9905-971 Woodward ProTech 203

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Product basic information
Manufacturer: Woodward
Model: 9905-971
Belonging to the famous 505 series
Supports multiple communication protocols and can be smoothly integrated with the existing control system of the factory
Core application: Designed specifically for speed control and protection of steam turbines
9905-971 controller has stable performance and high reliability

Categories: WOODWARD
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9905-971 Woodward ProTech 203

The 9905-971 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 9905-971
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

Speed Control:
- 9905-971 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.
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.
Emergency Shutdown:
- Equipped with an emergency stop button for immediate shutdown in emergency situations.
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.

How to choose a microcontroller?

Choosing the right microcontroller for a product can be a daunting task. You not only need to consider many technical features,

but also business aspects such as cost and stocking time that may weaken the project.

In the early stages of a project, you may have an immediate urge to start choosing a microcontroller before agreeing on the

details of the system, which is certainly a bad idea.
Before any thinking about microcontrollers, hardware and software engineers should first develop high-level specifications for the system,

draw diagrams and flowcharts, and only then have sufficient information to make rational decisions about microcontroller selection.

At this stage, you can follow 10 simple steps to ensure making the right choice.

Step 1: Develop a list of required hardware interfaces

Develop a list of all external interfaces that the microcontroller needs to support using the overall hardware diagram. There are generally

two types of interfaces that need to be listed. The first type of interface is the communication interface, which includes peripheral interfaces such as USB, I2C, SPI, and UART.

If the application requires USB or some form of Ethernet, make a special note. These interfaces have a significant impact on the program space

size that microcontrollers need to support. The second type of interface includes digital input and output, analog-to-digital input, and PWM interface.

These two interface types will indicate the number of pins required by the microcontroller. Figure 1 shows a general example block diagram that lists the I/O requirements.

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: 9905-971 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).
9905-971 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-971Suitable 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

High Reliability:
- Microprocessor-based design ensures precise control and stability.
- Triple independent overspeed protection logic provides multiple layers of safety.
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.
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.
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.