Description
🚀 Engineered for precise industrial engine and turbine management, the Woodward 9905-145 is a specialized load sharing and speed control module within the trusted 2301A series. It delivers reliable prime mover speed regulation and active electrical load distribution, featuring a maximum load gain of 6 VDC at 5 A CT current and precise magnetic pickup (MPU) air gap clearance parameters.
Technical Specifications & Datasheet
⚙️ Dimensions: 221 mm x 155 mm x 64 mm (Standard 2301A enclosure format)
⚖️ Weight: Approx. 1.8 kg (4 lbs)
🌍 Country of Origin: United States
⚡ Power Consumption: 15 W nominal
🔌 Operating Voltage: Standard 2301A low-voltage or high-voltage power configuration variants
🌡️ Operating Temperature: -40°C to +85°C (-40°F to +185°F)
🛡️ Enclosure Rating: IP20 chassis-mount with metallic product backplane
🔄 Speed Range: Switch-selectable ranges up to 11,450 Hz derived via MPU frequency input
⚡ Load Gain Performance: 6 VDC maximum at 5 A CT (Current Transformer) current input
⚙️ MPU Clearance Gap: 0.010 to 0.040 inches recommended sensing probe air gap
Operating Procedures & Usage Methods
🛠️ Securely mount the module onto its metallic backplane inside a protective industrial control panel or cabinet, ensuring proper vertical clearance for terminal connections and natural convection cooling.
🔧 Install the magnetic pickup (MPU) sensor maintaining a strict air gap clearance of 0.010 to 0.040 inches from the gear teeth, and connect the speed sensor, current transformers, actuator lines, and power supply according to the terminal wiring diagram.
📋 Adjust front-panel potentiometers (such as gain, reset, speed trim, and load gain) carefully during initial calibration to match engine dynamics, CT ratios, and synchronization parameters.
Power Sequencing Guidelines
🔌 Startup Sequence: Energize the input power source to initialize internal control circuits, verify that MPU speed signals stabilize within range, and confirm zero fault codes before enabling fuel or steam delivery to the prime mover.
🛑 Shutdown Sequence: Disable the actuator control loop or cut fuel/steam supply to bring the prime mover to a complete, safe stop prior to isolating the main system power feed.
Product Usage Instructions
📖 Ensure the load gain is properly calibrated so that full generator load yields up to 6 VDC maximum output relative to the 5 A CT current input.
📖 Select isochronous mode when coordinating constant frequency across multiple paralleled engines, or switch to droop mode for single-engine speed governing and isolated electrical generation.
Frequently Asked Questions
💡 Q: What are the key load and sensor specifications for the 9905-145 model?
A: It is designed with a load gain of 6 VDC maximum at 5 A CT current, and requires an MPU probe clearance of 0.010 to 0.040 inches for proper pulse detection.
💡 Q: What is the primary function of this unit?
A: It functions as an electronic load sharing and speed control device to maintain stable prime mover speed and distribute active electrical load proportionally among parallel generators.
💡 Q: What governor series does this unit belong to?
A: It is part of Woodward’s widely utilized 2301A analog load sharing and speed control product line.
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