9905-797 Woodward speed control module

The 9905-797 is a microprocessor-based digital governor controller produced by Woodward, belonging to its classic 505 series.
It is primarily designed for speed control and protection of steam turbines. Below is a detailed introduction to this product:

I. Product Overview

• Brand and Model: Woodward 9905-797
• Series: 505 Series Digital Governor
• Type: Microprocessor-based controller
• Purpose: Specifically designed for steam turbines to control their speed and provide overspeed protection.
• 

II. Core Functions

1. Speed Control:
   • 9905-797 Precisely controls the speed of steam turbines by adjusting steam inlet flow.
   • Supports single-range or split-range actuators to accommodate turbines of different sizes.
2. Overspeed Protection:
   • Incorporates triple independent overspeed protection logic to ensure rapid shutdown in case of overspeed, preventing equipment damage.
   • Provides an overspeed test button for convenient on-site testing of protection functions.
3. Emergency Shutdown:
   • Equipped with an emergency stop button for immediate shutdown in emergency situations.
4. System Protection:
   • • Automatically switches control modes upon sensor failure to ensure uninterrupted system operation.
     • Offers local/remote control priority selection to adapt to different operational scenarios.

   
   

III. Technical Specifications

• Power Supply: 18-32 VDC, supporting 24VDC input.
• Display: Two-line x 24-character LED display for clear indication of operating status and parameters.
• Enclosure: NEMA 4X or IEC 60529 IP56 rated for protection against harsh industrial environments.
• Inputs/Outputs:
  • Inputs: 6 programmable current inputs, 16 discrete contact inputs.
  • Outputs: 2 actuator outputs, 8 relay outputs, 6 programmable current outputs.
• Communication Interfaces:  9905-797 Supports RS-232, RS-422, and RS-485 hardware interfaces for easy integration with host computers or other devices.
• Software: Equipped with OpView™ and 505View software for parameter configuration, monitoring, and fault diagnosis.
• Operating Temperature: -20 to +60°C (some models support -4 to +140°F).
• Storage Temperature: -40 to +85°C (some models support -40 to +185°F).
• 9905-797 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

• Steam Turbine Control:  9905-797Suitable for steam turbines of various sizes, including industrial steam turbines, small grid turbo-generators, and turboexpanders.
• Single Extraction and Admission Applications: Designed for operating steam turbines in single extraction and/or admission applications.
• On-Site Programming: Allows on-site operators to program and adjust parameters through an integrated operator control panel, adapting to different operating conditions.

V. Product Advantages

1. High Reliability:
   • Microprocessor-based design ensures precise control and stability.
   • Triple independent overspeed protection logic provides multiple layers of safety.
2. Flexibility:
   •  Supports various actuator and sensor configurations to accommodate different turbine models.
   • Offers a rich set of input/output interfaces for easy system expansion and integration.
3. Ease of Use:
   • Two-line x 24-character LED display provides an intuitive operating interface.
   • A 30-key multifunctional keyboard simplifies parameter configuration and operation.
4. Compatibility:
   • Supports multiple communication protocols for easy integration with DCS, PLC, and other systems.
   • Provides OpView™ and 505View software for remote monitoring and fault diagnosis.

9905-797 PDF

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