Description

Product Overview

The WOODWARD 9905-726 is a Woodward electronic control unit associated with the 9905 series of industrial engine and turbine control equipment. These controllers are used in prime-mover governing applications where electronic speed regulation is required to maintain stable operation as load changes. Depending on the installed configuration, the control system can process magnetic-pickup speed feedback, operating commands, and actuator signals to regulate fuel or steam admission. The 9905 series is found in legacy generator sets, industrial engines, compressors, pumps, and turbine installations. For replacement work, the exact model suffix is important because Woodward control products can differ in power supply, input/output configuration, actuator compatibility, and factory calibration. The controller should therefore be matched to the existing application rather than selected solely by product-family name.

Technical Specifications — 9905-726

WOODWARD 9905-726

Key Features and Benefits — 9905-726

• Intended for electronic governing of industrial prime movers.
• Provides closed-loop speed regulation using feedback from the driven machine.
• Supports actuator-based control of fuel or steam, depending on the application.
• Suitable for generator sets and other rotating equipment.
• Designed for integration with existing Woodward governor and actuator systems.
• Useful as a legacy spare where maintaining the original control architecture is necessary.

Personally, I would verify the nameplate, actuator compatibility, and application configuration before ordering. The 9905 family contains several application-specific variants, and a physically similar controller may not have the correct electrical characteristics.

Related Models

WOODWARD 9905-705 — Related Woodward electronic governor/control model used in legacy prime-mover control applications.

WOODWARD 9905-910 — Another 9905-series control configuration used for industrial governing applications.

WOODWARD 2301 Series — Electronic governor family commonly applied to diesel and gas engines, generator sets, and other prime movers.

WOODWARD 505 Series — Digital turbine-control family intended primarily for steam-turbine speed, load, and valve management.

Installation and Maintenance — 9905-726

Before installation, record the existing controller’s wiring, configuration parameters, speed-sensor connections, actuator type, power supply, and shutdown circuits. Isolate the equipment according to the plant’s approved electrical and mechanical safety procedure.

During maintenance, inspect the controller terminals, speed-pickup wiring, actuator connections, grounding, and enclosure ventilation. After replacement, verify speed feedback and actuator response at controlled operating conditions. Perform no-load and load testing as appropriate, and confirm independent shutdown and overspeed protection before returning the prime mover to service.

Product Warranty — 9905-726

Warranty coverage depends on supplier condition and sales terms. Confirm whether the WOODWARD 9905-726 is new old stock, refurbished, repaired, or previously installed. Request serial-number traceability, functional-test documentation, configuration information, and the applicable warranty period.

The WOODWARD 9905-726 should be treated as a configuration-specific legacy governor spare. Exact electrical and application compatibility should be confirmed against the installed controller before procurement.