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Basic Troubleshooting
Symptom
Acoustic noise or vibration
(e.g. a fan blade is making
Resonances, e.g. in the motor/fan
noise or vibrations at
system.
certain frequencies)
Table 9.1
VLT
®
AQUA Drive D-Frame
Operating Instructions
Possible cause
Bypass critical frequencies by using
parameters in parameter group
4-6* Speed Bypass.
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.
®
MG21A202 - VLT
is a registered Danfoss trademark
Test
Check if noise and/or vibration
have been reduced to an
acceptable limit.
Solution
9
69
9
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