9905-768 Woodward overspeed protector

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Product basic information
Manufacturer: Woodward
Model: 9905-768
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
9905-768 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-768 controller debugger module Motor touch screen WOODWARD

9905-768 Woodward overspeed protector

The 9905-768 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 9905-768
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:
- 9905-768 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.

Step 2: Check the software architecture

The software architecture and requirements have a significant impact on the selection of microcontrollers. The severity of the processing requirements

determines whether to use an 80 MHz DSP or an 8 MHz 8051. Like hardware, all important requirements should be noted down.

Step 3: Select Architecture

Using the information from steps 1 and 2, engineers should be able to have a preliminary idea of the required architecture. Can the application be

implemented through an 8-bit architecture? Where are the 16? Do you still need a 32-bit ARM core? These issues will begin to converge into a solution

between the application and the required software algorithms. Don”t forget about possible future requirements and functional extensions.

Just because 8-bit microcontrollers can meet your current requirements, you cannot disregard 16 bit microcontrollers for future functionality or ease of use.

Please remember that microcontroller selection can be an iterative process.

You may choose a 16 bit period in this step, but later find that 32-bit ARM components are more suitable. This step only allows engineers to determine the correct direction of progress.

Step 4: Determine Memory Requirements

For any microcontroller, flash memory and RAM are two very important components. Ensuring that there is no shortage of program space, or variable space

, is definitely the top priority. When selecting components, it is easy to choose components with excessive functionality rather than those with insufficient functionality.

At the end of the design, it is not uncommon to find that 110% of the space is needed or some features need to be reduced. After all, you always start by wanting more

and then move on to limiting slightly more components within the same chip family.

By utilizing the software architecture and communication peripherals included in the application, engineers can estimate the required flash and RAM sizes for the

application. Remember to leave some space for feature extensions and future versions! This can save a lot of trouble for the future.

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: 9905-768 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).
9905-768 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-768Suitable 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.