AC Drive and VFD Repair
Component-level repair for AC drives, VFDs, inverters, and motor controllers used in continuous production lines.
Assemblies We Commonly Check
- Input rectifier
- DC bus
- IGBT module
- gate driver
- SMPS
- control card
- keypad
- fan and thermal section
Frequent Fault Symptoms
- No display
- over current
- under voltage
- earth fault
- DC bus trip
- output phase loss
- parameter corruption
SES Testing Workflow
Incoming visual and insulation check
DC bus and pre-charge verification
gate pulse and IGBT leakage test
load or motor simulation
parameter backup and final burn-in
Industries Supported
Packaging, CNC machines, textile, printing, HVAC, water treatment, steel and process lines.
Brands Often Seen
ABB, Siemens, Danfoss, Schneider, Mitsubishi, Yaskawa, Delta, Fuji, Lenze, Control Techniques.
SES Automations is an independent repair company. Brand names are used only to identify compatible equipment and service experience.
When to Send the Unit for Diagnosis
Send the unit when the fault repeats after machine-side checks, when there is visible burn damage, when a safety or production-critical machine is down, or when the part is obsolete and replacement lead time is high.
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