9907-994 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 9907-994
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
9907-994 controller has stable performance and high reliability

Categories: WOODWARD
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9907-994 Woodward turbine controller

The 9907-994 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 9907-994
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:
- 9907-994 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.

closed-loop control

In order to achieve more precise control effects, a closed-loop control method is usually used between the PLC and the driver. In this way,

the PLC continuously adjusts the control signal output to the driver based on the preset program and feedback signals from the equipment,

thereby achieving precise control of the equipment”s operating status. This closed-loop control method can greatly improve the stability and accuracy of the control system.

Fault handling and alarm

When the device malfunctions, the driver can detect the abnormal situation and issue an alarm signal. After receiving these alarm signals, the

PLC will execute corresponding fault handling procedures, such as stopping the machine, switching to backup equipment, etc., to ensure the

normal operation of the production line. At the same time, PLC can also store fault information and output it to the human-machine interface or monitoring system for operators to view and process.

V. Summary

In summary, PLC and drivers play important roles in industrial automation control systems and cooperate with each other to achieve precise

control goals. PLC, as the “brain” of the control system, is responsible for receiving external signals, executing preset programs, and outputting

control signals; And the driver acts as a “muscle” responsible for receiving control signals and converting them into actual power to drive the

equipment to work. Through collaborative methods such as signal transmission and conversion, closed-loop control, and fault handling and alarm,

PLC and drivers jointly ensure the stability and efficiency of industrial automation control systems.

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: 9907-994 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).
9907-994 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9907-994Suitable 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.