Fault Phenomenon: ZPMC port quayside crane during long-distance trolley travel, the drive wheels on both sides move at different speeds, causing the trolley to skew.

Troubleshooting Process:
– Checked motor speed feedback on both sides: significant deviation in feedback signals.
– Checked encoders: one side’s encoder coupling loose.
– Tightened encoder coupling and recalibrated synchronization parameters.

Root Cause: Loose mechanical connection of the speed feedback encoder caused the control system to misjudge speed.

Required Parts: Encoder coupling.