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Repair-return · VFD and AC drive

VFD and AC drive repair in India

Star Automations repairs VFDs and AC drives at component level at its factory in Puducherry, for plants and OEMs across India. Each drive is powered up on a test rig and run with a motor under load before it is returned with a printed test report. Repair warranty is 3 months to 1 year, stated on each quotation.

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A repaired VFD back in service, running at 50 Hz
01How we test

How we test

Every VFD is powered up on a test rig and run with a motor under load before return.

  • Inward check with photos; serial number logged.
  • Fault traced at component level: power stage, gate drive, control, feedback.
  • Quote with findings before work starts.
  • Tested on a rig or custom jig; drives run with a motor under load.
  • All work at ESD-protected benches.
  • Printed test report, traceable by serial number.
02Faults

Typical VFD faults we fix

  • No power or no display
  • Failed IGBT modules or input rectifier
  • DC bus capacitor failure, pre-charge relay and resistor faults
  • Overcurrent, overvoltage, undervoltage and ground-fault trips
  • Control board and communication card faults
  • Cooling fan and heatsink problems
03Brands

Brands we work on

Brand names describe the equipment we repair. Not listed? Send the nameplate and we check before you ship.

  • ABB
  • Allen-Bradley (PowerFlex)
  • Control Techniques
  • Danfoss
  • Delta
  • Emerson
  • Fuji Electric
  • Hitachi
  • Inovance
  • Invertek
  • KEB
  • L&T
  • Lenze
  • LS Electric
  • Mitsubishi
  • Nord
  • Omron
  • Parker
  • Schneider Electric (Altivar)
  • SEW-Eurodrive
  • Siemens (SINAMICS, MICROMASTER)
  • Teco
  • Toshiba
  • Vacon
  • WEG
  • Yaskawa

VFD repair turnaround: same day, 3 days or 7 days

Emergency: same day

For a stopped line. Send the nameplate and trip code first.

Urgent: 3 days

Once the fault is confirmed on inspection.

Standard: 7 days

Planned repair with the full test and a printed report.

Time depends on the fault and on parts. We are an independent multi-brand repair company, not an OEM service centre.

VFD trip codes: what to check first

Trip names differ by brand. These are the common groups. Always confirm against the manual for your drive.

Overcurrent

Can be the power stage, gate drive, current sensing, motor or cable. Disconnect the motor and see if the trip stays.

Overvoltage

Often a braking or deceleration problem, a braking resistor or chopper fault, or high supply voltage.

Undervoltage

Supply dip, a weak DC bus capacitor or a pre-charge fault.

Ground fault

Motor or cable insulation fault, or a power stage fault. Do not keep resetting into it.

Overtemperature

Blocked fan or heatsink, a failed cooling fan or a hot enclosure.

Safety: power off and let the DC bus discharge before touching the drive.

VFD repair by brand and city

05Questions

VFD and AC drive questions

More answers on the FAQ page.

Do you repair VFDs at component level?

Yes. We trace the fault on the board, including the power stage, DC bus and control circuits, replace the failed components and run the drive with a motor under load before return.

My VFD trips on overcurrent. Can it be repaired?

Usually. Overcurrent trips often trace to the power stage, gate drive or current sensing, and sometimes to the motor or cable. Send the model and trip code, and the motor details if you suspect it.

Do you repair large VFDs?

Yes. Send the model, rating and fault. We confirm what we can test before you ship, and arrange pickup where needed.

What comes back with a repaired VFD?

A printed test report with the tests, acceptance criteria and results, traceable by serial number, and a GST invoice. Findings are shared with the quote before work starts.

How much does VFD repair cost?

It depends on the drive, the fault and the parts needed. We inspect first and quote before any repair starts. Send the nameplate and the trip code.

Do you repair VFDs near me?

We repair VFDs at our Puducherry factory and take drives by courier from anywhere in India. For Bengaluru, see VFD repair in Bengaluru.

Also repaired at Star Automations: power electronics, e-mobility and solar

Your VFD and drive repair partner also repairs solar inverters, UPS units and EV chargers. These use the same power-stage and control-board repair, so one supplier covers drives and the power electronics around them. Send the model and fault and we confirm repairability before you ship.

UPS repair

Online, line-interactive and industrial UPS boards.

Send a part number or a photo of the nameplate.

We reply with what we can do and what happens next. WhatsApp or call +91 97866 22233, or email info@starautomations.com.

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