VFD & AC/DC Drive Repair
Variable frequency drive, inverter and DC drive repair for Canada and the USA
- Free evaluation
- 24–72 hr typical
- 12-month warranty
- Tested on our jigs
Short answer
Can a VFD be repaired?
Yes. Most variable frequency drives can be repaired at component level instead of replaced. We find the root cause, whether it is the IGBT power stage, DC bus, rectifier, control board or cooling, replace the failed parts, then test the drive under power on our own jigs before it ships back with a test report and a 12-month warranty.
What we repair
What we repair on a VFD
IGBT power stage
Shorted IGBT modules, gate drivers and snubber components replaced and tested under power.
DC bus & capacitors
Aged or bulging bus capacitors, pre-charge resistors and contactors, and braking circuits.
Rectifier input
Input diode bridges, SCR front ends and line-side protection that fail after power surges.
Control boards
Main control, keypad and I/O board faults diagnosed and repaired at component level.
DC drive armature & field
Thyristor stacks, armature and field controllers and regulator cards on DC drives.
Cooling & sensing
Cooling fans, heat sink sensors and current sensors that cause overtemperature and false trips.
Diagnosis guide
Common VFD faults we fix
Overcurrent trip on start or under load
Shorted IGBT, failed gate driver, current sensor fault or a motor or cable problem
DC bus overvoltage during deceleration
Braking transistor or resistor failure, or bus voltage sensing fault
Undervoltage or pre-charge fault at power-up
Pre-charge circuit, rectifier bridge or bus capacitors
Overheat alarm after running a while
Failed cooling fan, blocked heat sink or degraded power devices
Ground fault trip
Output stage leakage, current sensing fault, or motor insulation breakdown
Dead drive, no keypad display
Internal switch-mode power supply or control board failure
Quality
How we test every repaired VFD
Parts replaced is not the same as fixed. Every unit is proven under power before it leaves our Mississauga, Ontario repair centre.
- 01
Photos and condition report when the drive arrives
- 02
Root cause found before we quote
- 03
Run under power on our own test jigs
- 04
Test report ships with every repaired drive
All makes & models
We repair every VFD brand
We repair VFDs from any manufacturer, current or obsolete. These are some of the brands and series we see most often. If yours isn't listed, we still repair it.
Allen-Bradley
- PowerFlex 40
- PowerFlex 525
- PowerFlex 700
- PowerFlex 753
ABB
- ACS355
- ACS550
- ACS880
- DCS800
Siemens
- SINAMICS G120
- MICROMASTER 440
- SIMOREG DC Master
Schneider Electric
- Altivar 71
- Altivar 312
- Altivar 630
Yaskawa
- A1000
- V1000
- GA700
Any brand. Any model.
Danfoss VLT · Mitsubishi FR · Parker 590+ · Lenze · Delta · 1,000+ brands
Don't see yours? Ask a technician
Brand names are trademarks of their owners and are used only to identify the equipment we repair.
Your options
Repair, exchange or replace?
Repair your unit
Your original unit, repaired at component level and tested. Usually a fraction of the price of new.
Request a RepairExchange unit
A tested replacement at a lower price. Ship us your unit and we ship the replacement once it arrives.
Ask About ExchangeReplacement part
New, surplus or refurbished, sourced from 1,000+ brands, including discontinued parts.
Request a QuoteFAQ
VFD repair questions
How long does a VFD repair take?
Typical turnaround is 24–72 hours once you approve the quote. Exchange units usually ship within 1–2 business days of receiving your unit.
Do you repair DC drives as well as AC drives?
Yes. We repair DC drives, including thyristor stacks, armature and field controllers and regulator cards, as well as AC variable frequency drives.
Is it worth repairing a VFD instead of buying new?
In most cases, yes. A component-level repair usually costs a fraction of a new drive, and you keep the same unit, so there is no rewiring or reprogramming.
Is the evaluation free?
Yes. We test the drive, find the root cause and send a written quote. No work starts without your approval.
What warranty comes with a VFD repair?
Every drive repair comes with a 12-month warranty.
VFD down? Let's get it running again.
Free evaluationNo work without your approval12-month warranty