
face of the motor. The sound power level is also specified as L
The specified values apply for 50 Hz operation. The tolerance is +3 dB.
The fan noise increases at speeds that are higher than the rated speed of self-ven-
tilated motors.
Table 3-6
A-weighted measuring surface sound pressure level and sound power level at the
rated power
Normal version
Frame size Measuring surface sound pressure level (L
71
80
90
112
132
160
1FU8/3-42
Sound power level
Sound power level (L
)
WA
2-pole
L
L
pfA
WA
dB (A)
dB (A)
–
–
60
71
–
–
62
74
–
–
–
–
in dB (A).
pfA
)
pfA
4-pole
L
L
pfA
WA
dB (A)
dB (A)
62
73
63
74
60
71
62
73
–
–
–
–
Siemens AG, 2003. All rights reserved
SIEMOSYN Motors, 1FU8 (PFU) – 09.03 Edition
09.03
in dB (A).
WA
6-pole
L
L
pfA
WA
dB (A)
dB (A)
–
–
–
–
–
–
–
–
63
75
62
74
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