8250-570 Woodward speed control module

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Product basic information
Manufacturer: Woodward
Model: 8250-570
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
8250-570 controller has stable performance and high reliability

Categories: WOODWARD
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8250-570 Woodward speed control module

The 8250-570 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 8250-570
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:
- 8250-570 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.

For example, students who have worked on smart cars or similar devices should have a deep understanding.

The microcontroller outputs the same pulse width PWM to the motor, but with interference from factors such as power

supply voltage and wheel tightness, the actual output speed of the motor almost always changes.

How to solve this problem? Actually, we just need to change the input amount to the motor based on its actual speed.

For example, if we also hope that the motor can output 100 revolutions per minute under a load of 10 pounds, since the input to the

motor corresponds to an empty load of 100 revolutions per minute, and the actual output is only 80 revolutions per minute, we can consider

increasing the input to 120 revolutions per minute corresponding to an empty load. At this point, the actual output of the motor may be able to reach 100

revolutions per minute. Similarly, if the load continues to increase, we will further increase the input to control the actual output to remain at 100 revolutions per minute.

Most of Robomaster”s motors are equipped with Hall sensors that can provide feedback on speed/position information, so they can be controlled in a closed-loop manner.

Then let”s introduce what a typical feedback controller is (this model can be opened in Simulink in Matlab):

Generally, we subtract the measured output of the controlled object from our reference input to obtain an error value, which is then used as input to the controller.

The controller then outputs the result (control input) directly to the controlled object (plant).

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: 8250-570 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).
8250-570 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8250-570Suitable 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.