Symptom Possible cause Test Solution
Acoustic noise
or vibration
(e.g., a fan
blade is
making noise
or vibrations
at certain
frequencies)
Resonances, e.g., in the
motor/fan system
Bypass critical frequencies by using
parameters in parameter group 4-6* Speed
Bypass.
Check if noise and/or vibration have been
reduced to an acceptable limit.
Turn off overmodulation in 14-03 Overmo-
dulation.
Change switching pattern and frequency in
parameter group 14-0* Inverter Switching.
Increase Resonance Dampening in
1-64 Resonance Dampening.
Table 7.5 Troubleshooting
Maintenance, Diagnostics an... Instruction Manual
MG16E322 Danfoss A/S © Rev. 2014-04-10 All rights reserved. 47
7 7
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