8440-1955 Woodward ProTech 203

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Product basic information
Manufacturer: Woodward
Model: 8440-1955
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
8440-1955 controller has stable performance and high reliability

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8440-1955 Woodward ProTech 203

The 8440-1955 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 8440-1955
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:
- 8440-1955 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.

Composition of motion controller architecture
A motion controller is used to generate feedback loops for trajectory points (expected output) and closed positions. Many controllers can also close a

speed loop internally. A driver or amplifier is used to convert the control signal (usually speed or torque signal) of a motion controller into a higher power

current or voltage signal. More advanced intelligent drives can close their own position and speed loops to achieve more precise control. An actuator such

as a hydraulic pump, cylinder, linear actuator, or motor is used to output motion. A feedback sensor such as a photoelectric encoder, rotary transformer

, or Hall effect device is used to provide feedback on the position of the actuator to the position controller, in order to achieve closure of the position control loop.

Numerous mechanical components are used to convert the motion form of the actuator into the desired motion form, including gearboxes, shafts, ball screws,

toothed belts, couplings, and linear and rotary bearings. Typically, the functions of a motion control system include speed control and point-to-point control.

There are many methods to calculate a motion trajectory, usually based on a velocity curve such as a triangular velocity curve, trapezoidal velocity curve, or

S-shaped velocity curve. Such as electronic gears (or electronic camshafts). That is to say, the position of the driven shaft mechanically follows the position

change of an active shaft. A simple example is that a system consists of two turntables that rotate according to a given relative angular relationship. Electronic

cam is more complex than electronic gear, as it makes the following relationship curve between the driving shaft and the driven shaft a function. This curve can be non-linear, but it must be a functional relationship.

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: 8440-1955 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).
8440-1955 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8440-1955Suitable 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.