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Woodward 9904-664

Product Name:​ Woodward 2301A Series Load Sharing and Speed Control (9904 Series variant)
Product Introduction:​ The 9904-664 is a member of Woodward’s broader 2301A family of load sharing and speed controls. While specific verified technical details for 9904-664 as a discrete part number are limited in publicly available documentation, the 2301A platform as a whole is designed to govern the speed and load sharing functions of prime movers—such as diesel engines, gas engines, and turbines.
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Detailed content

Technical Specifications (Platform-Level for 2301A):
  • Power Supply:
    • Low-voltage model: 20–40 Vdc (normal 24 Vdc), with transient tolerance down to 9.6 Vdc for up to 5 minutes
    • High-voltage model: 90–150 Vdc or 88–132 Vac, 45–440 Hz
  • Actuator Output: 0–200 mA (compatible with single or tandem actuators depending on model)
  • Speed Ranges (switch-selectable): 500–1500 Hz, 1000–3000 Hz, 2000–6000 Hz, or 4000–12000 Hz
  • Load Sensing: 3-phase potentials (90–240 Vac, 45–66 Hz); 3-phase currents (3–7 A at full load)
  • Steady State Speed Band: ±1/4 of 1% of rated speed
  • Load Sharing Accuracy: Within ±5% of rated load with speed settings matched
  • Operating Temperature: –40 °C to +70 °C
  • Humidity: 95% RH non-condensing
  • Construction: Sheet-metal chassis, single PCB, front-accessible potentiometers
  • Weight: Approx. 1.9 kg (4.2 lbs) for standard 2301A units
Functional Features:
  • Isochronous or droop speed control
  • Isochronous load sharing
  • Linear idle to rated speed ramp (0–10 seconds)
  • Automatic fuel limiting during starts
  • Failed speed sensor protection
  • Internal isolated power supply for noise immunity and ground-loop protection
  • Some models include temperature limiting (Type K thermocouple input) or process limiting (4–20 mA or 1–5 Vdc input)
Application Scenarios:​ Electric generator systems requiring load sharing. Compatible with diesel or gas engines, steam or gas turbines. Typical in industrial power generation, marine propulsion, and CHP systems.
Working Principle:​ The 2301A uses a proportional-integral control loop. It measures actual speed via a Magnetic Pickup (MPU), compares it to the reference, and outputs a 0–200 mA signal to drive the proportional actuator positioning the fuel-metering device. For load sharing, load share lines interconnect multiple 2301A units to balance real power output.
Installation Requirements:
  • Install in an enclosed industrial control cabinet or closed electrical operating area
  • Ensure adequate ventilation and maintenance access
  • Operating environment: –40 °C to +70 °C, non-condensing humidity ≤95% RH
  • Use shielded twisted-pair cabling for all speed, load-sharing, and actuator signal lines
  • Ensure correct MPU polarity and CT/PT phasing
  • Do not mount the controller on the engine
Usage Precautions:
  • The prime mover must have an independent overspeed shutdown device
  • Observe ESD handling procedures per Woodward manual 82715
  • For exact configuration of 9904-664 (voltage class, actuator current, acting direction), consult Woodward’s legacy product database or contact Woodward support with the serial number
  • Do not modify the control beyond published specifications

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