Fault Phenomenon: Komatsu 830E mining truck cannot move, instrument reports inverter fault.
Troubleshooting Process:
– Checked IGBT: inverter power module shorted.
– Checked driver board: driver circuit board damaged.
– Checked cooling: water cooling system leaking or poor heat dissipation.
– Checked motor: traction motor windings shorted.
Root Cause: The inverter IGBT module shorted due to overheating or voltage spike, causing the inverter to lock out for protection.
Required Parts: Replace inverter IGBT module and driver board.