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Woodward 9906-739
Product Name: Woodward 9906-739 Speed Control & Load Sharing Controller
Product Introduction: This controller acquires pulse signals from a magnetic speed pickup to calculate actual speed, performs a differential calculation with the set speed, and outputs a corresponding drive current to control the fuel actuator for fuel quantity adjustment. In multi-unit parallel operation, it reads the load signals of other units on the bus and dynamically adjusts the output to achieve uniform load distribution.
Detailed content
Technical Specifications:
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Power Supply: Must not exceed 40 VDC (overvoltage will burn out the power driver circuit)
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Speed Sensing: Magnetic pickup pulse input
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Drive Output: Proportional actuator drive current output
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Operating Temperature: Industrial control cabinet internal application
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Enclosure Rating: Must be installed inside a sealed industrial control cabinet; not directly mountable on the engine body
Functional Features:
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Closed-loop speed control via magnetic pickup signal acquisition and differential calculation
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Dynamic output correction based on load signals from other units on the bus for multi-machine parallel load sharing
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Local fault status indication
Application Scenarios: Used in parallel control systems for generator sets driven by diesel engines, gasoline engines, steam turbines, or gas turbines.
Material Composition: Industrial-grade circuit board with power driver circuitry, housed in a metal enclosure.
Structural Features: Cabinet-embedded installation structure.
Working Principle: Acquires pulse signals from the magnetic speed pickup to calculate actual speed, performs a differential calculation with the set speed, and outputs a corresponding drive current to control the fuel actuator for fuel quantity adjustment. In multi-unit parallel operation, it reads the load signals of other units on the bus and dynamically adjusts the output to achieve uniform load distribution.
Installation Requirements:
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Must be installed inside a sealed industrial control cabinet; direct mounting on the engine body is prohibited
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Keep away from strong electromagnetic interference sources such as high-voltage cables and contactors; maintain a distance of at least 15 cm from heat-generating devices
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Vertical installation of the unit is required, with a maximum allowable tilt angle of ±45°; maintain a ventilation clearance of ≥30 mm around the unit
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Speed sensors must use shielded twisted-pair cable, with the shield grounded at a single point (grounding at both ends is prohibited)
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An independent disconnect switch must be configured inside the control cabinet as a power-down protection device
Usage Precautions:
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Anti-static protection must be observed when assembling/disassembling circuit boards; static electricity will directly damage the chips on the board
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Supply voltage must never exceed 40 VDC; overvoltage will burn out the power driver circuit
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This controller does not include independent overspeed protection; the system must be equipped with an independent hardware overspeed shutdown device, and overspeed protection must not rely on this controller
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Strictly distinguish power polarity during wiring; reverse connection will cause direct hardware damage
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In humid or salt-spray environments, an additional moisture-proof and anti-corrosion control cabinet is required; the device body does not support direct outdoor use
