The mechanical components of the stacker cranes and the pallet conveyor system were mostly in good condition and could be kept in operation after the maintenance. Except the bad conditions of the guidance rails and the wheels of the three stacker cranes; they had to be replaces. The drive systems of the three stacker cranes axes were also still in DC technology, the DC motor controller were discontinued. The switchboards of the stacker cranes included a lot of obsolete components had to be urgently brought on a safety and modern state; the hardware and software had to be renewed.
The positioning of the X- and Y-axis was dissolved mechanically and was no longer state-of- the-art. The positioning systems that interact together with the new AC drives, had to be replaced by modern electronic instrumentation. The existing concept of the control of the stacker cranes via a data concentrator (DAKO) was no longer needed; a new PC-based MFC was necessary to replace the old MFC and DAKO.