AC Drive Repair
Component-level AC variable frequency drive repair for all major brands — fast turnaround, full load tested, warranted.
India's #1 AC drive repair specialists. Our schematic-driven approach, 2M+ component inventory, and dedicated VFD test benches mean your drive is diagnosed scientifically and repaired at the component level — not replaced with guesswork.
Synchronics is India's leading specialist in AC drive and VFD repair. Our dedicated drive repair team handles everything from small fractional kW drives to large 500kW+ industrial drives. We repair at the component level — IGBT modules, gate driver boards, control cards, power boards, capacitor banks — ensuring a proper fix rather than a temporary workaround.
What is an AC Drive?
An AC drive, also called a variable frequency drive (VFD) or inverter, is an electronic power controller that adjusts the speed and torque of AC electric motors by varying the frequency and voltage of the power supply. AC drives are critical components in industrial automation, used in applications ranging from conveyor systems and pumps to HVAC and manufacturing lines. When an AC drive fails, it can halt entire production lines — costing manufacturers thousands per hour in downtime.
Also known as: variable frequency drive, VFD, frequency inverter, adjustable speed drive
Diagnosis Guide
Common AC Drive Problems We Fix
Experiencing any of these symptoms? Our engineers have diagnosed and repaired thousands of these faults.
Blown IGBT Modules
Drive trips on overcurrent, no output to motor, short-circuit alarm
Overvoltage spikes, motor winding short, load jam
DC Bus Capacitor Failure
DC bus voltage unstable, undervoltage trip, humming noise from capacitor bank
Ageing electrolytic capacitors, high ambient temperature, voltage stress
Gate Driver Circuit Fault
IGBT not switching properly, distorted output waveform, intermittent tripping
Optocoupler degradation, gate resistor failure, pulse transformer open
Control Card Failure
No display, communication loss, parameter corruption, erratic behaviour
Power surge, firmware corruption, component ageing, ESD damage
Rectifier Bridge Failure
No DC bus voltage, drive does not power up, input fuse blown
Input power surge, lightning strike, phase imbalance
Cooling Fan Failure
Drive overheats, thermal alarm, reduced output derating
Fan bearing wear, dust accumulation, blocked airflow paths
How It Works
Our AC Drive Repair Process
A systematic, schematic-driven repair process — from receipt to dispatch.
Receive & Visual Inspect
Drive is logged in our ERP system, photographed, and visually inspected for obvious damage — burnt components, swollen capacitors, loose connections.
Power-Up & Fault Diagnosis
Safe power-up on isolated supply with oscilloscope monitoring. Gate signals, DC bus voltage, and control card outputs are measured against schematic reference values.
Component-Level Repair
Failed components identified from diagnosis are replaced — IGBTs, gate drivers, capacitors, optocouplers — using genuine or equivalent-spec parts from our 2M+ inventory.
Parameter Restore & Config
Drive parameters restored from backup or factory defaults. Motor parameters, accel/decel ramps, and protection settings configured per customer specification.
Full Load Bank Test
Repaired drive connected to our load bank and tested at rated current and voltage. Thermal performance verified with infrared imaging under sustained load.
QA Sign-Off & Dispatch
Final QA inspection, test report generated, 6-month warranty certificate issued. Drive professionally packed and dispatched within 24 hours.
Thorough Inspection
What We Inspect in Every AC Drive
Every unit goes through a comprehensive inspection checklist before and after repair.
IGBT Power Stage
DC Bus Section
Rectifier Input
Control Board
Gate Driver Circuit
Cooling System
The Synchronics Advantage
Why Choose Us for AC Drive Repair
Schematic-Driven Diagnosis
Every AC drive repair starts with the complete circuit schematic. Our 15,000+ schematic library means we understand the circuit before touching a single component.
Fastest Turnaround in India
Most AC drive repairs completed within 48 hours. Emergency same-day service available for critical production lines that cannot afford downtime.
Full Load Bank Testing
Every repaired drive is tested at rated load current on our dedicated VFD test benches — handling drives up to 500kW capacity.
Troubleshooting
Common AC Drive Fault Codes We Fix
Seeing one of these error codes? We diagnose and repair the root cause.
Overcurrent during acceleration or deceleration
IGBT failure, motor winding short, mechanical load jam
DC bus overvoltage detected
Regenerative energy, braking resistor open, decel time too short
DC bus undervoltage
Input power loss, capacitor bank degradation, charging circuit fault
Drive overheating / thermal fault
Cooling fan failure, blocked airflow, high ambient temperature
Ground fault detected at output
Motor insulation breakdown, cable damage, moisture ingress
Short circuit at output terminals
IGBT shoot-through, motor winding short, output cable short
Fault codes vary by manufacturer (ABB ACS, Siemens Sinamics, Danfoss VLT, etc.). Contact us with your specific drive model and fault code for expert diagnosis.
Industries Served
Where AC Drives Are Used
Cement & Mining
Kiln drives, crusher motors, conveyor systems
Water & Wastewater
Pump VFDs, blower drives, aeration systems
HVAC & Building
AHU fans, chiller compressors, elevator drives
Steel & Metals
Rolling mill drives, furnace blowers, crane hoists
Food & Pharma
Mixer drives, conveyor VFDs, packaging machines
Oil & Gas
Compressor drives, pump stations, pipeline motors
Trusted Brands
Brands We Service
Component-level repair for all major manufacturers
FAQ
Frequently Asked Questions
Most AC drive repairs are completed within 48-72 hours after receipt. Complex faults or rare component sourcing may take slightly longer. We provide an estimated turnaround with the repair quotation.
Yes — IGBT module replacement is one of our most common repairs. We use genuine or equivalent-spec IGBT modules and always investigate the root cause of the IGBT failure to prevent recurrence.
Yes. All repaired AC drives come with a written 6-month warranty. If the same fault recurs within the warranty period, we repair it free of charge.
Yes. We regularly repair drives up to 500kW and beyond. Our load bank can test drives at full rated current to ensure the repair is validated under real operating conditions.
Yes. We always attempt to back up drive parameters before starting any repair work. After repair, parameters are restored to your original or factory specification.
AC Drive Repair Services Across India
Synchronics provides expert AC drive repair services for industries across India — Vadodara, Ahmedabad, Mumbai, Pune, Chennai, Bangalore, Delhi, Kolkata, and all major industrial cities. Our pan-India logistics network ensures your AC drive reaches our facility safely and is returned promptly after repair.
Whether you have a small 0.37kW AC drive 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 brands including ABB ACS, Siemens Sinamics, Schneider Altivar, Danfoss VLT, Yaskawa, Delta, and many more.
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