Frequency Inverter and Solar Inverter Repair

Comprehensive VFD & PV Inverter Service

Industrial frequency inverters and photovoltaic inverters are advanced power electronics devices controlling electric motors or converting solar energy into grid power. Their failure means production downtime or loss of revenue from PV farms. EFIXLAB offers professional service for all types of inverters with full power-electronics regeneration.

Industrial Frequency Inverters — Supported Manufacturers

Siemens

Full range of Siemens frequency converters:

SINAMICS G120 — compact inverters (PM power module, CU Control Unit repair)
SINAMICS G120C/D/P — control board regeneration, IGBT replacement
SINAMICS S120 — modular drive systems (Active/Motor/Infeed Module service)
SINAMICS V20/V90 — economy drives (electronics and power supply repair)
MICROMASTER MM4 — legacy drives (older platform regeneration)
SIMOVERT Masterdrives — classic inverters (VC/MC service)

ABB

ACS880 — all-compatible drives (IGBT module and mainboard repair)
ACS580 — general purpose drives (control electronics regeneration)
ACS550/510 — economy inverters (capacitor and IGBT replacement)
ACS800 — high performance drives (direct torque control service)
ACS355/150 — compact (power supply and power module repair)

Danfoss

VLT AutomationDrive FC 300 — universal (power module regeneration)
VLT HVAC Drive FC 100 — HVAC applications (electronics repair)
VLT Micro Drive FC 51 — compact (power component replacement)
VLT Decentral Drive FCD 300 — decentralized (IP66/IP69 service)

Schneider Electric

Altivar Process — ATV900, ATV600 (power module and controller repair)
Altivar Machine — ATV320, ATV340 (electronics regeneration, IGBT replacement)
Altistart — soft starters (thyristor and control circuit service)

Lenze

i500 — frequency inverters (power and control module repair)
8400 — vector drives (power electronics regeneration)
9300 — servo drives (precision drive service)

SEW Eurodrive

Movidrive MDX — modular systems (power and communication module repair)
Movitrac LTE-B — compact (electronics regeneration)
Moviaxis — multi-axis servo (multi-axis system service)

Yaskawa

GA500/700 — general purpose (IGBT module and EMI filter repair)
V1000 — compact drives (power supply and control electronics regeneration)
A1000 — matrix converter (advanced topology service)

Mitsubishi Electric

FR-A800/F800 — vector / scalar inverter repair
FR-E700/D700 — economy drives (capacitor and IGBT replacement)

Rockwell / Allen-Bradley

PowerFlex 525/527 — AC drives (mainboard and power module repair)
PowerFlex 753/755 — high performance (power electronics regeneration)

Photovoltaic Inverters — Manufacturers

SMA Solar Technology

Market-leading solar inverter manufacturer:

Sunny Tripower — STP 15–25 kW (power module, IGBT, capacitor repair)
Sunny Boy — SB 3.0–6.0 (electronics regeneration, inductor replacement)
Sunny Central — SC 500–4600 (large MW central inverter service)
Sunny Highpower PEAK3 — PV farm inverter repair
Common issues — insulation faults, IGBT failures, DC-link capacitors

Fronius International

Fronius Symo — 3–20 kW (power electronics and MPPT controller repair)
Fronius Primo — 3–8.2 kW single-phase (power module regeneration)
Fronius Eco — economy (power component replacement, transformerless repair)
Common issues — grid monitoring errors, relay failures, EMI filter damage

Huawei

SUN2000 — 2–100 kW series (smart optimizer and power electronics repair)
SUN2000L — large-scale (solar farm inverter service)
Common issues — communication errors, AFCI (arc fault detection) failures

Sungrow

SG series — string inverters (IGBT module and controller repair)
SH series — hybrid inverters (battery + solar electronics regeneration)

GoodWe

GW series — on-grid inverters (power and communication module repair)
ES/EM series — hybrid with storage (battery charger service)

Solax Power

X1/X3 series — single/three-phase (power electronics and LCD display repair)
Hybrid series — inverters with battery (BMS interface regeneration)

SolarEdge

SE series — inverters with optimizers (DC optimizer and inverter repair)
StorEdge — hybrid (battery controller and DC/DC converter service)

Enphase (micro-inverters)

IQ7/IQ8 series — micro-inverters (MOSFET power module repair)
Envoy Gateway — communication controller repair

What We Repair

Power Modules (IGBT/MOSFET)

The most common inverter failure:

Burnt IGBT — Infineon, Semikron, Mitsubishi module replacement
Damaged gate drivers — gate driver circuit regeneration
Blown anti-parallel diodes — reverse diode replacement
Cooling problems — heatsink, fan, thermal paste replacement

DC-Link Capacitors

Swollen capacitors — high-voltage electrolytic replacement (400–800 V DC)
Increased ESR — capacitance degradation, increased ripple
Electrolyte leaks — damage from overheating
Preventive replacement — after 5–10 years of operation

Control Boards

Processors & DSP — microprocessor and DSP IC replacement (TI, ARM)
Memory — Flash, EEPROM regeneration with parameters
FPGA — programmable logic reprogramming
Optoisolators — galvanic isolation circuit replacement

Auxiliary Power Supplies

24 V, 15 V, 5 V power supply repair for control electronics
DC/DC converter regeneration
Voltage regulator IC replacement

Sensors & Transducers

Current sensors — Hall sensor and shunt repair
Voltage sensors — divider and isolated transducer regeneration
Temperature sensors — NTC, PTC, thermistor replacement
Encoders — motor encoder repair (servo drives)

Communication Interfaces

Profibus/Profinet — industrial communication module repair
Ethernet/Modbus — TCP/IP and RS485 port regeneration
CANopen/DeviceNet — CAN bus interface service
WiFi/4G (PV inverters) — wireless communication module repair

EMI Filters & Protection Circuits

EMI filter regeneration
Varistor repair (surge protection)
Relay and contactor replacement
Ground Fault Detection circuit regeneration (PV inverters)

Typical Failures

Inverter Alarm Errors

Overcurrent / OC — blown IGBT, motor short, encoder issues
Overvoltage / OV — braking resistor failure, DC-link problems
Overheat / OH — power module overheating, fan failure
Ground Fault / GF — ground short, motor insulation damage
Communication Error — port failure, bus problems

Solar Inverter Errors

Grid Fault — grid synchronization issues, grid relay damage
Isolation Fault — PV-to-ground insulation loss, transformer damage
DC Overvoltage — excessive panel voltage, MPPT failure
Arc Fault (AFCI) — electric arc detection, DC connector damage
Temperature High — overheating, fan failure, blocked heatsinks

Mechanical & Thermal Problems

Swollen capacitors — high temperature operation, end of life
Dried thermal paste — loss of IGBT-to-heatsink thermal contact
Corrosion — operation in moisture or aggressive environments (coastal PV farms)
Contamination — dust and deposits on heatsinks (reduced cooling efficiency)