Fault Phenomenon: Ocean marine crane when wave compensation mode is activated, the hook fluctuates severely with the waves, failing to compensate.

Troubleshooting Process:
– Checked Motion Reference Unit (MRU): sensor data zero.
– Checked compensation valve block: proportional valve coil open circuit.
– Checked control algorithm: parameters not activated.
– Replaced MRU sensor, repaired coil.

Root Cause: The Motion Reference Unit (MRU) failed, unable to provide wave data.

Required Parts: MRU sensor.