隔膜阀电路图
Diaphragm Valve Wiring Schematic

　　所显示的执行器位于开启位置
　　Actuator shown in open position
　　电源通往#1和#2时开启
　　Power to #1 & #2 To Open
　　电源通往#1和#3时关闭
　　Power to #1 & #3 To Close

　　工作原理：断路点设置在执行器额定扭矩上。设置时间延迟以避免由于瞬间起峰电流而引起断路。
　　Operation: Trip point is set at actuator rated torque. Time delay is set to avoid trip due to inrush current.
　　当执行器扭矩过载或处于失速状况时，则电流将增加，并被电流传感器检测到。当超过断路点时，传感器将电压加在关闭继电器线圈上。这个继电器将对状态进行改变（从NC接点到NO接点），这将导致继电器关闭和中断通往PSC双向电机的电流。在导致电流过载的故障排除之前，执行器将不会完成循环动作。
　　When the actuator is over torqued or in a stall condition, the current draw increases and the current sensor detects the increase. Upon exceeding the trip point, the sensor applies voltage to the coil of the latching relay. The relay changes state (from NC contact to NO contact) which causes relay to latch and breaks power to the PSC reversing motor. The actuator will not complete its cycle until the cause for excessive current is fixed.
　　图示中的电路图连接加热器，温度调节装置和辅助开关（都是备选件）。
　　This wiring diagram illustrates connection for heater, thermostat and auxiliary switches (all optional).