时间继电器作用：
Time relay action:
当加上或除去输入信号时，输出部分需延时或限时到规定的时间才闭合或断开其被控线路的继电器。用于精确的控制某个机械设备或者元器件产品。
When the input signal is added or removed, the output part needs to be delayed or limited to the specified time to close or disconnect the relay of the controlled line. For the precise control of a mechanical device or component products.
1、时间继电器的电源回路一般情况下是高阻抗的，因此，切断电源后的漏电流要尽可能小（半导体或用rc并接的触点来开关时间继电器），以免有感应电压而假关断引起误动作（对于断电延时型而言，会产生断电后延时时间到但继电器不释放现象）。
In general, the 1 power supply circuit time relay is a high impedance, therefore, cut off the leakage current after the power to be as small as possible (with RC and semiconductor or connected to the contact switch, a time relay) to avoid induction voltage and false shutdown caused by misoperation (for power-off delay type, will delay time after the power to relay but does not release the phenomenon).
2、一般情况下电源端子的残留电压应小于额定电压的20%，对断电延时型而言应小于额定电压的7%。 时间继电器在完成其控制工作后，尽量避免继续通电。到时后连续通电会使产品发热，从而加快电子元件老化，大大缩短使用寿命。
2. Under normal circumstances, the residual voltage of the power terminal should be less than 20% of the rated voltage, and the delay time of the power supply should be less than 7% of the rated voltage. After the completion of the control of the relay, as far as possible to avoid continued power. When continuous electricity makes the product heat, thus speeding up the aging of electronic components, greatly shorten the service life.
