Woodward 9905-864 – Analog Load Sharing & Speed Control for Engine/Genset Governors

The Woodward 9905-864 is part of Woodward’s proven analog governor controls, typically used to regulate prime mover speed and manage load sharing in generator applications. From my experience, this model is favored when you want rugged, predictable behavior without the complexity of a fully digital configuration. It’s well-suited for retrofits or mixed fleets where reliability and consistent actuator current drive are more important than advanced networking.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: 1 week if in stock; no more than one month at the latest
• Payment: 50% advance payment; full payment prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Analog speed control: Stable isochronous or droop regulation for engines and gensets, ideal where deterministic behavior is critical.
• Load sharing capability: Works with Woodward load sharing schemes for multi-set parallel operation; typically integrates cleanly with DSLC/MSLC systems.
• Magnetic pickup speed input: Reliable MPU sensing for precise speed feedback without added fieldbus complexity.
• Actuator current output: Drives Woodward proportional actuators/governors (e.g., EGB/EG series) for tight fuel rack control.
• Operator-friendly adjustments: Front-panel trim (gain, stability, droop) helps technicians tune on-site quickly.
• Rugged industrial build: Designed for cabinet installation in harsh environments; it seems to hold up well in vibration and temperature swings.
• No dependencies on comms: Pure analog I/O reduces integration risks on legacy plants or mixed-brand sites.

Technical Specifications

Application Fields

You’ll typically see the 9905-864 on industrial engines and generator sets where dependable analog control is preferred. Common deployments include:

• Power generation: prime power and standby gensets, with or without paralleling
• Oil & gas: pump drives and compressor sets that demand stable speed regulation
• Marine & offshore: auxiliary generators and mechanical drives in tough conditions
• Industrial process: engines driving blowers, fans, or mills where simple tuning is valued

Advantages & Value

• Reliability first: Analog hardware with a long service track record—downtime risk tends to be low when set up correctly.
• Compatibility: Works with Woodward actuators/governors (EG/EGB series) and typical MPUs; easy fit for many existing cabinets.
• Lower integration overhead: No fieldbus to engineer or maintain; wiring is straightforward for most plant electricians.
• Serviceability: Adjustments are accessible; techs can retune after engine overhauls or fuel changes without specialized software.
• Lifecycle cost: In many cases, retrofit cost is substantially lower than converting to a full digital platform, especially on smaller units.

Installation & Maintenance

• Cabinet & environment: Install in a clean, ventilated panel; keep away from heat sources and high-vibration mounts when possible. Follow standard switchgear practices.
• Wiring: Use shielded twisted pair for the MPU; route separately from power conductors. Keep actuator wiring within recommended lengths and check grounding.
• Tuning: Set gain/stability with the engine at operating temperature and typical load. You might notice small tweaks improve transient response.
• Safety: Lockout/tagout before wiring changes; verify actuator stroke and fuel limits. Use a tachometer to confirm setpoints.
• Routine maintenance: Inspect connectors quarterly, clean dust, verify MPU airgap, and re-check speed droop/isochronous settings after engine service.

Quality & Certifications

• Typically supplied to CE-compliant installations; RoHS applicability depends on vintage
• Manufactured under Woodward’s quality system (ISO-based processes)
• Standard manufacturer warranty support; our sales warranty: 365 days

Supporting Components (Common Pairings)

To complete a typical installation, many sites pair the 9905-864 with:

• Woodward EG/EGB actuators or hydraulic governors: Proportional actuator for precise fuel control.
• Magnetic Pickup (MPU) sensor: Engine speed sensing using the flywheel ring gear.
• Woodward DSLC/MSLC modules: For genset paralleling, kW/kVAR sharing, and breaker control on multi-set systems.
• Overspeed protection (e.g., ProTech series): Independent trip device for safety compliance.