L68B2 Mast Section Technical experience in Derrick electrical failure
1. Identify the location of electrical malfunctions by questioning the operator on site To understand the operation of master control system, lifting system, rotary system, luffing system, cart running system and other parts of the operation, clear the priority, remove some doubtful points, find out the system may have faults. Using the method of observation, spring pressing and knocking to remove obvious electric trouble, the methods are as follows: Open the electric cabinet, check whether the electric appliance has obvious damage, scorch and connection line looseness, etc.
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Then check the contactor armature, various travel limit switch on the wheel, start brake button sensitivity. If it is confirmed that everything is OK, a rubber hammer can be used to knock on the working components, especially the moving parts, when the tower crane is electrified. If the circuit fault suddenly disappears, it indicates that there is bad contact between the percussion element and the percussion element, which should be eliminated immediately. Using short connection method and component replacement method to solve the electric fault quickly, that is, according to the electrical schematic diagram, the suspicious circuit parts are connected in turn to verify whether the other parts of the system are normal or not. If the other parts are normal, the fault will exist in the components of the short part. At this time, the same components in other systems in the main control cabinet can be removed and the faulty components can be replaced If the trouble-shooting means that the replacement of the component has been damaged.
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