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Woodward 9905-667

Product Name:​ Woodward 2301A Series Load Sharing and Speed Control (9905/9907 Series)
Product Introduction:​ The 9905-667 is a member of the Woodward 2301A 9905/9907 series of electronic load sharing and speed controls. These controls govern the speed and load sharing of generators driven by diesel or gasoline engines, or steam or gas turbines. The control is housed in a sheet-metal chassis and consists of a single printed circuit board, with all potentiometers accessible from the front.
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Technical Specifications (Series-Level):
  • Speed Ranges (switch-selectable): 500–1500 Hz, 1000–3000 Hz, 2000–6000 Hz, or 4000–12000 Hz
  • Actuator Output: 0–200 mA
  • Power Supply: Low-voltage model (20–40 Vdc) or High-voltage model (90–150 Vdc or 88–132 Vac, 45–440 Hz)
  • Operating Temperature: –40 °C to +70 °C
  • Humidity: 95% RH non-condensing
  • Enclosure: Sheet-metal chassis, single PCB, front-accessible potentiometers
  • Mounting: Panel-mountable in industrial control cabinet
Functional Features:
  • Isochronous or droop speed control
  • Isochronous load sharing
  • Idle and rated speed settings
  • Linear idle-to-rated speed ramp (0–10 seconds)
  • Start fuel limiting with failed speed signal override
  • Four switch-selectable speed ranges
  • Available in forward-/reverse-acting and single/tandem actuator variants
Application Scenarios:​ Prime mover speed and load control in generator sets across industrial power generation, marine, oil & gas, and standby power applications.
Working Principle:​ The 2301A uses an MPU to sense speed, compares it to the reference, and outputs a proportional current to the actuator. In paralleled applications, load share lines enable real-time load balancing among multiple units.
Installation Requirements:
  • Mount in an enclosed control cabinet; do not mount on the engine
  • Operating environment: –40 °C to +70 °C, non-condensing humidity ≤95% RH
  • Use shielded wiring with proper grounding
  • Verify MPU polarity and CT/PT phasing during installation checkout
Usage Precautions:
  • Independent overspeed protection is mandatory
  • Follow ESD guidelines when handling the module
  • Exact configuration parameters (voltage class, actuator current range, acting direction) should be verified via Woodward’s legacy product database or by referencing the unit’s nameplate against the 2301A product specification 82390

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