8.3 Acoustic Noise or Vibration
If the motor or the equipment driven by the motor, e.g., a fan blade, is making noise or vibrations at certain frequencies, try
the following:
•
Speed Bypass, parameter group 4-6* Speed Bypass
•
Overmodulation, 14-03 Overmodulation set to [0] Off
•
Switching pattern and switching frequency parameter group 14-0* Inverter Switching
•
Resonance Dampening, 1-64 Resonance Dampening
The acoustic noise from the adjustable frequency drive comes from three sources:
1. DC intermediate circuit coils
2. Integral fan
3. RFI filter choke
Frame Level [dBA]
H1 57.3
H2 59.5
H3 53.8
H4 64
H5 63.7
H6 71.5
H7 67.5 (75 kW 71.5 dB)
H8 73.5
H9 60
H10 62.9
I2 50.2
I3 54
I4 60.8
I6 70
I7 62
I8 65.6
Table 8.9 Typical Values Measured at a Distance of 3.3 ft [1 m] from the Unit
General Specifications and ... Design Guide
MG18C522 Danfoss A/S © Rev. 2014-01-14 All rights reserved. 117
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