9907-838 Woodward speed control module

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Product basic information
Manufacturer: Woodward
Model: 9907-838
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
9907-838 controller has stable performance and high reliability

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9907-838 Woodward speed control module

The 9907-838 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 9907-838
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:
- 9907-838 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.

Input and output of PID controller
Input

The measured (controlled) value of the controlled object – PV, also known as process value; Usually comes from measuring units.

The set value of the controlled object – SP or SV, also known as the set value; Usually comes from the operating unit.

output:

The output value of the PID controller – CO, CV, or MV, also known as the PID output value; Generally output to handheld devices or output cards.
Parameter tuning of PID controller
The parameter tuning of PID controller is the core content of control system design. It determines the proportional coefficient, integration time,

and differentiation time of the PID controller based on the characteristics of the controlled process. There are many methods for tuning

PID controller parameters, which can be summarized into two categories: one is theoretical calculation tuning method. It mainly determines

the controller parameters through theoretical calculations based on the mathematical model of the system. The calculation data obtained by this

method may not be directly usable and must be adjusted and modified through engineering practice. The second is the engineering tuning method,

which mainly relies on engineering experience and is directly carried out in the testing of control systems. The method is simple and easy to master,

and is widely used in engineering practice. The engineering tuning methods for PID controller parameters mainly include critical ratio method, reaction

curve method, and attenuation method. Each of the three methods has its own characteristics, and their commonality is to conduct experiments and then

adjust the controller parameters according to engineering experience formulas. However, no matter which method is used, the controller parameters need to

be finally adjusted and improved in actual operation. The commonly used method now is the critical ratio method. The steps for tuning PID controller parameters

using this method are as follows: (1) Firstly, select a sufficiently short sampling period for the system to operate; (2) Only add a proportional control loop until the

system exhibits critical oscillation in response to the step response of the input. Record the proportional amplification factor and critical oscillation period at this

point; (3) Calculate the parameters of the PID controller through formulas under a certain degree of control.

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: 9907-838 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).
9907-838 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9907-838Suitable 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.