VFD Drive Repair
Variable Frequency Drive repair specialists — all brands, all kW ratings from 0.37kW to 500kW+, component-level repair, full load bank tested before dispatch.
India's fastest VFD repair turnaround. With a 2M+ component inventory, dedicated VFD load banks up to 500kW, and 48-hour turnaround on most repairs, we get your production running again — not waiting weeks for a replacement drive.
Variable Frequency Drives are the workhorses of modern industry — controlling pumps, fans, compressors, conveyors, and virtually every motor-driven process. When a VFD fails, production stops. Synchronics provides the fastest VFD repair turnaround in India, with 48-hour repair on most models from 0.37kW micro drives to 500kW+ industrial units. We repair at the component level — IGBT modules, DC bus capacitors, rectifier bridges, gate drivers, control boards — and validate every repair with full load bank testing at rated current.
What is a VFD (Variable Frequency Drive)?
A variable frequency drive (VFD) is an electronic device that controls the speed of an AC motor by converting fixed-frequency AC power into variable-frequency output. VFDs reduce energy consumption by up to 50% in pump and fan applications, extend motor life by providing soft-start capability, and enable precise process control in industries like cement, steel, pharmaceutical, and food processing. VFD failure typically manifests as overcurrent faults, IGBT module damage, or DC bus capacitor degradation.
Also known as: variable speed drive, AC drive, frequency converter, inverter drive
Diagnosis Guide
Common VFD Drive Problems We Fix
Experiencing any of these symptoms? Our engineers have diagnosed and repaired thousands of these faults.
IGBT Module Failure
Overcurrent trip at power-up or during acceleration, no motor output, short circuit alarm, fuse blown
Overvoltage transients, motor winding short, mechanical load jam, gate driver degradation over time
DC Bus Capacitor Ageing
DC bus voltage ripple, undervoltage trip, humming noise from capacitor bank, reduced drive performance
Electrolytic capacitor dry-out from age and heat, high ambient temperature, voltage stress exceeding rated values
Control Board Fault
No display, drive does not boot, parameter corruption, communication loss, erratic motor behaviour
Power surge reaching control circuits, firmware corruption, component ageing, ESD damage during maintenance
Rectifier Bridge Failure
No DC bus voltage, drive does not power up, input fuse or MCB trips immediately
Input power surge, lightning strike, severe phase imbalance, soft-charge relay failure
Keypad / Display Dead
Blank display, keypad buttons unresponsive, cannot read parameters or fault codes
Display ribbon cable fault, keypad PCB damage, display module backlight failure, communication fault between keypad and main board
Output Relay / Contactor Stuck
Motor does not stop when commanded, output remains energised, safety interlock triggered
Relay contact welding from overcurrent, contactor coil failure, output transistor latch-up on relay driver circuit
How It Works
Our VFD Repair Process
A systematic, schematic-driven repair process — from receipt to dispatch.
Receive & Visual Inspection
VFD is logged in our ERP system, photographed, and visually inspected for obvious damage — burnt components, swollen capacitors, arc marks, loose connectors, and signs of moisture or contamination.
Electrical Diagnosis
Safe power-up on isolated supply with oscilloscope and multimeter monitoring. DC bus voltage, gate signals, rectifier performance, and control card outputs are systematically measured.
Root Cause Analysis
Fault symptoms are traced to their root cause using circuit schematics. We identify not just the failed component but why it failed — preventing recurrence after repair.
Component Replacement
Failed components replaced with genuine or equivalent-spec parts from our 2M+ inventory — IGBTs, capacitors, gate drivers, rectifiers, optocouplers, and control ICs.
Parameter Setup & Configuration
Drive parameters restored from backup or configured per customer specification — motor nameplate data, acceleration/deceleration ramps, protection thresholds, and I/O assignments.
Full Load Test & Dispatch
Repaired VFD is connected to our load bank and tested at rated current and voltage with thermal imaging verification. Test report, 6-month warranty certificate, and professional packing for dispatch.
Thorough Inspection
What We Inspect in Every VFD
Every unit goes through a comprehensive inspection checklist before and after repair.
Power Inverter Stage
DC Bus Capacitor Bank
Input Rectifier Section
Control Board
I/O Terminals
Cooling System
The Synchronics Advantage
Why Choose Us for VFD Drive Repair
All kW Ratings — 0.37kW to 500kW+
From small single-phase VFDs on packaging machines to massive 500kW drives on cement kiln fans, our load bank and test infrastructure handle every size. No drive is too small or too large.
