Woodward 5501-467 Actuator Control Module

Receives analog signals (4-20mA current or 1-5V voltage) from controllers (such as PLC, DCS) for setting target speed, load, or valve position.

Supports discrete input (such as switch signals, relay contacts) for start-stop control or mode switching.

Eliminates external electromagnetic interference through optoelectronic isolation circuits to ensure signal stability; uses filter circuits to remove high-frequency noise and avoid misoperation.

Input signals are converted by analog-to-digital (A/D conversion) and then transmitted to the microprocessor for processing.

The built-in microprocessor compares input signals and feedback signals in real time, calculates deviation values based on preset control algorithms (such as PID regulation), and generates control instructions.

Isochronous Regulation: Used for constant speed control (such as single-unit operation or isolated power grid) to ensure the output is stable at the set value.

Droop Regulation: Suitable for parallel operation of multiple units, realizing load distribution or speed collaborative control by adjusting deviations.

The built-in memory can store control parameters (such as thresholds, regulation gains), supporting remote configuration or local debugging through upper computer software (such as Woodward ProAct).

The digital control signal output by the microprocessor is converted into analog quantity through digital-to-analog (D/A conversion) to drive electro-hydraulic servo valves or proportional electromagnets.

The electro-hydraulic servo valve adjusts the flow or pressure of hydraulic oil according to the current size, pushing the actuator (such as hydraulic cylinder, speed governor lever) to act, thereby controlling engine throttle, steam turbine valve, etc.

The maximum output driving current can reach 200mA (some models support higher), and the load resistance is matched according to the current demand (such as maximum load resistance = 10Ω / maximum current).

Supports dual-channel output (redundant design) to improve system reliability, and automatically switches to the other channel when one channel fails.

The position of the actuator is real-time monitored through linear variable differential transformer (LVDT) or potentiometer, and converted into electrical signals (such as voltage or current) to feedback to the module.

The microprocessor compares the feedback signal with the input set value, and adjusts the output of the electro-hydraulic servo valve if there is a deviation until the position of the actuator is consistent with the set value, realizing no-static-error control.

At 25°C, the position accuracy can reach 0.25% of the full scale, and the output current tolerance is ±1% to ensure control accuracy.

Temperature compensation mechanism: monitor the ambient temperature through the built-in thermal element, and automatically adjust parameters to compensate for the influence of temperature changes on performance (operating temperature range: -20°C~70°C, LT type can reach -40°C).

Dual power inputs: +5V@0.5A (logic power) and +24V@1A (driving power), supporting power redundancy design to avoid out-of-control caused by power failure.

Overcurrent and overvoltage protection circuits: prevent power anomalies from damaging internal components;

Watchdog timer: monitor the operating status of the microprocessor, and automatically reset if the program is abnormal to ensure system safety.

Real-time Diagnosis Function:

Fault Log and Communication: