Danfoss VLT FC 102 Operating Instructions Manual page 85

Diagnostics and Troubleshoo...
Symptom
Acoustic noise or vibration
(for example a fan blade is Resonances, for example in the
making noise or vibrations motor/fan system.
at certain frequencies)
Table 7.5 Troubleshooting
MG16I302
Operating Instructions
Possible cause
Bypass critical frequencies by using
parameters in parameter group
4-6* Speed Bypass.
Turn off over-modulation in
parameter 14-03 Overmodulation.
Change switching pattern and
frequency in parameter group
14-0* Inverter Switching.
Increase Resonance Dampening in
parameter 1-64 Resonance
Dampening.
Danfoss A/S © 04/2015 All rights reserved.
Test
Check if noise and/or vibration
have been reduced to an
acceptable limit.
Solution
7
83
7