48-Hour Turnaround
Most VFD repairs completed within 48 hours of receipt. Emergency same-day service available for critical process drives where every hour of downtime costs thousands.
2M+ Component Inventory
Our massive inventory of over 2 million components — IGBTs, capacitors, gate drivers, control ICs — means we rarely wait for parts. This is how we deliver industry-leading turnaround times.
Troubleshooting
Common VFD Fault Codes We Fix
Seeing one of these error codes? We diagnose and repair the root cause.
Overcurrent during acceleration, deceleration, or constant speed operation
IGBT failure, motor winding short, cable insulation breakdown, mechanical load jam
DC bus overvoltage — exceeds safe operating level
Regenerative energy from motor, braking resistor open, deceleration time too short, mains voltage spike
DC bus undervoltage — below minimum operating level
Input power dip/loss, DC bus capacitor degradation, charging circuit fault, loose input connection
VFD overheating — internal temperature above safe threshold
Cooling fan failure, blocked ventilation, high ambient temperature, sustained overload operation
Ground fault detected on motor output
Motor winding insulation breakdown, output cable damage, moisture ingress in motor or junction box
Short circuit at output terminals
IGBT shoot-through failure, motor winding turn-to-turn short, output cable short, terminal block fault
VFD fault codes vary by manufacturer and model series (ABB ACS, Siemens G/S series, Danfoss VLT/FC, Schneider Altivar, etc.). Contact us with your specific VFD model and fault code for expert diagnosis.
Industries Served
Where VFD Drives Are Used
Pumps & Water Systems
Borewell pumps, booster sets, irrigation, municipal water supply
HVAC & Building Services
AHU fans, chiller compressors, cooling towers, elevator drives
Conveyors & Material Handling
Belt conveyors, bucket elevators, screw conveyors, feeders
Compressors & Blowers
Screw compressors, centrifugal blowers, vacuum pumps
Textile & Spinning
Ring frame drives, winding machines, loom motors, humidification
Food & Beverage
Mixers, homogenisers, bottling line conveyors, refrigeration compressors
Trusted Brands
Brands We Service
Component-level repair for all major manufacturers
FAQ
Frequently Asked Questions
The most common causes are blown IGBTs (from overvoltage spikes, motor shorts, or load jams), failed DC bus capacitors (ageing and heat), gate driver circuit faults (optocoupler degradation), and control card failures from electrical noise or moisture. We diagnose and fix the root cause to prevent recurrence.
Most VFD repairs are completed within 48 hours of receipt. Standard turnaround is 48-72 hours. Emergency same-day service is available for critical production VFDs. Complex faults or rare component sourcing may take slightly longer — we provide an estimated turnaround with the repair quotation.
Yes. We regularly repair VFDs up to 500kW and beyond. Our load bank facility can test drives at full rated current to ensure the repair is validated under real operating conditions before dispatch.
Contact us with the brand, model number, kW rating, and fault description. We will provide a shipping address and packing guidance. Once received, we diagnose within 24 hours and provide a detailed repair quotation with estimated cost and turnaround time.
Yes. All repaired VFDs come with a written 6-month warranty covering the repaired components and workmanship. If the same fault recurs within the warranty period, we repair it free of charge.
VFD Repair Services Across India
Synchronics provides expert Variable Frequency Drive repair services for industries across India — Vadodara, Ahmedabad, Mumbai, Pune, Chennai, Bangalore, Delhi, Kolkata, Hyderabad, and all major industrial cities. Our pan-India logistics network ensures your VFD reaches our facility safely and is returned promptly after component-level repair and full load bank testing.
Whether you have a small 0.37kW VFD from a packaging machine or a large 500kW drive from a cement plant, our team of 180+ engineers has the expertise and infrastructure to diagnose and repair it at the component level. We service all major VFD brands including ABB ACS series, Siemens Sinamics G and S series, Danfoss VLT and FC series, Schneider Altivar, Yaskawa, Delta, and many more — with a 2M+ component inventory that ensures the fastest turnaround in the industry.
Get Your Equipment
Back in Action — Fast
Send us your faulty industrial electronics. Our engineers will diagnose it and provide a detailed quote within 24 hours — with no obligation to proceed.
Free Evaluation
No obligation
48hr Turnaround
Fastest in India
6-Month Warranty
Every repair
No Fix, No Charge
Zero risk policy
Pan-India Pickup
Doorstep service