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Frequency Inverters Repair
Professional VFD and Inverter Service
Frequency inverters (VFDs) are critical components in modern drive systems. EFIXLAB offers component-level repair of all major brands with fast turnaround times to minimize production downtime.
Supported Manufacturers
Siemens Inverters
- SINAMICS G120 - modular CU control unit, PM power modules
- SINAMICS S120 - cabinet units, booksize modules, control units
- MICROMASTER 4 - compact drives 0.12-250 kW
- SINAMICS V90 - servo drives
ABB Drives
- ACS550/ACS580 - industrial standard drives
- ACS800/ACS880 - cabinet drives with DTC control
- ACS355 - machine drives, compact
Danfoss Drives
- VLT AutomationDrive FC301/FC302 - universal drives
- VLT HVAC Drive FC102 - HVAC applications
Other Manufacturers
- Schneider Electric - Altivar series
- SEW-Eurodrive - MOVITRAC/MOVIDRIVE
- Lenze - i500/8400 series
- Yaskawa - V1000/A1000 series
- Mitsubishi - FR-A/FR-D/FR-E series
Common Defects
Power Electronics Failures
- IGBT module short circuit - overload, motor short, defective gate driver
- Rectifier defect - diode bridge, input fuse blown
- DC-link capacitors - drying out (ESR increase), ripple voltage too high
- Gate driver failure - optocoupler, driver IC, supply voltage
Control Board Defects
- Microcontroller failures - watchdog errors, boot problems
- Defective RAM/Flash memory
- Damaged communication interfaces - RS485, Profibus, Ethernet
Auxiliary Circuits
- Fan failures - overheating, reduced cooling
- Power supply 24V defective
- Relay defects in pre-charging circuit
Repair Services
- IGBT module replacement - original or equivalent high-quality modules
- Rectifier repair - bridge rectifiers, input stages
- DC-link capacitor replacement - upgrade to longer-life capacitors possible
- Gate driver board repair
- Control board repair - SMD work, IC replacement
- Fan replacement and thermal management
- Parameter backup and restoration