Danfoss VLT FC 103 Operating Instructions Manual page 96

Basic Troubleshooting
Symptom
Acoustic noise or vibration
(e.g. a fan blade is making
noise or vibrations at
certain frequencies)
Table 10.1 Troubleshooting
10 10
94
Operating Instructions
Possible cause
Resonances, e.g. in the motor/fan
system
Danfoss A/S © Rev. 05/2014 All rights reserved.
Test
Bypass critical frequencies by using
parameters in parameter group
4-6* Speed Bypass.
Turn off overmodulation in
14-03 Overmodulation.
Change switching pattern and
frequency in parameter group
14-0* Inverter Switching.
Increase Resonance Dampening in
1-64 Resonance Damping.
Solution
Check if noise and/or vibration
have been reduced to an
acceptable limit.
MG16J202