Acoustic Noise Or Vibration - Danfoss VLT HVACDrive Instruction Manual

8 Troubleshooting

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
8-12
MG.11.AB.22 - VLT ® is a registered Danfoss trademark
VLT ® HVAC Drive Instruction Manual