9905-971 Woodward turbine controller

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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
Tags: - Actuator 9905-971 controller debugger module Motor touch screen WOODWARD

9905-971 Woodward turbine controller

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.

Working principle of microcontroller
Today, the shadow of microcontrollers can be seen in a large variety of products. If your microwave oven has light-emitting diodes,

LCD screens, and operation buttons, then it is equipped with a microcontroller. Nowadays, all cars are equipped

with at least one microcontroller, some up to six to seven: the engine, anti lock braking system, and cruise control all rely on the control

of the microcontroller. Almost any device equipped with a remote control is equipped with a microcontroller: televisions, video recorders, and high-end stereo systems

all belong to this category. You should have some understanding of precision DSLR cameras, digital cameras, mobile phones,

portable cameras, telephone answering machines, laser printers, telephones with caller ID and number storage functions, pagers, fully functional refrigerators

, dishwashers, washing machines, and dryers with display screens and operating keyboards. In general, any product or device that requires interaction with users has a built-in microcontroller.
In this article, we will explore microcontrollers to help you understand their nature and working principles. Afterwards, we will further introduce how to personally

use the microcontroller. Let me reveal in advance that we will be making a digital clock with a microcontroller! In addition, we will also create a digital thermometer.

Throughout the process, you will learn a lot about how microcontrollers can be applied to commercial products.

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.