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由图1可知,当导频电平不正常(或中断)时,BG_8导通(正常时BG_8截止),WY_2导通地气,通过BG_8、WY_2形成告警回路,使告警喇叭响,告警灯D亮,发出告警信号。切断警(即K_1断开)时,导频告警电源断,告警停止、D灭。当导频恢复正常时,BG_8截止,告警回路由于电源中断不能给值班同志可闻信号,这样就不能及时还原电路,延长了障碍历时。造成障碍历时增长,不能如实反映指标完成情况。笔者在原电路基础上稍加改进就可克服上述缺点。改后电路如图2。
It can be seen from Figure 1 that, when the pilot level is abnormal (or interrupted), BG_8 is turned on (BG_8 is turned off normally) and WY_2 is turned on. By means of BG_8 and WY_2, an alarm loop is formed to make alarm horn ring and alarm lamp D Light, alarm signal. Cut off the alarm (ie, K_1 off), the pilot alarm power off, alarm stop, D off. When the pilot to restore normal, BG_8 deadline, the alarm loop because the power outage can not be on duty to hear signals, so that you can not restore the circuit in time, extending the barrier lasted. As a result, barriers have been increasing over time, and the completion of the indicator can not be accurately reflected. The author on the basis of the original circuit can be slightly improved to overcome the above shortcomings. After the circuit shown in Figure 2.