四:SEW变频器维修实例
SEW变频器维修实例一:7。5KW
故障现象:显示POFF(欠压故障)
故障分析:接入直流电源电压,面板上没有显示POFF(欠压故障),只有上交流测试了,测量三相相正常,直流母线电压也正常。这属于一种假欠压故障,问题可能出在板上的电压检测保护电路。首先检查电压取样电阻,测量三个电阻基本上未变化,查一个C46电容有较严重的漏电现象。
故障原因:SEW变频器采用了电阻分压式,C46并联在R36上,电容在这里主要是起缓冲变化作用,由于电容老化有漏电现象,这就相当于给电阻再并联了一个电阻,使取样电压减小,出现了欠压故障。
故障处理:更换贴片电容就行了。
SEW变频器维修实例二:
故障现象:运行SEW变频器报“OUS”软件过压
故障分析:用万用表二极管档,测量SEW变频器整流电路和逆变电路没有问题,直流母线电压也正常,说明故障出在功率板上,把功率板拆下来,用小直流测试,运行就报“OUS”,说明我的认定没错。
故障原因:取下功率板目测到有一个驱动电阻R96(12R/1W)有被烧焦的痕迹,用万表测量这个电阻断路,然后检测快恢二极管“DV45VH10C”也有断路现象,进一步测量快恢二极管附近电路,发现一个贴片电容C208(0。01UF)有断路,取下贴电容,断路现象就没有了。说明是这个电容老化了,所以才会造成这种故障。
故障处理:更换贴片电容,机器运行正常。
SEW变频器维修型号:
SEW变频器MC07B系列型号
MC07B0003-5A3-4-00 MC07B0004-5A3-4-00 MC07B0005-5A3-4-00 MC07B0008-5A3-4-00 MC07B0011-5A3-4-00 MC07B0015-5A3-4-00 MC07B0022-5A3-4-00 MC07B0030-5A3-4-00 MC07B0040-5A3-4-00 MC07B0055-5A3-4-00 MC07B0075-5A3-4-00 MC07B0110-5A3-4-00 MC07B0150-5A3-4-00 MC07B0220-5A3-4-00 MC07B0300-5A3-4-00 MC07B0370-5A3-4-00 MC07B0450-5A3-4-00 MC07B0550-5A3-4-00 MC07B0750-5A3-4-00
SEW变频器MCF41A系列型号
MCF41A0015-5A3-4-00 MCF41A0022-5A3-4-00 MCF41A0030-5A3-4-00 MCF41A0040-5A3-4-00 MCF41A0055-5A3-4-00 MCF41A0075-5A3-4-00 MCF41A0110-5A3-4-00 MCF41A0150-5A3-4-00 MCF41A0220-5A3-4-00 MCF41A0300-5A3-4-00 MCF41A0370-5A3-4-00 MCF41A0450-5A3-4-00
SEW变频器MCH41A系列型号
MCH41A0015-5A3-4-00 MCH41A0022-5A3-4-00 MCH41A0030-5A3-4-00 MCH41A0040-5A3-4-00 MCH41A0055-5A3-4-00 MCH41A0075-5A3-4-00 MCH41A0110-5A3-4-00 MCH41A0150-5A3-4-00 MCH41A0220-5A3-4-00
SEW变频器MCS41A系列型号
MCS41A0015-5A3-4-00 MCS41A0022-5A3-4-00 MCS41A0030-5A3-4-00 MCS41A0040-5A3-4-00 MCS41A0055-5A3-4-00 MCS41A0075-5A3-4-00 MCS41A0110-5A3-4-00 MCS41A0150-5A3-4-00 MCS41A0220-5A3-4-00
MCS41A0300-5A3-4-00 MCS41A0370-5A3-4-00 MCS41A0450-5A3-4-00