L48A1 Mast SectionUsing the practical experience, the fast elimination tower crane electrical breakdown method
tower crane electrical breakdown method 1 uses the inquiry segmentation method to determine the electrical breakdown position, that is, by asking the operator on the spot, to understand the operation of the master control system, the lifting system, the rotary system, the luffing system, the cart running system and other parts of the operation, to distinguish the primary and secondary, to eliminate some doubtful points, to find out the system that 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 you are sure that everything is OK, you can use a rubber hammer to hit 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. For example, when a QTZ80 tower crane is lifting and lowering under light load, all is normal, and when it is overloaded, I, II and IV gears are also normal, but there is no III gear, because there is no transition gear III between low speed I gear and high speed IV gear during lifting under heavy load When the tower crane changes speed, the impact is very big, the tower body produces the violent shaking, affects the human-machine safety, must eliminate immediately. So first open the main control cabinet, find the lifting system, check the appearance, no obvious damage, scorch and loose connection wire phenomenon. As the YBHE Eddy current and Khl should be normal when the I and II barriers are normal, figure 1 The contactors and time relays Khe, KTH1, Khu, Khb, KTH2, Khj, Khl , KTH3, KL, KTH5, Kh2, KTH6, KH3 in the main control cabinet are operated in turn, but the lifting speed is not changed obviously.
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