Acoustic Noise Or Vibration - Danfoss VLT Compressor Drive CDS 803 Design Manual

General Specifications

8.3 Acoustic Noise or Vibration

If the compressor or the equipment driven by the
compressor - for example, a fan - is making noise or
vibrations at certain frequencies, configure the following
parameters or parameter groups to reduce or eliminate the
noise or vibrations:
•
Parameter group 4-6* Speed Bypass.
•
Set parameter 14-03 Overmodulation to [0] Off.
•
Switching pattern and switching frequency
parameter group 14-0* Inverter Switching.
•
Parameter 1-64 Resonance Dampening.
The acoustic noise from the frequency converter comes
from 3 sources:
•
DC intermediate circuit coils
•
Integral fan
•
RFI filter choke
8 8
Enclosure
H3
H4
H5
Table 8.3 Typical Values Measured at a Distance of 1 m
from the Unit
74
®
VLT Compressor Drive CDS 803
Level [dBA]
53.8
64
63.7
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