The F081 fault was showing at the drive panel. It didn't show a regular pattern since it occurred both during movement of skips and when they were stopped at discharge position.
Figure 1. F081 fault.
First day we of course started by checking all emergency push buttons in the drive, PA console, at the LD and LL panels. Nothing wrong here and fault still happening.
Second day we checked drive inverter modules since Drive Windows' fault log showed a START INHIBI fault. This fault is (according to the manual) is linked to the ASTO control board. We check the drive modules and cleaned them up but fault still happening.
Figure 2. SYSTEM START fault
Figure 3. START INHIBI fault.
We finally checked PA.1 fault log again. We noticed that it showed a list of faults that are not really linked each other in the field. Kevin (one of the electrical guys here) then found a diagram that showed most of the components in the fault list. It was the one that shows connections of power sources at the AHC panel. We switched them off and voilà! we got same fault list. New power sources were installed and there was no problem since then. So please consider to change or upgrade your power sources every 4 years.
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Figure 5. New power sources installed.
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