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It depends on the functionality of your overhead crane and the nature of a problem. It might be electrical or mechanical or control HW or control SW problem. Once you can identify according to URS how your crane has to do operations, it will be easy to find the stage within the control software, which is responsible for the certain operation during your crane broke down/stopped functioning. You must have an operator console indicating the crane operation stages and malfunctions as well. If you do not have such hw, you can not operate your overhead crane safely. Basically, the question contains at least million of possible reasons, why the OVH crane breaks down. You will need to conduct detailed analyze of all above mentioned troubleshooting actions. Act and think logically and wise and you will find the problem...
