Danfoss VLT Refrigeration Drive FC 103 Operating Instructions Manual page 86

Diagnostics and Troubleshoo...
Symptom
Acoustic noise or vibration
(for example a fan blade is
making noise or vibrations
at certain frequencies)
Table 7.5 Troubleshooting
7 7
82
®
VLT Refrigeration Drive FC 103 Low Harmonic Drive
Possible cause
Resonances, for example in the
motor/fan system.
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Test
Bypass critical frequencies by using
parameters in parameter group
4-6* Speed Bypass.
Turn off overmodulation 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.
Solution
Check if noise and/or vibration
have been reduced to an
acceptable limit.
MG16N102