Description

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　　Other names for 9905-144:

Digital speed controller 9905-144

9905-144 turbine controller

Full authority speed control module 9905-144

　　Model basics

Product series: 2301A Full Authority Speed ​​Controller with mA speed setting input.

Part number: 9905-144.

Power supply voltage: Low-voltage DC model, 10–40 Vdc control power supply.

Actuator output: 0–200 mA output for driving electric actuators on fuel or steam valves.

Speed ​​setting input: 4–20 mA (mA speed reference), or 1–5 Vdc on other closely related models (e.g., the 9905-148 series), but the 9905-144 is specifically listed in the “4–20 mA speed setting input” group.

Protection and Safety:

Starting Fuel Limitation: Prevents excessive fuel consumption during startup, reducing black smoke emissions and mechanical shock.

Fault Detection: Real-time monitoring of the magnetoresistive sensor signal triggers minimum fuel protection in case of an anomaly.

EU Directive Compliance: Complies with European safety and environmental standards.

　　Functional Characteristics

Control Mode: Full-authority constant speed control (constant speed), with droop control via an external potentiometer, thus also suitable for load balancing applications.

Prime Motor Type: Diesel engine, gas engine, steam turbine, and gas turbine; the controller adjusts the actuator current according to the required speed or load signal.

Remote Speed ​​Setting:

A 4–20 mA command (or 1–5 Vdc in other options) is sent to a dedicated terminal; internal RANGE, LEVEL, RATED SPEED/LOW LIMIT, and HIGH LIMIT potentiometers allow scaling of the signal so that the entire analog range corresponds to the entire engine speed range or a narrower frequency band.

If the external speed setting signal is lost or exceeds the permissible range, the high/low limits can force minimum speed, maximum speed, or “hold” behavior.

Speed ​​Setting: Supports 4-20mA or 1-5Vdc signals, with expandable/compressible signal range (e.g., 8-15mA extended to the full 4-20mA range).

Auxiliary Input: Compatible with load sensors, synchronization signals, etc., supports SPM input extension system functionality.

Speed ​​Sensing: Detects gear frequency via a magnetic sensor (selectable ranges such as 500-1500Hz and 1000-3000Hz), not directly corresponding to engine speed.

Output Characteristics:

Actuator Control: 0-200mA current output, impedance 30-45Ω, compatible with Woodward actuators (such as the ProAct series).

Protection Mechanisms: Fuel limit at startup, fault detection (automatic switching to minimum fuel when sensor fails), ramp time adjustment (1-22 seconds acceleration, <1 second deceleration).

Adjustment Functions:

Dynamic Calibration: Gain (response speed), reset (overshoot suppression), and actuator compensation (0-500ms dynamic matching) – three parameters work together to optimize control stability.

Speed ​​Range: Set via internal DIP switch, covering 500-12000Hz, adaptable to different mechanical frequency requirements.

Power Supply and Environment:

Power Supply: Low voltage (10-40VDC) or high voltage (88-132VAC/90-150VDC).

Environmental Tolerance: Operating temperature -40~85℃, storage -55~105℃, compliant with EU safety standards.

　　Hardware and Installation

Structure: Sheet metal chassis with a single printed circuit board; all fine-tuning potentiometers can be adjusted and calibrated from the front.

Speed ​​Sensing: Uses a magnetic pickup unit (MPU) connected to a dedicated terminal; an internal DIP switch selects the MPU frequency range corresponding to the prime mover’s operating speed.

Environment: Industrial grade; typical 2301A data specifies a vibration tolerance of approximately 4 g (5–500 Hz) and a shock tolerance of 60 g, with humidity up to approximately 95% at 38 °C.

Core Functions: The 2301A is Woodward’s digital electronic load distribution and speed controller for diesel/gas engines and steam/gas turbines, enabling precise speed or load control. It supports isochronous mode (constant speed operation) and droop adjustment via external potentiometers, and is compatible with load distribution and synchronization controls (such as SPM-A synchronizers).

Installation Requirements:

Electrostatic discharge protection required (ground before operation, avoid plastic contact with circuit board). Install away from vibration sources and high-temperature areas.

Electrical connections should use shielded twisted-pair cable. Ground the control box to ensure signal integrity.

Commissioning Procedure:

Initial Setup: Select speed range, adjust idle/rated speed, configure ramp time.

Dynamic Calibration:Optimize response and suppress overshoot/oscillation through GAIN, RESET, and actuator compensation parameters.

Troubleshooting: The manual provides detailed steps (e.g., sensor failure handling, actuator fault diagnosis).

Operating Modes and Use Cases:

Isochronous Mode: Maintains constant speed as long as the engine/turbine can handle the load; suitable for standalone units or use with load-sharing equipment.

Danger Mode: Achieved via external dangling wiring, allowing multiple units to operate in parallel on a common bus to share the load.

Integration: Compatible with Woodward synchronizers (SPM-A), load-sharing modules, and other protection or limiting controls; mA speed setting input facilitates easy connection to PLC or DCS systems. Key Internal Adjustments

Inside the 2301A with a mA speed setting input, you will find (among other components):

Range: The amount of speed reference change obtained when a given change in the 4–20 mA input is altered.

Level: Aligns the lowest portion of the external mA signal with the desired minimum speed.

Rated Speed/Low Speed ​​Limit: Sets the minimum speed allowed by the controller (up to rated speed, or reduced to idle).

High Limit: Limits the maximum speed that an external signal can demand.

These functions allow you to adjust the control, for example, to make 4–20 mA precisely correspond to “no-load to rated speed,” or to a narrower frequency band (e.g., 80–100% of rated speed), and ensure safe operation in the event of signal loss.

　　Typical Selection Point

When specifying or replacing the 9905-144 2301A:

Confirm:

Primary motor type and desired speed range (so that you can correctly set the MPU DIP switch).

Supply voltage (10–40 Vdc for this low-voltage version).

Actuator type and required current (0-200 mA output range must match actuator rating).

External speed setting signal type (4–20 mA for this model) and required scaling (range/level/high/low limits).

　　Applications and Advantages

Typical applications: Power generation equipment, marine propulsion systems, oil and gas compressors, industrial gas turbines, and other scenarios requiring precise speed/load control.

Core Advantages:

Compatibility: Supports load sharing and synchronous control; integrates with Woodward ecosystem products (such as SPM-A and ProAct drives).

Reliability: ESD protection design, fault self-diagnosis, and actuator protection functions ensure stable operation in industrial environments.

Flexibility: Adjustable speed range, ramp time, and dynamic response parameters adapt to different operating conditions.

　　Compatibility and Expandability

Accessory Compatibility: Compatible with Woodward SPM-A synchronizers, load sensors, APTL (Automatic Power Transfer and Load Control), and other accessories to expand system functionality.

Communication Interface: Supports RS232 serial port for easy integration with PLC, DCS, or SCADA systems, enabling remote monitoring and data exchange.

Summary: The WOODWARD 9905-144-2301A Speed ​​Control, with its high-precision speed control, mA-level input setting, multi-mode compatibility, and enhanced protection functions, has become an indispensable core controller in industrial power systems, especially excelling in power generation, marine, oil and gas, and distributed energy fields, ensuring stable and efficient operation of equipment under complex conditions.

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