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 over-modulation in
14-03 Overmodulation
Change switching
pattern and
frequency in parameter
group
14-0* Inverter Switching
Increase Resonance Dampening in
1-64 Resonance Dampening
Table 9.1 Troubleshooting
Basic Troubleshooting
VLT
®
HVAC Drive Operating Instructions
MG11AI02 - VLT
®
is a registered Danfoss trademark
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9 9
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