SST-PFB3-VME Valve Position Feedback Signal Line

SST-PFB3-VME electric actuator in the control process can not obtain some of its own characteristics parameters, making the control accuracy and reliability are not high, the input signal is only one, such as current or resistance, and then the detection signal and the input signal to compare the control signal obtained from this to the drive circuit to control the displacement output of the actuator; some electric actuators are set up in the Although some electric actuators have alarm circuits, there are no chain protection measures, so that there is still insecurity in the alarm state, and thus such servo amplifier most of the control of the electric actuator in some of the precision, reliability and stability requirements of the higher occasions can not be applied.

SST-PFB3-VME electric actuator generally provides 5 signal points: 1 analogue signal to feedback the position signal of the electric actuator; 2 switching contact input signals to feedback the 2 limit alarm signals of the electric actuator; in addition, there are 2 forward and reverse coil drive interfaces for connecting the power devices, such as solid state relays, SCRs and so on, servo amplifier or PAT module. The PAT module can drive the solid state relay or thyristor through the switching output signal, so as to drive the forward or reverse rotation of the electric actuator.

SST-PFB3-VME electric actuator applications are generally worse, and in the industrial field for the convenience of engineering implementation, the valve position feedback signal line, power supply line and the switching output signal line is concentrated in the same cable, the signal line crosstalk is serious, so the hardware of the PAT module must be in the isolation, anti-jamming, and electromagnetic compatibility to do a rigorous design [2]. PAT module design adopts photoelectric isolation technology and electromagnetic isolation technology, analogue processing circuits are isolated separately, and the switching part is isolated uniformly. The switching output part is then isolated from weak and strong power by solid state relay, effectively overcoming the interference between different signals.