Why VFD Repair Beats Replacement Every Time
A 75 kW ABB ACS880 industrial drive costs €4,800–7,200 new, with typical delivery of 6–14 weeks. An 110 kW Danfoss FC302 costs €6,500–9,000 new. A 160 kW Siemens G120 cabinet costs €9,000–14,000. These are the list prices — in the current supply chain environment, actual delivery times are often longer. Meanwhile, your pump, compressor, or production line is offline, losing €500–5,000 per hour.
Board-level repair restores the same drive, with the same parameters, the same motor tuning, and the same PLC integration — in 3–7 days, at 15–35% of new drive cost. No re-commissioning. No parameter re-entry. No PLC integration rework.
VFD Brands We Repair
ABB
ABB drives are the most widely installed industrial drives in Europe. We repair across the complete ABB product range:
- ACS880 (0.55–5600 kW): ABB's current industrial drive platform. Key failures: IGBT phase module (R6 / R7 / R8 / R9 frame sizes), RDCU control unit PCB failure, BCUN brake chopper unit, DDCS fiber optic communication module failure. The RDCU control unit failure is extremely common after power surges — it causes "drive not ready" fault on power-up with no output.
- ACS800 (0.55–2800 kW): Previous generation, enormous installed base. Common: IGBT module (INT board) failure, RMIO-11C main control board failure, RPCB capacitor bank failure in frame R8 and above, APBU optical pulse buffering unit failure.
- ACS550 / ACS510 / ACS355: HVAC and pumping drives. Very common failures: the input EMC filter capacitors (cause leakage current fault), gate driver board, and main control board.
- ACH580 / ACS580: Current HVAC pump and fan drives. Common: control panel communication fault, IGBT phase module, capacitor bank.
- ACS6000 / ACS5000: Medium voltage drives (3.3–11 kV). We repair the LCU (Line Control Unit), the inverter cell PCBs, and the gate unit boards for these high-value systems.
Danfoss
- FC302 / FC301 (0.37–1,400 kW): The most common Danfoss drive in industrial use. The FC302 is found in water treatment plants, process industry, and HVAC systems across Europe. Key repairs: IGBT module (D-frame and E-frame units most commonly), SMPS power card (24V logic supply failure — very common, causes all LED indicators to go dark), control card failure, LCP (Local Control Panel) PCB failure.
- FC200 / VLT 2800 / VLT 5000: Legacy drives with enormous installed base in food, beverage, and packaging. We hold stock of IGBT modules and control cards for models no longer in OEM production.
- FC360 / FC280: Compact drives for simple pump and fan applications. Common: capacitor failure, gate driver PCB, SMPS card.
- FC102 / FC202: HVAC-specific drives. Common: control card, LCP, capacitor bank in large frame sizes.
Siemens
- SINAMICS G120 / G120C / G120P: Current Siemens compact drive range, extensively used in manufacturing, HVAC, and water. Common failures: CU240E-2 / CU230P-2 control unit PCB failure (parameter loss, communication fault), IGBT power module failure in PM240-2 power module, STO (Safe Torque Off) terminal board failure causing immediate drive trip.
- SINAMICS G130 / G150: Chassis and cabinet drives for demanding industrial applications (fans, pumps, compressors). Common: IGBT module, DC bus capacitor bank, CU320-2 control unit.
- SINAMICS S120: Servo and multi-axis drive system. ALM (Active Line Module), BLM (Basic Line Module), and Motor Module failures. S120 repairs require axis-level parameter backup — we perform this before any repair.
- SIMODRIVE 611 / 611U / 611D: Legacy CNC servo drives still running Siemens 840D and 810D machining centres across Europe. We repair the NE/NE power supply, the power module (1-axis and 2-axis), and the control module. Spare parts for these legacy drives are extremely scarce — repair is the only option.
- MICROMASTER 440 / 420: Huge installed base in factories built 2000–2010. We repair control boards, IGBT modules, and capacitor banks — and hold stock of discontinued components.
Lenze
- Lenze 8400 TopLine / StateLine / HighLine: Widely used in packaging machinery, printing presses, and conveyor systems. Common failures: power unit IGBT module, application unit PCB failure (Lenze's proprietary combined control/application processor board), FPGA firmware corruption on control board.
- Lenze 9300 servo inverter: Used in high-performance packaging and material handling. Failures: power module, resolver interface board, STO board.
- Lenze i500 / i700: Current generation drives. Control board and power unit failures.
SEW-Eurodrive
- MOVITRAC B / LTE-B+: Simple frequency inverters for conveyor and pump applications. Common: capacitor failure, IGBT module, control PCB.
- MOVIDRIVE B / MDX60B/61B: High-performance drive used in automotive and packaging. Common: power unit IGBT failure, FPGA control board failure, STO board, feedback option board failure.
- MOVIMOT / MOVI-C: Integrated motor-drives. Common: integrated inverter PCB failure, communication module (MOVI-C gateway) failure.
Yaskawa
- A1000 / L1000A / E1000 / U1000: The L1000A is the dominant elevator drive in the US and increasingly in Europe (used in Otis Gen3 and independent lift companies). Common: IGBT module, gate driver card (JPAK-01 / JVOP-147), control board (YPJP-01A).
- GA700 / GA800: Current generation industrial drives. Common: control card, power card, fan failure causing thermal shutdown.
The Anatomy of a VFD Failure
Phase 1 — Gate Driver Board Failure
The gate driver board generates the precise 15V / -8V pulses that switch each IGBT in the inverter bridge. It also provides short-circuit protection for each individual IGBT gate. Gate driver failure is almost always the first stage of a major failure event. Symptom: single-phase output loss, drive trips on "output phase loss" or "overcurrent." If the gate driver failure is caught early, the IGBT module is often still intact — repair cost: €300–600. If caught late, the IGBT follows — cost: €600–2,000 additional.
Phase 2 — IGBT Bridge Failure
Six IGBT devices (or six pairs in parallel for high-power drives) form the inverter bridge. Motor insulation breakdown, phase-to-phase shorts, or ground faults in the motor cable cause a shoot-through event that destroys one or more IGBTs. Symptom: drive fails to start, fault code indicates "DC bus overvoltage" immediately on power-up (the damaged IGBT conducts DC bus voltage to the motor output), or "output short circuit." We replace the IGBT module and always test the gate driver board before returning the drive — a damaged gate driver on an otherwise good IGBT will destroy the new IGBT within days.
Phase 3 — Capacitor Bank Failure
DC bus capacitors in a VFD absorb current ripple between the rectifier and inverter stages. They are rated for 100,000 hours at nominal temperature — in practice, 7–12 years in a hot drive cabinet. As they age, the 120 Hz ripple current causes electrolyte to dry out, reducing capacitance and increasing ESR. The drive compensates by running higher ripple on the bus, which accelerates degradation — a positive feedback loop that ends with DC bus overvoltage faults or complete capacitor failure. We replace capacitor banks as a complete matched set, never individual units.
Parameter Preservation
Before any VFD repair, we upload the complete parameter set from the drive if the control board is still functional. For drives where the control board has failed before parameters could be saved, we work with the customer and the OEM parameter database to reconstruct the correct parameter set for the application. This service is included at no additional charge.
Turnaround and Cost
Gate driver board repair: €280–550. IGBT module replacement: €400–2,800 (depending on power class). Capacitor bank replacement: €300–1,200. Control board repair: €350–900. Standard turnaround: 3–7 working days. Emergency 24–48 hour service available. 12-month warranty. All repairs include free parameter backup/restore service.