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(1) Comparative method
Compare the test data with the drawing data and normal parameters recorded at ordinary times to determine the fault. For electrical components without data and normal records, you can refer to relevant manuals or product instructions, and also compare them with the intact electrical components of the same model.
When the electrical components in the circuit belong to the same purpose or multiple components jointly control the same equipment, the actions and data of other similar or the same power supply components can be used to determine the fault.
(2) Transposition element method
In order to ensure the utilization rate of Shandong special welding machine, when the fault cause of some circuits is not easy to determine or the inspection time is too long, use the same component with good performance that can be converted on the same welding equipment to test to verify whether the fault is caused by the electrical appliance in the component.
When using the conversion element method for inspection, it should be noted that when the original electrical components are removed, carefully check whether they have been damaged. Only when it is certain that the electrical components are damaged due to their own factors, can they be replaced with new electrical components, which can prevent the new components from being damaged again.
(3) Stepwise open-circuit (or cut-in) method
When multiple branches are connected in parallel and the circuit with complex control is short circuited or grounded in the welding equipment, there are usually obvious external manifestations, such as smoke, burning traces, etc. When the circuit inside the welding machine or with a shield is short-circuited or grounded, it is not easy to find other external phenomena except the fuse is blown, which can be checked by the gradual open-circuit (or access) method.
① Step by step open circuit method: In case of a short circuit or ground fault that is difficult to check, the fuse melt can be replaced, and the multi-branch circuit and one circuit can be gradually or emphatically disconnected from the circuit, and then the power-on test. If the fuse is blown repeatedly, the fault is on the circuit that has just been disconnected. Then the branch is divided into several sections and connected to the circuit section by section. When a circuit is connected, the fuse is blown again, and the fault is on this circuit and some electrical components. This method is simple, but it is easy to completely burn the electrical components that are not seriously damaged.
② Step by step access method: when the circuit has a short circuit or ground fault, replace with a new fuse, gradually or emphatically connect each branch to the power supply step by step, and retest. When a certain section is connected, the fuse is blown again, and the fault lies in the circuit just connected and the electrical components included in the article. This article describes the inspection method and maintenance experience of welding equipment fault.
The above is the relevant content of the comparison, replacement of components and gradual opening method that can be used for the maintenance of special welding machines. If you have any doubts or needs about this, please come to our website http://www.tayfsk.com consulting service