8250-421 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 8250-421
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
8250-421 controller has stable performance and high reliability

Categories: WOODWARD
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8250-421 Woodward turbine controller

The 8250-421 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 8250-421
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:
- 8250-421 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.

The programs in microcontrollers are usually stored in EPROM or EEPROM. This is a non-volatile memory (the program does not disappear when the

device is turned off) that can be continuously erased and rewritten.

Application of microcontroller

Many devices use microcontrollers. Some examples:

The anti-theft alarm includes a microcontroller chip that is connected to a keyboard, display, and sensor/contact inputs. Microcontrollers are usually self-contained chips,

while ALU (arithmetic logic unit), memory, and I/O are all included in one integrated circuit

Early automatic washing machines used cam switches to sort operations during the washing cycle. This is a rather complex switch installed at the end of the knob shaft that you

use to select the cleaning program. Newer machines use microcontrollers to sort operations. Other devices such as microwave ovens and dishwashers may include microcontrollers

The TV uses a microcontroller to process channel selection and read the status of buttons on the TV

Microcontrollers are used for engine control and displaying information on the vehicle”s dashboard

Digital cameras use microcontrollers to process input from buttons, control image capture and display.

Single chip microcontroller example

Some commonly used microcontrollers:

Zilog Z8

Intel 8051

Texax Instruments TIMSP430

Atmel AVR

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: 8250-421 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).
8250-421 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8250-421Suitable 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.