Product Details：

  Woodward 5421-123 is a microprocessor-based 505E digital turbine controller, developed for single extraction or admission steam turbine units. It supports three closed control loops for turbine shaft speed, generator load and extraction header pressure, and adopts a mature decoupling control algorithm to reduce the mutual coupling influence between speed loop and pressure loop, so the unit can maintain stable power output while stably supplying process steam for downstream production. This controller collects speed pulse signals from magnetic pickups, 4-20mA analog signals of extraction pressure, temperature and flow, as well as dry-contact discrete trip and interlock feedback signals from field safety switches. It outputs two independent actuator drive signals to control the main steam valve and extraction/admission valve respectively, dynamically adjusting valve opening according to the deviation between actual process value and setpoint to balance steam distribution of the whole turbine system. The front panel integrates a two-line 24-character LCD display and membrane function keypad. Operators can configure startup acceleration ramp, idle speed, rated speed, extraction pressure setpoints and alarm thresholds, view first-out fault records, and perform local start, stop and reset operations directly on site. It is equipped with abundant configurable I/O resources, including multi-channel analog inputs, analog outputs, discrete inputs and discrete outputs, which can connect emergency trip systems, lubricating oil pressure switches, vibration transmitters and safety interlock relays. It supports RS232 and RS422 serial communication based on Modbus protocol, realizing bidirectional data exchange with DCS and SCADA systems for remote monitoring, parameter modification and remote control command reception. It integrates independent overspeed protection logic and comprehensive multi-dimensional hardware self-diagnosis function. It can detect speed signal loss, actuator feedback deviation, module power failure and internal hardware abnormality, trigger alarm and safe trip action according to preset protection sequence, avoiding turbine overspeed and overpressure equipment damage. It adopts standard panel mounting structure, suitable for installation in turbine local control cabinet and central control room. It is widely used in petrochemical, chemical, paper making and cogeneration plants equipped with single extraction or admission steam turbines, used for control system renovation, old mechanical governor upgrade and spare parts replacement. It is a stable multi-variable control solution for extraction steam turbine units.

  Key specifications：Woodward 5421-123 505E extraction turbine controller,24VDC power supply,dual independent actuator outputs,single extraction/admission pressure closed-loop control,Modbus RS232/RS422,local LCD keypad,panel mount. Operating temperature range: -20°C to +60°C. It supports speed loop calibration, extraction pressure PID tuning, actuator stroke test and communication configuration verification during maintenance.

  This 505E controller cooperates with magnetic pickups, hydraulic actuators and field transmitters to build stable speed-load and extraction pressure closed-loop control system. The front HMI panel helps operators monitor running data and tune control parameters conveniently.