Description
3.4 Structure
1FT7 synchronous motors
22 Operating Instructions, 04/2010, 610.40075.40b
3.4.6 Noise emission
When operated in the speed range 0 to rated speed, 1FT7 motors can reach the following
measuring-surface sound pressure level Lp(A):
Table 3- 8 Sound pressure level
Cooling method Shaft height Measuring-surface sound pressure level
Lp(A)
Natural cooled 1FT703 to 1FT706
1FT708 to 1FT710
65 dB(A) + 3 dB tolerance
70 dB(A) + 3 dB tolerance
Forced ventilation 1FT706 to 1FT710 73 dB(A) + 3 dB tolerance
Water cooled 1FT706
1FT708 to 1FT710
65 dB(A) + 3 dB tolerance
70 dB(A) + 3 dB tolerance
The motors are certified for a wide range of installation and operating conditions. These
conditions, such as rigid or vibration-isolated foundation design, influence noise emission,
sometimes significantly.
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