推荐回答（1个）
随着应用的不断推广，康沃品牌越来越深受用户欢迎，为让用户进一步了解康沃变频器，方便用户使用，现将康沃变频器在使用中常出现的故障及处理方法进行介绍。 故障代码ER02/ER05表示变频器在减速中出现过流或过压故障，主要原因为减速时间过短、负载回馈能量过大未能及时被释放。若电机驱动惯性较大的负载，当变频器输出频率（即电机的同步转速）下降时电机的实际转速可能大于同步转速，这时电机处于发电状态，部分能量将通过变频器的逆变电路返回到直流回路，从而使变频器出现过压或过流保护。现场处理时，在不影响生产工艺的情况下可延长变频器的减速时间，若负载惯性较大又要求在一定时间内停机时则要求加装外部制动电阻或制动单元。康沃G2/P2系列变频器22kW以下的机型均内置制动单元，只需加外部制动电阻即可，电阻选配可参考产品说明。对于功率22kW以上的机型则要求外加制动单元和制动电阻。
ER02/ER05故障一般只在变频器减速停机过程中才会出现，如果变频器在其它运行状态下出现该故障，则可能为变频器内部的开关电源部分如电压检测电路或电流检测电路异常而引起。 代码ER17表示电流检测故障，通用变频器电流检测一般采用电流传感器，如图2中H1和H2所示。通过检测变频器两相输出电流来实现变频器运行电流的检测、显示及保护功能，输出电流经电流传感器输出线性电压信号，经放大比较电路处理后输出到CPU处理器，CPU处理器根据其电压大小判断变频器是否处于过电流状态，如果输出电流超过保护值，则故障封锁保护电路动作封锁IGBT脉冲信号，实现保护功能。
[康沃变频器出现ER17故障主要原因为电流传感器故障或电流检测放大比较电路异常，前者可通过更换传感器解决，后者大多为相关电流检测IC电路或IC芯片工作电源异常，可通过更换相关IC或维修相关电源解决。 代码ER15表示逆变模块IPM、IGBT故障，主要原因为输出对地短路、电机线过长（超过50米）、逆变模块或其保护电路动作。现场处理时先拆去电机输出线，测量变频器逆变模块，观察输出是否存在短路，同时检查电机是否对地短路及电机线是否超过允许范围，如上述均正常则可能为变频器内部IGBT模块驱动或保护电路异常。一般IGBT过流保护是通过检测IBGT导通时的管压降动作的。
当IGBT正常导通时其饱和压降很低，当IGBT过流时管压降VCE会随着短路电流的增加而增大，IGBT驱动保护电路通过二极管DB可测量饱和压降，并经过处理电路传送给CPU处理器，同时封锁IGBT输出达到保护作用。如出现Er15故障，现场处理时可更换驱动模块或检修相关电路。 康沃变频器出现ER11故障表示变频器过热，可能原因主要有：风道阻塞、环境温度过高、散热风扇损坏及温度检测电路异常。现场处理时先判断变频器是否确实存在温度过高情况，如果温度过高可先按以上原因排除故障；若变频器温度正常，下出现ER11报警则则可能为为温度检测电路故障。康沃22kW以下机型采用的七单元逆变模块，内部集成有温度元件，如果模块内此部分电路故障也会出现ER11报警，另一方面当温度检测运算电路异常时也会出现同样故障现象。
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