8250-501 Woodward overspeed protector

Price:

Product basic information
Manufacturer: Woodward
Model: 8250-501
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
8250-501 controller has stable performance and high reliability

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8250-501 Woodward overspeed protector

The 8250-501 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 8250-501
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:
- 8250-501 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.

In many products, such as microwave ovens, the requirements for microcontroller performance are very low, and price is the

main consideration factor. In this situation, manufacturers began designing dedicated microcontroller chips – an embedded

central processing unit designed specifically for low cost, small size, and low power consumption. Motorola 6811 and Intel 8051 are

both successful examples of this type of chip. In addition, there is a series of controllers called “PIC microcontrollers” produced by Microchip,

which are also very popular. By today”s standards, these central processing units are unbelievably simple; But the price for

bulk purchases is very low, and often only one piece is needed to meet the needs of product designers.

A typical low-end microcontroller chip has approximately 1000 bytes of read-only memory and 20 bytes of random access memory, with 8 input/output pins.

Mass production of this chip costs only a few cents per unit. Of course,

you can”t expect to run programs like Microsoft Word on this chip – because Microsoft Word requires about 30 megabytes of random access storage space and

a processor that can execute millions of instructions per second. However, controlling a microwave oven does not require a complex program like Microsoft Word.

What you need to accomplish with a microcontroller is a specific task, and low-cost, low-power operation is the most important.

Application of Microcontrollers
In the article on the working principle of electronic gates, you learned about the 7400 series TTL (transistor logic circuit) components, where to purchase them,

and how to assemble them. You will find that implementing a simple device usually requires many gate circuits. For example, in the digital clock section, the clock

we designed may require 15 to 20 chips. One of the main advantages of microcontrollers is that software (the small program you write and execute on the controller)

can replace many gate circuits. Therefore, in this article, we will use a microcontroller to create a digital clock. This will be a very expensive digital clock (nearly $200!),

but in the process, you will accumulate various knowledge needed to use microcontrollers in the coming years. Even if you don”t actually make such a digital clock, reading related content can benefit you a lot.

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: 8250-501 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).
8250-501 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8250-501Suitable 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.