As shown in the figure, a motor speed control circuit using an AC tachometer sensor. The speed of the motor is determined by C3 and so on according to the resistance of R2 and RP. Speed ​​N=1/[1*17(R2+RP)C3P]. where N is the rotational speed and P is the number of pulses generated by one revolution of the motor. The R3 and C3 parameters depend on the characteristics of the selected electrode. The output transistor is selected based on the motor power.
The AC power meters are applicable to the measurement of single-phase or three-phase
voltage and current parameters of distribution system. The transformation ratio of this series of meters is programmable. They supports digital input, relay output, analog output and communication functions. They provide a variety of different installation sizes and can directly replace the analog pointer ammeter.
Ac Power Meter,Led 3 Phase Current Panel Meter,Ac Digital Electric Power Meter,Ac Multifunction Meter
Jiangsu Sfere Electric Co., Ltd , https://www.elecnova-global.com