Crane Control Circuit Replacement

2 Pages

CASE STUDY Challenge/objectives Following two separate uncontrolled lowering incidents our customer had serious concerns about the PLC (Programmable Logic Controller) system on their on board A/S Hydralift cranes. All three cranes on board were hydraulically powered from the central hydraulic power unit through couplings in the crane king posts. Investigations highlighted a previous upgrade of a control cab from a different OEM on one

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