Description
The Woodward 828 Digital Control (Part Number: 9907-247) is a microprocessor-based control system engineered for the precision management of reciprocating engines (diesel, gas, or dual-fuel). This unit provides comprehensive control over speed, load, and auxiliary engine functions. As a versatile legacy controller, the 828 is widely used in power generation, marine propulsion, and heavy-duty industrial compression applications where reliable governing is mission-critical.
Technical Parameters
- Model: 828 Digital Control
- Part Number: 9907-247
- Control Platform: Microprocessor-based digital governing
- Input Voltage: 18–32 VDC
- Operating Logic: Configurable PID parameters, speed ramping, and load-sharing dynamics
- Dimensions: 280 mm x 200 mm x 120 mm
- Weight: 2.5 kg
- Origin: USA
Application Areas
- Prime power generation for industrial facilities
- Marine vessel engine speed and load management
- Large gas compression reciprocating engines
- Cogeneration (CHP) plants
Product Usage Instructions
- Mounting: Secure the control unit within a vibration-dampened electrical cabinet, ensuring adequate clearance for cable routing and heat dissipation.
- Wiring: Use high-quality shielded cabling for all sensor inputs (MPU, temperature, pressure) and output actuators to mitigate electromagnetic interference.
- Configuration: Use the Woodward service tool or front-panel interface to program the engine-specific speed curves, gain settings, and safety shutdown parameters.
- Calibration: Perform a speed-calibration routine after installation to ensure the MPU (Magnetic Pickup) input accurately reflects the actual engine crankshaft RPM.
Product Description
The 9907-247 provides robust, deterministic control of the engine’s fuel rack or throttle actuator. It processes real-time data from engine sensors to maintain precise speed, regardless of fluctuations in load. The unit is built to withstand high-vibration engine-room environments and includes self-diagnostic features that monitor internal hardware health, ensuring that any control failure triggers an immediate and safe engine shutdown.
Protection & Environmental Parameters
- IP Rating: Designed for integration within NEMA/IP-rated control panels.
- Corrosion Resistance: Features heavy-duty conformal coating on all internal circuit boards to guard against humidity and corrosive atmospheric agents.
- Operating Temperature: -20°C to +70°C.
- Storage Temperature: -40°C to +85°C.
- Humidity: 5% to 95% relative humidity, non-condensing.
Mechanical & EMC Standards
- Vibration Resistance: Designed to meet rigorous industrial standards for constant-load reciprocating engine vibration.
- EMC Compliance: Optimized for high noise immunity, ensuring signal stability even when mounted in close proximity to high-current ignition systems or large contactors.
- Surge Protection: Includes internal suppression to protect against electrical spikes on the 24V supply line.
Frequently Asked Questions
- How do I troubleshoot “Speed Signal Loss”? Check the magnetic pickup (MPU) for proper gap distance to the flywheel gear teeth and inspect the cabling for oxidation or grounding issues.
- Is this control unit field-repairable? The 828 is a complex digital assembly; component-level repair is not feasible. If a hardware failure occurs, replacement with a factory-tested unit is the standard procedure.
- Can the 9907-247 be used to parallel generators? Yes, it supports load-sharing and synchronization when configured with the appropriate communication modules and peripheral sensors.
- What is the difference between this and newer Woodward controllers? While newer controllers (like the 2301E or 723 series) offer expanded networking and touch-screen interfaces, the 828 remains a preferred choice for applications requiring proven, robust, and straightforward governing logic.
