Description

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　　9907-252  Other Names:

Control Unit 9907-252

9907-252 Load Balancing Module

Load Sharing Module 9907-252

The Woodward 9907-252 is a Load Sharing Module (LSM) manufactured by Woodward Corporation, USA. It is specifically designed for generator sets and supports both isochronous and droop load sharing modes. This module integrates with the digital speed control of the Caterpillar generator through pulse width modulation (PWM) input, making it suitable for scenarios where multiple generators operate in parallel, ensuring balanced load distribution and stable system operation.

　　Product Positioning and Core Functions

The Woodward 9907-252 is a Load Sharing Module (LSM) manufactured by Woodward (a globally renowned company in industrial control). Designed specifically for generator sets, it enables load balancing when multiple generators are operating in parallel. Its core functions include:

Isochronous and Droop Load Sharing: Supports precise load distribution, ensuring stable output from parallel generators under varying loads.

Compatible with Caterpillar Motors: Adapts to Caterpillar motors equipped with digital speed control, supporting PWM (Pulse Width Modulation) input.

Integrated Communication Capabilities: Equipped with a communication interface, it can be integrated with Woodward SPM-A synchronizers, automatic generator control modules, and other devices to achieve remote monitoring and data exchange.

Input/Output: Supports three-phase PT (voltage transformer) and CT (current transformer) inputs; PT voltage range 95-130V AC (line-to-line); CT full-load current 3-7A RMS; output is PWM (pulse width modulation) signal, compatible with Caterpillar engine digital speed control.

Power Requirements: DC input 18-32V DC; operating temperature -40°C to 70°C (-40°F to 158°F); surge protection up to 40G (11ms sawtooth pulse).

Physical Dimensions: 273.6mm × 59.2mm × 214.1mm; weight approximately 1.36 kg; rack mounting supported.

Communication Interface: Equipped with a communication interface, allowing integration with devices such as the Woodward SPM-A synchronizer for remote monitoring and control.

　　Load Sharing Mode

Isochronous Mode: Maintains constant generator speed, ensuring precise power distribution among parallel units.

Droop Mode: Achieves load balancing by adjusting output voltage/frequency, adapting to fluctuating load scenarios.

Integration and Compatibility:

Supports seamless integration with engines and control modules from brands such as Caterpillar and Woodward.

Expandable to include accessories such as SPM-A synchronizers and automatic power converters to enhance system functionality.

High-Precision Control: Employs advanced algorithms for high-precision load distribution, adapting to dynamic changes in the generator set.

Environmental Adaptability: Designed for harsh industrial environments (such as ships and power plants), possessing high reliability and durability.

Protection Mechanisms: Built-in overspeed testing, critical speed avoidance, and valve position limiting functions ensure safe operation of the equipment.

Environmental Tolerance: Passes wide temperature testing from -40°C to 85°C, resistant to electromagnetic interference, suitable for harsh environments such as ships, oil fields, and data centers.

　　Technical Specifications and Parameters

Electrical Parameters:

Input Voltage: 18-32 VDC (DC power supply), PT input range 95-130 VAC (three-phase), CT input 3-7 A RMS at full load.

Output Type: PWM signal, suitable for Caterpillar engine control requirements.

Physical Characteristics:

Dimensions: 273.6 mm × 59.2 mm × 214.1 mm (L×W×H), weight approx. 1.36 kg, rack-mountable.

Operating Temperature: -40°C to 70°C (-40°F to 158°F), suitable for harsh industrial environments.

Protection and Reliability:

Features overspeed protection, critical speed avoidance, and load gain adjustment to ensure system safety and stability.

Shock Resistance: Withstands 40G shocks (11ms sawtooth pulse), extended service life through high-reliability design.

　　Application Scenarios and Industry Value

Power Generation: Widely used in power plants and data center backup power systems to ensure load balancing and improve power supply stability when multiple generators are connected in parallel.

Marine and Marine Engineering: Used in marine propulsion systems to optimize generator operating efficiency and ensure the safety of ship power supply.

Industrial Automation: Enables intelligent load distribution and remote control of generator sets in power systems in industries such as oil, gas, and chemicals.

Data Centers and Emergency Power: Enables smooth switching and load distribution between generators and mains power in UPS uninterruptible power supply systems.

Renewable Energy Systems: Coordinates load sharing between traditional generators and renewable energy generation in wind power and photovoltaic grid-connected projects.

　　Additional Advantages

Modular Design: Facilitates rapid installation and maintenance, reducing system downtime.

Environmental Adaptability: High protection level design, resistant to harsh environments such as high temperature, high humidity, and strong electromagnetic interference.

Technical Support: Woodward provides comprehensive after-sales support, including installation and commissioning, fault diagnosis, and spare parts supply, ensuring long-term stable operation for users.

In summary, the Woodward 9907-252 load balancing module, with its high-precision control, wide environmental adaptability, and powerful integration capabilities, has become the preferred solution for generator load sharing. It is widely used in industries such as manufacturing, marine, energy, and data centers, effectively improving system efficiency and reliability, and is a core component ensuring stable power supply to critical facilities.

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