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Woodward 9907-1104

Product Overview:​ Woodward 9907-1104 belongs to the 9907 series of 2301A Electronic Load Sharing and Speed Control devices. The 2301A is an electronic control that simultaneously achieves two major functions: speed control and load sharing. Speed control maintains stable speed of the prime mover (engine/turbine), while load sharing ensures proportional load distribution when multiple units operate in parallel, avoiding single-unit overload or uneven load distribution.

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Core Functions and Configuration:​ The 2301A control is available in forward- or reverse-acting configurations, with either single or tandem actuators. The high-voltage model is nominally rated 125 Vdc, 100 Vac 50 Hz, or 120 Vac 60 Hz. The low-voltage model is nominally rated 24 Vdc. The voltage of the model is identified on the front of the control.
Key Technical Parameters:
  • Speed Ranges (switch-selectable via S1): 500-1500 Hz, 1000-3000 Hz, 2000-6000 Hz, 4000-12000 Hz
  • Actuator Output: 0-200 mA proportional actuator output
  • Speed Sensor: Magnetic pickup (minimum 1.0 Vrms at starting speed, maximum 25 Vrms at rated speed); sensor-to-gear air gap 0.25-1.0 mm
  • Power Supply: Low-voltage type 18-40 VDC; High-voltage type 90-150 VDC or 88-132 VAC
  • Operating Temperature: -40 to 85°C (-40 to 185°F)
  • Relative Humidity: 10% to 95% (non-condensing)
  • Control Modes: Isochronous (constant speed) and Droop (speed decreases with increasing load, adjustable via potentiometer, typically 3% droop)
  • Optional Deceleration Ramp: When present, ramp time from rated speed to idle speed is approximately 20 seconds
Note:​ The exact configuration of 9907-1104 (actuator current range, forward/reverse acting, voltage level, deceleration ramp presence) is not explicitly listed in the publicly accessible 2301A part number tables found in this search. The 2301A part number tables document models such as 9907-020, 9907-021, 9907-238, 9907-239, 9907-250, 9907-251, 9907-236, 9907-237, and 9903-327. The specific attributes of 9907-1104 should be verified via the official Woodward 2301A manual (Manual 82389 or 26006).
Application Scenarios:​ Controls load sharing and speed for generator sets driven by diesel engines, gasoline engines, steam turbines, or gas turbines. Suitable for single-unit operation, isolated bus parallel operation, and infinite bus parallel operation.
Installation Requirements:
  • Prohibited from direct installation on the engine
  • Reserved heat dissipation space required (ventilation gap ≥ 3 cm, distance ≥ 15 cm from heating components)
  • Vertical installation inclination ≤ ±45° (when no forced ventilation)
  • All signal cables (speed measurement, actuator, load share lines) must use shielded twisted pair cable; shield grounded only at controller end (terminals 22, 27, 12) with other end floating
  • Terminal creepage distance ≥ 6.5 mm (EU Low Voltage Directive compliance)
Usage Precautions:
  • In reverse-acting systems, complete loss of voltage to the actuator will drive the actuator to full fuel, allowing a backup mechanical ballhead governor to take control
  • CT open circuit will generate high voltage; power off before wiring
  • The prime mover should be equipped with an independent overspeed shutdown device
  • Read the entire manual and all other publications pertaining to the work before installing, operating, or servicing

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