Digital guide
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Woodward 9907-651
Product family: Woodward 2301A electronic load sharing and speed control (9905/9907 series). The 2301A is an analog electronic control that sets the speed or load of a diesel engine, gas engine, steam turbine, or gas turbine according to a 4–20 mA or 1–5 Vdc process/computer demand signal.
Product brief: Housed in a sheet-metal chassis with a single printed circuit board; all potentiometers are front-accessible. Speed range is selected via an internal DIP switch (500–1500 Hz, 1000–3000 Hz, 2000–6000 Hz, or 4000–12 000 Hz).
Detailed content
Key specifications (2301A platform):
- Power supply: Low-voltage models 18–40 Vdc (nominal 24 Vdc); high-voltage models 88–132 Vac or 90–150 Vdc
- Actuator output: 0–200 mA (forward- or reverse-acting depending on model)
- Speed sensor: Magnetic pickup, 1.0 Vrms minimum above idle, up to 25 Vrms at rated speed
- Operating temperature: –40 to +70 °C (per 9907-series general spec); some 2301A documentation extends to –40 to +85 °C
- Load sharing: ±5 Vdc load sharing bus; compatible with Woodward SPM-A synchronizer and load sensors
- Control modes: Isochronous (constant speed) or droop (externally wired potentiometer)
- Acceleration ramp: 1–22 seconds low-idle to rated; decel <1 second
- Weight: approximately 1.8 kg
Functional highlights: Start fuel limit with override, failed-speed-signal minimum-fuel circuit, low-idle/rated speed selection, gain/reset/actuator compensation adjustments, and optional deceleration ramp (~20 s rated-to-idle when fitted).
Applications: Genset speed governing and parallel load sharing for diesel, gas, steam, and gas-turbine prime movers.
Installation & safety notes: Do not install directly on the engine; maintain ventilation clearance and keep away from strong EMI sources. Always confirm the DIP-switch speed range matches the gear-tooth count × rpm ÷ 60 formula before energizing—using the wrong range can cause overspeed with equipment damage or fatal injury. Prime movers must have an independent overspeed trip device; the 2301A alone is not a protection device. Use shielded cable for MPU and load-sharing wiring, connecting shields only to the designated terminals.
