We must consider both overcurrent and fuse separately:
The user of the whole machine needs to check whether the pulse current of the circuit of the whole machine is abnormal. Two points should be considered when analyzing the problem: first, whether there is any error in the calculation at the time of model selection, the maximum pulse waveform is not captured due to the randomness of the startup pulse, the distribution range of the fuse melting heat value is not taken into account in the calculation, and the aging allowance for multiple shocks is not enough, which may cause the lack of model selection; The second is whether the circuit condition has changed during the production process. The changes in the circuit structure caused by the changes in the model, the changes in the specifications or brands of some components in the circuit, and the changes in the parameters of the components such as the capacitive inductor switch may also cause the changes in the circuit pulse waveform; The application engineer of the fuse manufacturer needs to cooperate with the user to conduct circuit technical analysis and grasp and measure the actual pulse energy, eliminate each change one by one, and both parties will analyze and evaluate together.
The fuse manufacturer needs to check and detect whether the melting heat value of the fuse is abnormal. When analyzing the problem, we should also consider from two perspectives: first, the melting heat value of this batch of fuses meets the requirements of product specifications, but due to the inter-batch distribution of product parameters, the melting heat value of this batch of products may be smaller, which is significantly different from other batches of products used in trial production or previous production; The second is that the melting heat value of this batch of fuses has exceeded the product specification requirements, or the melting heat value of some products is less than the specification range due to the large dispersion between individual products; In addition to the fuse manufacturer's analysis of the original production and inspection records and failure samples, the user of the complete machine also needs to provide on-site data for analysis.
Only through the joint efforts of both the supplier and the supplier to find the real cause of abnormal fuse fusing, can we take effective measures to solve the problem and prevent the recurrence of similar problems, so that the fuse can truly play a role in ensuring timely fuse fusing when needed, without causing trouble or even affecting production and use due to abnormal fuse fusing.
Contact Person: Mr. CK Loh
Tel: +86 188 139 15908
Fax: 86--755-28397356