Woodward 9907-252 – Load Sharing & Speed Control for Engine and Generator Governing

The Woodward 9907-252 is a 2301A-type Load Sharing and Speed Control that’s widely used to govern prime movers and keep paralleled generators stable and on-speed. From my experience, it’s the kind of analog control you choose when you want proven load sharing behavior, a dependable 0–200 mA actuator drive, and straightforward cabinet integration without PC software.

Typical applications include gensets working in parallel (isochronous or droop), engine-driven pumps and compressors, and retrofit projects where compatibility with existing Woodward actuators and MPUs really matters.

• Speed governing (isochronous/droop) – Stable control for single or paralleled units; droop helps with load sharing, isochronous keeps frequency tight.

• Woodward load share line – Works with compatible Woodward controls to balance kW across multiple gensets; typically no complex networking required.

• 0–200 mA actuator output – Drives common Woodward electric actuators and EHSV drivers reliably in most installations.

• MPU speed input – Rugged magnetic pickup feedback for precise speed sensing on engines and turbines.

• Raise/Lower and remote bias – Discrete contacts for operator speed trim; analog bias input typically available for external setpoint control.

• Panel-friendly, analog adjustments – Front-panel potentiometers for gain/stability/limits; no laptop or licensing needed.

• 24 Vdc nominal supply – Common control voltage in switchboards and engine control panels.

• Retrofit-ready – Often a drop-in upgrade in older cabinets that already use Woodward actuators and MPUs.

• Power generation – Paralleled diesel or gas gensets on microgrids, hospitals, data centers, and marine switchboards.

• Oil & gas – Engine-driven compressors and pump packages where stable speed and coordinated load sharing are required.

• Industrial drives – Turbines and engines on mills, process plants, and CHP systems needing responsive governing.

• Retrofit projects – Replacing legacy analog controls while keeping existing actuators, MPUs, and cabinet layouts.

• Reliability first – The 2301A line is known for long service life; fewer software variables means predictable behavior.

• Compatibility – Typically works with common Woodward actuators (e.g., 0–200 mA) and standard MPUs without redesign.

• Fast commissioning – Potentiometer-based tuning reduces startup time; no PC tools, drivers, or licensing.

• Lifecycle economy – Analog control limits training effort and reduces the risk of configuration drift; spare parts are widely available.

• Global support – Woodward has strong service coverage; getting help or parts in most regions is straightforward.

• Panel/cabinet environment – Mount in a clean, dry, vibration-controlled cabinet. Provide ventilation to keep electronics within rated temperature.

• Power and grounding – Use a stable 24 Vdc supply with proper grounding. Segregate low-level MPU wiring from high-current actuator cables.

• Shielding and routing – Shielded twisted pair for the MPU input is typically required; terminate shields at a single point to reduce noise.

• Actuator wiring – Confirm 0–200 mA compatibility and polarity; check actuator linkage for free travel before live tests.

• Tuning – Start with conservative gain/stability settings; step-load test and record final pot positions for future reference.

• Routine care – Periodically inspect terminals, clean dust, verify speed settings and droop/isochronous performance. No firmware updates are needed on this analog model.

• Safety – Observe ESD precautions; lockout/tagout prime mover; confirm governor fail-safe behavior during commissioning.

• Manufactured under ISO 9001 quality systems.

• CE marking for applicable directives; UL/cUL recognition is commonly available for Woodward governor controls.

• RoHS compliance may vary by production date; verify if your project mandates it.

• Manufacturer’s standard warranty, typically 24 months when supplied new through authorized channels.

• Woodward EG-series actuators (0–200 mA) – Common match for the 9907-252 output, used on diesel/gas engines.

• Woodward magnetic pickups (MPU) – Choose thread and length to suit your flywheel housing; shielded wiring strongly advised.

• Load sharing with compatible Woodward controls – For multi-set operation, pair with other Woodward load-share-capable governors or synchronizers when required by your scheme.

• Auxiliary items – Quality 24 Vdc power supply with surge protection, terminal markers, cable shields, and an external raise/lower switch for operators.