Cause:
- When the unload cylinder is raised during an unload, if the unload cylinder has not left the
lowered (extended) position within unload_delay seconds then this error is generated.
- In the ale_lower_unload() function the error is generated if the unload cylinder has not arrived at the
lowered (extended) position withing unload_delay seconds. ale_lower_unload() is used during initialisation,
unload, process and time table.
- In the ale_raise_unload() function the error is generated if the unload cylinder has not arrived at the
raised (retracted) position withing unload_delay seconds. ale_raise_unload() is not used as this time.
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