All job plans
ElectricalCorrectiveGeneral
VFD Fault Troubleshooting
Corrective workflow for diagnosing and clearing common VFD faults and trip conditions.
Estimated time
2 hours
Craft required
1 technician(s)
Skill level
specialist
Procedure steps
- 1
Record active fault code and operating conditions
~10 min - 2
Check input voltage balance and grounding
~15 min - 3
Inspect cooling fans and heat sink for blockage
~15 minLOTO required - 4
Megger motor leads if ground fault indicated
~20 minLOTO required - 5
Clear fault, test run under load, document root cause
~20 min
Safety notes
- Wait for DC bus discharge before opening drive
- Follow OEM wait time
Tools
- • Laptop / VFD keypad
- • Clamp meter
- • Multimeter
Parts
- • Cooling fan (if failed)
- • Input line reactor (if applicable)