WOODWARD 9907-1291

الوصف

The Woodward 9907-1291 is a specific part number for a ProAct™ Plus Digital Fuel Limiter with a high-output sensor circuit. While part of the broader ProAct Digital Control family, its primary function is to limit fuel in an engine system, often working in conjunction with a separate speed controller.

WOODWARD 9907-1291: ProAct™ Plus 4-20mA Fuel Limiter (with High Output Sensor Circuit)

The Woodward 9907-1291 is a dedicated electronic control module within the ProAct™ Plus Digital Control System. Its main purpose is to precisely limit the fuel supplied to a prime mover (like a diesel or gas engine) based on a 4-20 mA command signal, while also featuring an enhanced sensor input.

Product Overview

• Product Type: Digital Fuel Limiter / Process Controller
• Manufacturer: Woodward
• Series: ProAct™ Plus (often associated with ProAct Model II or later generations)
• Function: Limits the maximum amount of fuel or air that an engine’s actuator can command, based on an external 4-20 mA signal. This is critical for preventing over-fueling, controlling emissions, or managing torque.
• Key Feature: Includes a High Output Sensor Circuit, indicating it’s designed to interface effectively with sensors that provide a stronger voltage output, ensuring robust signal integrity. It also specifically accepts a 4-20 mA input signal for its limiting function.
• Integration: It typically works in parallel with a speed controller. The speed controller dictates the engine’s desired speed, and the fuel limiter acts as an overriding limit on the actuator’s movement if the 4-20 mA input dictates a lower fuel setting.

Detailed Description

The ProAct™ Plus Digital Control systems are known for their advanced microprocessor-based control, offering high precision and robust performance in demanding industrial applications. The 9907-1291 is a specialized module that provides critical fuel management capabilities.

Key characteristics of the 9907-1291 include:

• Dedicated Fuel Limiting: Its core function is to act as a fuel limiter. It takes a 4-20 mA input signal, which typically represents a desired fuel limit (e.g., from a torque limiter, emission controller, or turbocharger speed limit), and ensures the actuator does not allow the engine to exceed that fuel level.
• 4-20 mA Input: The specified 4-20 mA input signal is a standard industrial control signal, making it compatible with a wide range of process sensors and control systems (e.g., exhaust gas temperature sensors, air/fuel ratio controllers, or load transducers).
• High Output Sensor Circuit: This feature ensures that the unit can reliably receive and process signals from various sensors, even in potentially noisy electrical environments.
• Microprocessor-Based Control: It uses sophisticated digital algorithms to interpret the 4-20 mA input and translate it into an appropriate limit command for the ProAct actuator.
• Programmability: Like other ProAct controllers, this fuel limiter is configurable via Woodward’s PC-based service tools. This allows for tuning of its response characteristics, scaling of the 4-20 mA input, and setting various operational parameters.
• Robust Design: Built to withstand the harsh conditions commonly found in engine rooms and industrial settings, including vibrations, temperature extremes, and electromagnetic interference, ensuring long-term operational reliability.
• System Integration: It typically operates in conjunction with a main speed control (like a Woodward 9907-1290 speed control) and a ProAct actuator. The speed control commands the engine, but the fuel limiter provides an overriding limit on the actuator’s physical position if the commanded fuel level from the 4-20 mA input is lower.

Applications

The Woodward 9907-1291 is commonly used in critical control loops for:

• Gaseous Engine Air/Fuel Ratio Control: Often receives a 4-20 mA signal from an air/fuel ratio controller to precisely limit fuel, ensuring optimal combustion and meeting emission targets.
• Diesel Engine Smoke/Torque Limiting: Can receive signals from turbocharger speed sensors or exhaust opacity meters to limit fuel and prevent excessive smoke or torque, especially during acceleration or transient conditions.
• Power Generation: Used in engine-generator sets to manage load response and prevent engine overload, ensuring stable electrical output.
• Industrial Engine Control: In various industrial applications where precise fuel management is required for performance, efficiency, and environmental compliance.
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Related Products/Series

The Woodward 9907-series encompasses various electronic control modules, and the 8400-series often refers to related ProAct components. Other related part numbers and components in the ProAct ecosystem include:

• 9907-1290: ProAct Model II Digital Speed Control with High Output Sensor Circuit. This would often be the companion speed controller to the 9907-1291 fuel limiter.
• 9907-1289: ProAct Model I Speed Control with High Output Sensor Circuit.
• 8400-055: Another ProAct Fuel Limit module, potentially an older or functionally similar variant.
• ProAct Actuators: Such as ProAct I or ProAct II actuators (e.g., 8256-series), which receive commands from both the speed control and the fuel limiter.
• ProAct Drivers: Intermediate modules (e.g., 8400-706, 8400-703) that provide necessary power and interface capabilities.