SV500 monitors inverters (VFDs). Failure impacts and diagnostic indicators are listed below.
DC link
- Failure impact
- Voltage instability, more harmonics, inverter trips, reduced motor performance
- Diagnostic indicators
- DC voltage and current components, transient events, harmonics
Switching stage
- Failure impact
- IGBT/MOSFET degradation, EMI, switching loss, overheating, insulation stress
- Diagnostic indicators
- Switching harmonics and sidebands in voltage and current
Overheating
- Failure impact
- Motor degradation, shorter life, lower efficiency
- Diagnostic indicators
- RMS current, harmonic and distortion indices, DC components
Load
- Failure impact
- Overheating, mechanical stress, torque instability
- Diagnostic indicators
- RMS current and imbalance, current crest factor, harmonic distortion, phase angle imbalance
Rectifier stage
- Failure impact
- Higher current harmonics and TDD, upstream voltage distortion, overheating
- Diagnostic indicators
- Rectifier harmonic components in voltage and current