Danfoss VLT HVAC Drive FC 102 Instruction Manual page 51

Diagnostics and Troubleshoo...
Symptom Possible cause
Acoustic noise Resonances, e.g., in the
or vibration motor/fan system
(e.g., a fan
blade is
making noise
or vibrations
at certain
frequencies)
Table 7.5 Troubleshooting
MG11AK22
Instruction Manual
Test
Bypass critical frequencies by using
parameters in parameter group 4-6* Speed
Bypass.
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.
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Solution
Check if noise and/or vibration have been
reduced to an acceptable limit.
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