A9904-060 Woodward ProTech 203

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Product basic information
Manufacturer: Woodward
Model: A9904-060
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
A9904-060 controller has stable performance and high reliability

Categories: WOODWARD
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A9904-060 Woodward ProTech 203

The A9904-060 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 A9904-060
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:
- A9904-060 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.

Servo drive control mode
1. Feedback compensation type open-loop control
The accuracy of open-loop systems is relatively low due to the step error, start stop error, and mechanical system error of servo drives,

which directly affect the positioning accuracy. Compensation type improvement should be adopted, which has the advantages of both open-loop and

closed-loop systems, namely open-loop stability and closed-loop accuracy. It will not cause system oscillation due to resonance frequency, crawling, or loss

of motion of the machine tool. Feedback compensation type open-loop control does not require gap compensation and pitch compensation.

2. Closed-loop control
Due to the inability of open-loop control to meet the requirements of machine tools, the most fundamental way to improve the control accuracy of servo drives is to adopt closed-loop

control. There is not only a predecessor control channel, but also a feedback channel for detecting output. After comparing the command signal with the feedback signal,

a deviation signal is obtained, forming a closed-loop control system with deviation control.

3. Semi closed loop control
For closed-loop control systems, reasonable design can achieve reliable stability and high accuracy, but directly measuring the position signal of the workbench requires the use of position detection

devices with high installation and maintenance requirements, such as gratings, magnetic rulers, or linear induction synchronizers. By measuring the angular displacement of the

transmission shaft or screw, the equivalent feedback signal of the position output can be indirectly obtained. Due to the fact that the errors caused by this part of the transmission

cannot be automatically compensated by the closed-loop system without including the transmission chain from the rotating shaft to the worktable, the errors caused by this part

of the transmission cannot be automatically compensated by the closed-loop system. Therefore, this closed-loop control system composed of equivalent feedback signals is

called a semi closed loop servo drive, and this control method is called a semi closed loop control method.

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: A9904-060 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).
A9904-060 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: A9904-060Suitable 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.