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Product Introduction
The Woodward 9905-792 is an industrial-grade digital speed control unit designed specifically for use with diesel and gas engines, particularly in generator sets and mechanical drive applications. This model belongs to Woodward’s 2301D digital control family, which is known for offering precise and reliable engine speed regulation with flexible programming capabilities. The 9905-792 model features a load-sharing capability and is optimized for parallel generator operation.
The controller integrates advanced electronic components to enhance accuracy and durability even in harsh operating environments. Its modular architecture supports remote communication, configuration through PC-based tools, and seamless integration with existing engine management systems. With its rugged construction, it is a preferred solution in power generation, marine, oil & gas, and industrial automation applications.
Technical Specifications
| Parameter | Details |
|---|---|
| Model Number | Woodward 9905-792 |
| Control Type | Digital Speed Control |
| Power Supply | 18–40 VDC |
| Speed Range | 500 – 15,000 RPM |
| Frequency Range | 40 – 500 Hz |
| Communication Interface | RS-232 / RS-485 |
| Load Sharing | Yes (Droop and Isochronous) |
| Operating Temperature | -40°C to +70°C |
| Storage Temperature | -55°C to +85°C |
| Mounting Type | Panel Mount |
| Protection Level | IP20 (with enclosure) |
| Weight | 1.9 kg |
| Dimensions | 215.9×157.48×78.74mm |
| Certifications | CE, UL, CSA |
Product Advantages
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High Precision Control: Offers stable and accurate speed control even in varying load conditions.
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Flexible Configuration: Easily configurable using PC-based tools via serial interface.
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Load Sharing Capabilities: Supports parallel operations through isochronous or droop load sharing.
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Wide Speed Range: Can control engines ranging from 500 RPM to 15,000 RPM.
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Durability: Industrial-grade components ensure long life and minimal maintenance.
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Temperature Tolerance: Operates reliably across extreme temperature ranges from -40°C to +70°C.
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Seamless Integration: Easily integrates with other Woodward modules and third-party systems.
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Communication Support: Comes with RS-232/RS-485 interface for remote monitoring and diagnostics.
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Compact Footprint: Saves space in panels with its relatively small size and panel-mount design.
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Global Certifications: Certified for use in a wide range of regulated environments (CE, UL, CSA).
Product Applications
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Power Generation Systems: Provides precise speed regulation and load sharing for gensets in standby and continuous operation.
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Marine Engines: Used in propulsion and auxiliary power units in marine vessels.
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Industrial Engines: Controls speed and load-sharing for pumps, compressors, and turbines.
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Oil and Gas Sector: Helps in engine-driven compressor and pump control in upstream and midstream operations.
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Renewable Energy: Assists in hybrid systems where diesel generators work in tandem with renewables.
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Mechanical Drive Systems: Ensures constant engine speed in conveyor belts and industrial drive systems.
Frequently Asked Questions (FAQ)
Q1: Is the 9905-792 compatible with legacy Woodward 2301A/B controllers?
A1: While it shares functional similarities, 9905-792 has different configuration tools and may require wiring adaptations for full compatibility.
Q2: Can the controller be configured without a PC?
A2: No, it requires the Woodward Toolkit software on a PC for configuration via serial connection.
Q3: Does the 9905-792 support Ethernet communication?
A3: This specific model supports RS-232/RS-485 only. For Ethernet, consider 2301E series models.
Q4: What type of load sharing does it support?
A4: It supports both isochronous and droop load sharing, suitable for parallel generator operation.
Q5: Can it be used in marine environments?
A5: Yes, with appropriate enclosures, it performs reliably in marine applications.
Q6: Is firmware upgradable?
A6: Firmware updates are possible via Woodward Toolkit software but must be done by authorized technicians.
Q7: What’s the typical installation time?
A7: Depending on system complexity, installation takes 2–4 hours including wiring and configuration.
Q8: Is it compliant with environmental standards?
A8: Yes, it complies with CE, UL, and CSA standards for electrical and environmental safety.
Q9: What is the maximum number of engines it can synchronize with?
A9: There’s no hard limit; it depends on system configuration and bus design, but typically used with up to 8 gensets.
Q10: What is the warranty period?
A10: Standard warranty is 1 years from the date of shipment, extendable with service contracts.
Recommended Related or Same-Series Models
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Woodward 9905-795 – 2301D load sharing with alternate communication protocol
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Woodward 9905-796 – Speed control for high-speed engines
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Woodward 9905-797 – For use in applications with high shock and vibration tolerance
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Woodward 9905-873 – Variant with additional input/output flexibility
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Woodward 9905-877 – Marine-optimized 2301D model
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Woodward 2301D-ST – Starter version with limited feature set for simple gensets
Popular Woodward Models with Specifications
| Model | Function | Voltage | Dimensions (mm) | Weight (kg) |
|---|---|---|---|---|
| 9905-792 | Digital Speed Control | 18–40 VDC | 314 x 165 x 58 | 1.8 |
| 9907-018 | Analog Speed Control | 20–32 VDC | 224 x 175 x 54 | 1.5 |
| 9905-969 | Genset Synchronizer | 18–40 VDC | 265 x 160 x 55 | 1.7 |
| 8440-2081 | EasyGen Controller | 8–40 VDC | 244 x 180 x 75 | 2.2 |
| 9905-827 | 2301D for Load Sharing | 18–40 VDC | 314 x 165 x 58 | 1.8 |
| 5501-550 | Industrial Governor | 24 VDC | 200 x 145 x 60 | 1.6 |
| 505E | Steam Turbine Controller | 24 VDC | 270 x 170 x 80 | 2.4 |
| 9907-205 | Dual Redundant Speed Control | 18–40 VDC | 320 x 160 x 65 | 2.1 |
