Symptom Possible cause Test Solution
Acoustic noise or vibration (for
example, a pump impeller blade
makes noise or vibrations at
certain frequencies)
Resonances, for example, in the
motor/pump 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
8 Troubleshooting
Aquavar
®
Intelligent Pump Controller - 150 HP to 600 HP INSTRUCTION MANUAL 149
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