Description
REXA SMB9215-1E-1-7725
Technical Specifications Brand: Rexa Model: SMB9215-1E-1-7725 Command Input: 4-20mA analog control signal Position Feedback: 4-20mA valve stroke feedback signal Power Supply: 24 VDC Communication: Local HMI interface and fault relay output Operating Temperature: -40°C to +70°C Humidity: 5% to 95% non-condensing Mounting: Direct mounting on actuator body enclosure Protection Grade: IP65
Functional Features Receives 4-20mA setpoint signal from upper control system and converts to valve position command. Processes valve stroke position feedback signal for closed-loop position control. Drives internal hydraulic servo valve to adjust oil flow and valve opening. Built-in fault diagnosis detects position deviation, servo valve failure and power abnormality. Local HMI supports parameter setting, stroke calibration and status viewing. Relay output transmits actuator fault and ready status to host control system. Over-travel protection prevents mechanical damage to valve and actuator.
Application Scenarios Oil refinery control valve actuation, chemical plant flow and pressure regulating valves, power plant steam valve control, natural gas pipeline pressure regulation.
Performance Parameters High positioning accuracy for valve stroke adjustment. Fast response to setpoint signal change for process variable regulation. Stable closed-loop control under fluid load disturbance. Accurate fault detection of actuator and valve assembly abnormalities. Wide temperature operating range adapts to outdoor field installation.
Material Composition Module Housing: Reinforced flame-retardant plastic. PCB: FR4 multilayer printed circuit board with heavy-duty conformal coating. Core Components: Microcontroller, analog signal conditioning chips, servo drive circuit, surge protection components. Terminals: Tin-plated copper screw terminals sealed inside housing. Sealing Parts: EPDM rubber gaskets for enclosure waterproof sealing.
Structural Features Rectangular sealed module assembly designed for direct installation inside actuator housing. External cable entry ports with cable gland sealing structure. Internal PCB fixed to housing base with mounting screws. HMI display and operation buttons located on module front face. Fully sealed structure prevents ingress of dust, rainwater and moisture.
Working Principle The module receives 4-20mA setpoint signal representing target valve opening from the control system. The onboard controller compares target setpoint with actual valve stroke feedback signal. The controller outputs drive signal to hydraulic servo valve, adjusting hydraulic oil flow to move actuator piston and change valve opening. Position feedback sensor continuously sends real stroke value back to module. Diagnostic circuits monitor control loop status and trigger fault alarm once position deviation or hardware failure appears.
Installation Requirements Mount module inside Rexa electro-hydraulic actuator enclosure. Tighten cable glands properly to maintain enclosure waterproof integrity. Connect 4-20mA command signal, position feedback wiring and 24 VDC power supply to corresponding terminals. Perform valve stroke calibration after wiring completion. Shielded twisted pair cable used for analog signal wiring, single point shield grounding. Keep module away from high temperature hot surfaces of valve body.
Usage Notes Cut off 24VDC power supply before opening module enclosure. Do not apply voltage outside specification to signal terminals. Check cable gland sealing regularly for outdoor field units. Perform stroke recalibration after valve mechanical maintenance. Protect module housing from mechanical impact during field maintenance.
