Servo drives, amplifiers and VFDs repaired at the component level
When a drive faults, the axis stops. AST repairs servo drives, servo amplifiers, spindle drives, power supply modules and variable frequency drives from all major manufacturers. Every unit gets a full component-level inspection, and we quote the repair on what we actually find.
After repair, drives are tested on OEM equipment and to OEM specifications before they ship. We also stock hundreds of new and remanufactured drives when replacing is faster.
- Same-day rush evaluations
- OEM components used in every repair
- Power stage, control board and feedback circuits all inspected
- Firmware and parameters kept where the drive allows it
- Exchange units available on many FANUC, Yaskawa and Allen-Bradley drives
- 1-year in-service warranty
What we check and replace
Most drive failures come from a small set of components that age with heat and switching. We inspect and, where needed, replace:
- IGBT and power transistor modules
- DC bus capacitors
- Rectifier diodes and pre-charge circuits
- Gate driver and control boards
- Switch-mode power supplies on the board
- Cooling fans and heatsinks
- Current sensors and feedback interface circuits
- Connectors, relays and fuses
What to send with the drive
The alarm number shown on the drive display or CNC screen, the axis it was on, and what happened just before it failed. If a motor or cable shorted, tell us. We'll check the motor too, because a failed motor can take out a new drive.