Commercial VFD Service
VFD Fault Finding
VFD fault finding should look at the complete system: drive, motor, supply, cable, load, cooling, parameters and control interfaces.
Common fault groups
- Overcurrent and short-circuit trips
- Overvoltage and undervoltage trips
- Overheating
- Motor overload or poor torque
- Communications and control-signal faults
Diagnostic approach
- Record the exact fault code and operating condition
- Check whether the fault occurs during start, stop, acceleration, deceleration or steady running
- Review motor, cable and load condition
- Check drive cooling and environment
- Review recent parameter or process changes
Useful information
- Drive model and fault history
- Motor nameplate
- Load type
- Photos of the drive, panel and motor
- PLC, SCADA or control-system details
Related services and guides
Plan the next step
common VFD faults
Read more about common VFD faults and how it connects with vfd fault finding.
trip causes
Read more about trip causes and how it connects with vfd fault finding.
service and repairs
Read more about service and repairs and how it connects with vfd fault finding.
What to include in your enquiry
For a faster technical discussion, send the site location, drive manufacturer and model, fault code if applicable, motor nameplate photo, motor power and full-load current, supply voltage, driven equipment type, panel photos, PLC or control-system details and any shutdown constraints.
FAQs
Common questions
Does the fault code identify the whole problem?
Not always. The fault code is a starting point. The actual cause may be in the load, motor, cable, supply, cooling or control system.
What should I record before resetting a drive?
Record the fault code, time, operating state, load condition and any recent changes. This helps diagnosis if the problem repeats.