Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 123)

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
Troubleshooting
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 121