REXA SMB9215-1E-1-7725 Servo Actuator Module

High-Precision Control: Adopts a closed-loop feedback system with positioning accuracy up to ±0.5%, meeting the needs of precise adjustment.

Rapid Response: Dynamic response time ≤50ms, suitable for emergency conditions requiring real-time adjustment (e.g., pressure and flow control).

Wide-Range Input: Supports standard control signals such as 4-20mA/0-10V, compatible with various PLC/DCS systems.

Multiple Protection Mechanisms: Equipped with overcurrent, overvoltage, overload, overheat protection, and mechanical limit functions to avoid equipment damage.

Anti-Interference Design: Built-in EMI filtering and shielding structure ensures stable operation in strong electromagnetic interference environments.

Easy Maintenance: Supports on-site manual operation and remote diagnosis, with LED indicators showing operating status for convenient fault troubleshooting.

Environmental Adaptability: Protection level reaches IP66, resistant to dust, rain, and high-pressure washing, with an operating temperature range of -40°C to +70°C.

Input Signal Analysis: The module receives 4-20mA or voltage signals (representing target position commands), which are filtered and amplified by the signal conditioning circuit, then converted into digital signals and sent to the microprocessor (MCU).

Feedback Signal Collection: The built-in position sensor (such as potentiometer, encoder) real-time detects the current position of the actuator, converts it into an electrical signal, feeds it back to the MCU, and generates an error signal by comparing it with the input command.

Servo Motor Drive: The MCU generates PWM (Pulse Width Modulation) drive signals based on the error signal, controlling the power amplifier (such as MOSFET/IGBT) to drive the servo motor (brushless DC or stepper motor) to operate.

Mechanical Transmission: The motor converts rotational motion into linear/rotational output through a gearbox, lead screw, or crank-link mechanism, driving the load (such as a valve) to act. Take the rotary type as an example:
Motor → reduction gear set → output shaft → valve shaft, amplifying torque through the gear ratio.

PID Control Algorithm: The MCU performs PID (Proportional-Integral-Derivative) operation based on the error signal, dynamically adjusting the motor speed and direction to make the actuator position quickly track the command value.

Position Locking Mechanism: When the actuator reaches the target position, the servo motor is powered off or enters the "hold" mode, maintaining the position through mechanical braking or motor stall torque to avoid offset due to load fluctuations.

Real-Time Monitoring Circuit: The operating status of the module is real-time monitored by current sensors, temperature sensors, and voltage detectors. When overcurrent (such as load jamming), overheat (≥85℃), or voltage abnormality occurs, the MCU immediately cuts off the drive signal and triggers protection.

Fault Feedback: Fault codes (such as "E01" for overcurrent) are output through the communication interface or indicator lights for convenient on-site maintenance.