8.2 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*
• Overmodulation, parameter 14-03 set to off
• Switching pattern and frequency parameter group 14-0*
• Resonance Dampening, parameter 1-64
8 Troubleshooting VLT
®
HVAC Drive Instruction Manual
8-12
MG.11.AB.22 - VLT
®
is a registered Danfoss trademark
8
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