8273-276 Woodward speed control module

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Product basic information
Manufacturer: Woodward
Model: 8273-276
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
8273-276 controller has stable performance and high reliability

Categories: WOODWARD
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8273-276 Woodward speed control module

The 8273-276 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 8273-276
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:
- 8273-276 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.

Stepper Driver Principle Stepper Motor Driver Selection

A stepper driver is an actuator that converts electrical pulses into angular displacement. When the stepper driver receives a pulse signal,

it drives the stepper motor to rotate a fixed angle (called the “step angle”) in the set direction, and its rotation runs step by step at a fixed angle.

By controlling the number of pulses, the angular displacement can be controlled to achieve accurate positioning; At the same time, the speed

and acceleration of the motor can be controlled by controlling the pulse frequency, thus achieving the purpose of speed regulation and positioning.

Widely used in high-resolution large and medium-sized CNC equipment such as carving machines, crystal grinding machines, medium-sized CNC machine tools, EEG embroidery machines,

packaging machinery, fountains, dispensing machines, cutting and feeding systems, etc.

It is a power amplifier that can operate a stepper motor. It can convert the pulse signal sent by the controller into the angular displacement of the

stepper motor. The motor speed is proportional to the pulse frequency, so controlling the pulse frequency can accurately adjust the speed, and controlling the number of pulses can accurately locate.

Principle of stepper driver
1. Constant current drive

Stepper Driver Principle Stepper Motor Driver Selection

The basic idea of constant current control is to control the conduction time of MOSFETs in the main circuit, that is, to adjust the pulse width of MOSFET trigger signals

, in order to achieve the goal of controlling the output driving voltage and thus controlling the motor winding current.

2. Unipolar drive

Unipolar and bipolar are the two most commonly used driving architectures for stepper motors. The unipolar driving circuit uses four transistors to drive the two phases

of the stepper motor. The motor structure, as shown in Figure 1, includes two sets of coils with a center tap. The entire motor has six wires connected to the outside world.

This type of motor is sometimes referred to as a four phase motor, but this term can be confusing and incorrect because it actually only has two phases.

The precise description would be a dual phase six wire stepper motor. Although the six wire stepper motor is also known as a unipolar stepper motor,

it can actually use both unipolar and bipolar driving circuits simultaneously.

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: 8273-276 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).
8273-276 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8273-276Suitable 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.