9905-918 Woodward ProTech 203

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Product basic information
Manufacturer: Woodward
Model: 9905-918
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
9905-918 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-918 controller debugger module Motor touch screen WOODWARD

9905-918 Woodward ProTech 203

The 9905-918 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 9905-918
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:
- 9905-918 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.

A hybrid motion controller is assembled from a motion controller and a servo drive, which has the advantages of an independent

motion controller and can also connect multiple servo drives together through various methods and protocols for coordinated control.

Motion controllers are classified based on the principle of position control:

Motion controllers can be divided into three basic types based on the principle of position control, namely the presence or absence of

detection feedback sensors and their detection devices: open-loop, semi closed loop, and closed-loop motion controllers.

1. Open-loop control motion controller

There is no position detection feedback device, and its execution motor generally uses a stepper motor. The biggest features of this type

of motion controller are convenient control, simple structure, and low price. The displacement command signal flow issued by the motion

controller is unidirectional, so there is no stability issue. However, due to the lack of feedback correction for mechanical transmission errors,

the position accuracy is generally not high.

2. Semi closed loop control motion controller

The position feedback adopts a corner detection element, which is directly installed at the end of the servo motor or screw. Due to its

position feedback control, high positioning accuracy can be achieved, and most mechanical transmission components are

not included in the closed-loop system, thus obtaining relatively stable control characteristics. Mechanical transmission errors such as lead screws cannot be

corrected through feedback, but software fixed value compensation can be used to appropriately improve their accuracy.

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: 9905-918 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).
9905-918 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-918Suitable 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.