Data Sheet & Parameters

Input Voltage: 120Vac/dc

Dimensions: 19 inches (W) × 12.244 inches (H) × 5.62 inches (D)

Operating Temperature: -13 to +140°F (approximately -25 to 60°C)

Weight: Less than 17 pounds

Adjustable Parameters: Trip speed setpoint (250rpm to 25,000rpm), MPU gear teeth count (20 to 120), MPU fault timeout (1 second to 533 minutes and 20 seconds), MPU fault setpoint (100rpm to 25,000rpm), etc.

Operating Principle

The WOODWARD 9907-149 detects the prime mover speed via three magnetic pickups (MPUs). These three speed-sensing units (Unit A, Unit B, and Unit C) operate independently, each equipped with a separate power supply, operator interface, and alarm system.

The three units run independently: they monitor the prime mover speed through their respective MPUs, perform speed calculations separately, and then adopt a 2-out-of-3 voting logic to determine whether to trigger a trip.

When the detected speed exceeds the preset trip speed setpoint, the device will activate a trip to protect the equipment from damage.

Application Scenarios

Power Industry: Used in power plants to protect rotating equipment such as steam turbines and gas turbines, ensuring the safe operation of power generation equipment.

Petrochemical Industry: Applied in petroleum refining and chemical production processes to protect various industrial drive equipment (e.g., pumps, fans), preventing safety accidents caused by equipment overspeed.

Marine Industry: Suitable for marine power systems to protect ship propulsion systems and ensure the safety of ship navigation.

Other Industrial Sectors: Utilized in various industrial fields that require protection for rotating mechanical equipment (e.g., iron and steel, cement industries) to prevent equipment overspeed.

Translation Notes

Term Consistency: Industry-specific terms are standardized for accuracy, e.g., → "Electronic Overspeed Protection Device", （MPU）" → "magnetic pickups (MPUs)" (MPU = Magnetic Pickup, a common abbreviation in industrial speed-sensing contexts).

Logic Clarity: The "三中二投票方法" is translated as "2-out-of-3 voting logic"—the standard English expression for this redundancy control mechanism, ensuring technical readers (e.g., engineers, procurement teams) understand the safety design.

Unit Precision: Dimensions and temperature are presented with both imperial (inches, °F) and metric (°C) units (retained from the original Chinese data), aligning with global industrial documentation practices.

Scenario Specificity: Industry names (e.g., "石油化工行业" → "Petrochemical Industry", "钢铁、水泥等行业" → "iron and steel, cement industries") use internationally recognized terminology to avoid ambiguity in cross-border communications.

Main products:

Covering globally renowned brands:

Bently Nevada, Triconex, Woodward, Foxboro, Westinghouse, Reliance, Schneider Modicon, ABB, Allen-Bradley, Motorola, GE Fanuc, Yaskawa, Bosch Rexroth, ACSO, Yokogawa, Rexroth, NI, ICS Triplex, Kollmorgen, Mitsubishi, MOOG, Emerson, B&R, Alstom, EPRO, HIMA, Honeywell, Prosoft, AMAT, Siemens, etc.

Product categories include: DCS system accessories, robot system spare parts, large servo system spare parts, etc., widely used in power, chemical, metallurgy, intelligent manufacturing and other fields.

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