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我台29频道康特发射机出现故障,故障现象:开机后主交流接触器无反应,整机不供电。查到缺相保护器APR-3有问题,APR-3的内部流程图如图1所示。APR-3缺相保护器共8脚,其中5、8脚常闭,1、5脚常开,在三相交流电分别从6、4、3脚正确输入的条件下,1、5脚接通,则风机继电器得到12 V电压吸合,控制主交流接触器吸合,风机运转的同时接通末级功放继电器。查6、4、3脚三相交流电输入正常,APR-3灯亮,
My Channel 29 Channel Conte transmitter failure, failure phenomenon: After the main AC contactor boot no response, the whole does not power. Check the phase failure protection APR-3 problems, APR-3 internal flow chart shown in Figure 1. APR-3 phase loss protector a total of 8 feet, of which 5,8 feet normally closed, 1,5 feet normally open, respectively, in the three-phase AC input from 6,4,3 feet correctly, under the conditions of 1,5 feet connected , Then the fan relay 12 V voltage pull-in, control the main AC contactor pull, fan operation at the same time connected to the final stage power amplifier relay. Check 6,4,3 feet three-phase AC input is normal, APR-3 lights,