从波兰引进OW—1202开关中的PSN型电机综合保护装置(以下简称PSN),外商不提供图纸资料。近一、二年来,它的损坏率较高,究其原因,大多数是使用和维修不当所致。电子组件的维修,必须在吃透原理,了解技术性能,掌握测试手段的基础上,才能得心应手地完成。维修引进电子组件,还需因地制宜,立足于国内产品条件和自制能力,在保证原机性能的前提下,要敢于改革,勇于创新。这样才能摆脱长期对外商的 Imported from Poland OW-1202 switch in the PSN-type motor integrated protection device (hereinafter referred to as PSN), foreign companies do not provide drawings and materials. Nearly one or two years, its higher damage rate, the reason, most are due to improper use and maintenance. The maintenance of electronic components, must be eaten through the principle of understanding of technical performance, to master the test means, based on the handy to complete. Maintenance of the introduction of electronic components, but also according to local conditions, based on domestic product conditions and self-control capabilities, to ensure the performance of the original machine under the premise, dare to reform, the courage to innovate. In order to get rid of long-term foreign investors