| Feature | Specification |
| Model | WOODWARD 723 |
| Part Number | 8280-501 |
| Control Type | Digital Speed & Load Control |
| Input Power | 18–40 VDC (24 VDC Nominal) |
| Speed Sensing | Magnetic Pickup (MPU) / Proximity Switch |
| Actuator Output | 0–200 mA (Standard) |
| Communication | RS-422 Serial Port |
| Discrete Inputs | 8 Configurable Inputs |
| Analog Outputs | 2 Configurable (0–5V or 4–20mA) |
| Operating Temp | -40°C to +70°C |
The WOODWARD 723 (8280-501) serves as a high-performance digital speed control unit designed for precise regulation of reciprocating engines and gas turbines. It excels in managing complex governing functions, including isochronous load sharing, droop control, and fuel-limiting sequences, providing stable and responsive engine management for both prime power generation and mechanical drive applications in demanding industrial environments.
Woodward 8280-501 Rev.F 723 digital control 9906-130
Model Comparisons
The 8280-501 is a specialized variant within the 723 Plus/Digital family, often distinguished by its specific actuator output current and software logic. While the 8280-412 is frequently used for low-voltage/low-current actuators, the 501 model is engineered to drive high-mass fuel racks requiring a consistent 0–200 mA signal. Compared to the newer Woodward 723Plus or 2301E series, the 8280-501 maintains a more traditional hardware footprint, making it a critical “legacy-ready” replacement for older analog 2301A systems that require a digital upgrade without replacing the existing magnetic pickups or cabling.
Operating Tips
- Handheld Programmer: Use the Woodward 9907-018 handheld terminal for field adjustments; ensure the “Watch Window” parameters are saved to non-volatile memory after tuning to prevent losing PID settings during a power cycle.
- Shielding Ground: Terminate the MPU (Magnetic Pickup) cable shield only at the control end; floating the engine-side shield is essential to prevent ground loops that cause “speed jitter” and unstable governing.
- Actuator Calibration: Before the first start, perform a manual “Current Stroke” test via the service menu to verify that 200 mA corresponds exactly to the maximum fuel rack position, ensuring the safety of the overspeed protection logic.
