WOODWARD 9907-031 723 Series Digital Engine Governor with Analog/Discrete I/O

Brand WOODWARD

Model WOODWARD 9907-031 723

Product Overview

The WOODWARD 9907-031 is a low-voltage digital speed control belonging to the renowned Woodward 723 Series, specifically engineered for governing reciprocating engines in generator set service. As a microprocessor-based governor, the Woodward 9907-031 replaces traditional mechanical and analog control systems with precise digital signal processing, delivering stable engine speed regulation under varying load conditions. This control is particularly suited for gas, diesel, and dual-fuel engines used in power generation, marine propulsion, and gas compression applications where frequency stability is critical.

The 9907-031 Woodward operates on an 18 to 40 VDC power input, making it the low-voltage variant within the 723 family. The control accepts inputs from two independent speed sensors—either magnetic pickups (MPUs) or proximity switches—providing redundant speed feedback for enhanced reliability. Its compatibility with the DSLC™ (Digital Synchronizer and Load Control) platform enables seamless integration into isochronous load sharing systems, allowing multiple generator sets to operate in parallel while maintaining proportional load distribution. The WOODWARD 9907-031 features eight discrete inputs, four analog inputs, and four analog outputs, with two outputs configurable for 0–1/4–20 mA signals and two additional outputs rated for 0–20/0–200 mA actuator drive currents.

Programming and parameter adjustment of the Woodward 9907-031 are accomplished through the Woodward Hand Held Programmer or any standard ASCII terminal connected via the RS-422 serial port. All set points are stored in non-volatile memory, eliminating the need for battery backup and ensuring configuration retention through power cycles. The control’s self-diagnostic capabilities continuously monitor memory, processor, and power supply integrity, providing early warning of potential faults before they impact engine operation.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	WOODWARD 9907-031
Manufacturer	Woodward
Product Type	Digital Speed Control / Governor
Series	723 Series (Low Voltage)
Input Voltage Range	18 to 40 VDC (24 or 32 VDC nominal)
Power Consumption	40 W nominal
Speed Sensor Inputs	2 channels (MPU or proximity switch)
Speed Input Voltage	1.0 to 50 Vrms
Speed Input Frequency	250 Hz to 15 kHz (analog); 30 Hz to 15 kHz (digital)
Discrete Inputs	8 (24 VDC, 10 mA nominal)
Analog Inputs	4 (±5 VDC or 0–20 mA, externally powered)
Analog Outputs	2 × 0–1/4–20 mA; 2 × 0–20/0–200 mA
Load Sharing Input	0–4.5 VDC
Relay Contact Outputs	3 (2.0 A resistive @ 28 VDC)
Communication	RS-232, RS-422, RS-485; Modbus ASCII/RTU
Operating Temperature	-40°C to +70°C
Storage Temperature	-55°C to +105°C
Chassis Dimensions	41.28 × 29.21 × 6.04 cm
Weight	Approx. 2.95 kg (6 lbs 8 oz)
Certifications	UL, cUL listed

Main Features and Advantages

Precision Digital Speed Governing: The WOODWARD 9907-031 employs advanced digital processing to eliminate frequency drift and maintain stable engine speed even during sudden load applications. Its internal algorithms adapt to the specific inertia characteristics of the prime mover, delivering smooth fuel-rack response that minimizes mechanical wear and prevents overspeed oscillations.

Dual Speed Sensor Redundancy: Two independent speed signal inputs accept either magnetic pickups or proximity switches, providing redundant feedback paths for critical generator applications. This dual-channel architecture allows the 9907-031 Woodward to maintain control integrity even if one sensor fails, enhancing overall system reliability in unattended power generation facilities.

DSLC Load Sharing Compatibility: The Woodward 9907-031 is designed for seamless integration with Woodward’s DSLC Digital Synchronizer and Load Control platform. When connected via the load sharing input terminals, multiple generator sets equipped with the 9907-031 Woodward can operate in isochronous parallel configuration, automatically distributing real power proportionally across all units.

Configurable Analog Outputs: Four analog output channels provide flexible interface options for actuators, meters, and external control systems. Two outputs are jumper-configurable for 0–1 mA or 4–20 mA ranges, while the remaining two channels support 0–20 mA or 0–200 mA actuator drive requirements. This output flexibility allows the WOODWARD 9907-031 to drive a wide range of fuel actuators and interface with existing plant instrumentation.

Comprehensive Self-Diagnostics: Integrated diagnostic routines continuously monitor processor operation, memory integrity, and baseline power supply health. The Woodward 9907-031 illuminates POWER OK and CPU OK indicators upon successful startup, giving operators immediate visual confirmation of control readiness before engine cranking begins.