Description

Product Overview

The Woodward 9907-1200 is a specialized Electronic Control Module (ECM) or Engine Interface Board designed for integration within Woodward’s ProTech or EasyGen series of generator set (genset) control and protection systems, or as a critical component in their industrial engine speed governing systems. This module functions as the intelligent, high-reliability interface between the engine/generator’s physical hardware (sensors, actuators) and the system’s main processor. It is responsible for acquiring critical analog and digital signals (such as speed pickups, temperature sensor inputs, pressure switch statuses) and converting them into clean, conditioned digital data for the control algorithm. Simultaneously, it receives output commands (for fuel rack positioning, relay activation, etc.) and drives the appropriate field devices with the required power and isolation. Engineered for harsh environments, this module ensures the integrity of the measurement and control signals, forming the dependable sensory and actuatory foundation upon which precise engine speed control, synchronization, and protection depend.

Technical Specifications

Parameter Name	Parameter Value
Manufacturer Part Number	9907-1200
Manufacturer	Woodward
Associated System	ProTech Speed Control Systems, EasyGen Gen-Set Controls, or similar Woodward engine/governor controls.
Module Type	Electronic Control / Interface Module (I/O Processor)
Primary Function	Signal conditioning, isolation, and interfacing for engine/generator sensors and actuators.
Typical Inputs	<ul><li>Speed Sensing: Magnetic pickup (MPU) inputs for engine/generator speed.</li><li>Analog Inputs: 4-20mA, 0-10V for temperature, pressure.</li><li>Discrete Inputs: Dry contact status for switches (oil pressure, temperature).</li><li>Power Supply Monitoring.</li></ul>
Typical Outputs	<ul><li>Actuator Drives: Signals for electric or hydraulic actuators (EGB/PEGA).</li><li>Relay Drivers: For contactors, alarms, and breaker control.</li><li>Analog Outputs: 4-20mA for metering or auxiliary control.</li></ul>
Isolation	Signal isolation between field wiring and control logic for noise immunity and protection.
Communication Interface	Likely connects to the main CPU board via a proprietary backplane or high-density connector.
Power Supply	Powered from the system’s internal DC power supply (e.g., 24V).
Form Factor	Printed Circuit Board (PCB) designed to install in a dedicated slot within a Woodward control chassis.
Environmental	Designed for industrial temperature ranges and vibration resistance.
Diagnostics	Status LEDs and internal fault detection.

Main Features and Advantages

Robust Signal Integrity in Noisy Environments: The 9907-1200 is engineered to operate reliably in the electrically hostile environment near engines and generators, which are rich in electromagnetic interference (EMI) and voltage transients. It provides high-grade filtering and isolation on its input channels, ensuring that speed signals and sensor readings are accurate and free from noise that could cause erratic control behavior or nuisance trips.

Dedicated, Deterministic I/O Processing: By offloading the time-critical tasks of reading raw sensor data and driving outputs to a dedicated hardware module, the overall control system’s performance is enhanced. This module handles these tasks with deterministic timing, freeing the main processor to focus on complex control algorithms and sequencing. This separation is crucial for achieving fast, stable engine response.

9907-1200

Proven Integration within Woodward Ecosystem: This module is not a generic component; it is designed to work seamlessly with other Woodward control hardware (like a 2301A actuator driver or a ProTech CPU) and is configured using Woodward’s proprietary Toolkit™ software. This integration ensures compatibility, simplifies system design and troubleshooting, and provides access to Woodward’s application engineering support.

Application Areas

This interface module is a core component in control systems for:

Standby/Prime Power Generator Sets (Gensets): Within an EasyGen control panel, interfacing with the engine and generator for speed control, protection, and synchronization.
Industrial Engine Governing: In ProTech or legacy EGB (Electronic Governor Board) systems for controlling the speed of gas or diesel engines in mechanical drive applications (pumps, compressors).
Marine Propulsion: For governing the speed of main propulsion engines.
Gas Turbine Control: As part of the I/O subsystem for smaller turbine applications.

Installation and Maintenance

Installation Preparation:

System Assembly: The module is typically installed at the factory during control panel assembly. It must be seated correctly in its slot on the backplane or motherboard.
Field Wiring: Sensor and actuator cables are connected to the module’s terminal blocks or connectors. Critical: Wiring for magnetic pickups (MPUs) must be shielded twisted pair, with shields grounded at the module end only to prevent noise.
Configuration: I/O points (sensor types, scaling, alarm setpoints) are configured in the Woodward Toolkit™ software as part of the overall system setup.

Maintenance Advice:

Diagnostic Monitoring: Use the Toolkit™ software or the system’s HMI to monitor the status of inputs and outputs. Look for discrepancies between expected and actual readings.
Signal Verification: Periodically verify critical signals. For example, check the MPU AC voltage output with a multimeter while cranking the engine to ensure a healthy speed signal is reaching the module.
Connection Inspection: During routine maintenance, check all electrical connections on the module for tightness and signs of corrosion, especially in high-vibration environments.
Module Replacement: If diagnostics point to a faulty module, replacement involves:
- Powering down the control system.
- Carefully disconnecting any cables.
- Swapping the module.
- Powering up and verifying operation. Configuration is typically stored in the main controller, not on this I/O module.