Fault Phenomenon: Caterpillar 793 electric wheel mining truck instrument reports “Ground Fault,” machine cannot move.

Troubleshooting Process:
– Checked cables: high-voltage cable insulation damaged, short to frame.
– Checked motors: traction motor winding insulation degraded.
– Checked resistor grid: resistor grid insulators cracked.
– Checked sensor: ground detection sensor false alarm.

Root Cause: The traction motor cable insulation wore through due to long-term vibration, causing high voltage to short to the vehicle frame.

Required Parts: Replace damaged high-voltage cable, repair motor insulation.