Danfoss VLT HVAC Basic Drive FC 101 Spécifications télécharger pdf (Page 111)

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

•

Over-modulation, 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 frequency converter comes

from 3 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 1 m

from the Unit

General Specifications and ...

VLT

HVAC Basic Drive FC 101 Design Guide

MG18C502 - Rev. 2013-09-06 109

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Danfoss VLT HVAC Basic Drive FC 101 Spécifications Page 111