9907-994 Woodward overspeed protector

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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
Tags: - Actuator 9907-994 controller debugger module Motor touch screen WOODWARD

9907-994 Woodward overspeed protector

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.

3. Gradual adjustment: When adjusting the current, the current value should be gradually increased or decreased, and the operating status and response

of the equipment should be observed to avoid damage caused by overcurrent or overload.

4. Monitoring current: When adjusting the current controller, measuring tools such as ammeters should be used to monitor the current value in real time

to ensure that the current fluctuates within the allowable range.

5. Maintain ventilation: When adjusting the current controller, attention should be paid to maintaining good ventilation around the equipment to avoid

equipment damage or performance degradation due to overheating.

6. Regular maintenance: Regular maintenance and inspection of the current controller can promptly detect and solve potential problems, ensuring the

normal operation of the equipment and extending its service life.

V. Summary

The regulation of current controller is a very important link in electronic devices and power systems. By adjusting parameters such as resistance,

capacitance, inductance, and voltage, precise control of current in the circuit can be achieved. In specific application scenarios, such as electric vehicles,

industrial equipment, household appliances, and electronic musical instruments, the adjustment methods of current controllers may vary. Therefore,

when adjusting the current controller, it is necessary to fully understand the working principle and control requirements of the equipment, and follow the

operating guidelines of the equipment manufacturer. At the same time, attention should also be paid to safety first, gradual adjustment, monitoring of current,

maintaining ventilation, and regular maintenance to ensure the normal operation of equipment and extend its service life.

Through the discussion in this article, it is believed that readers have gained a deeper understanding of the adjustment methods of current controllers. In practical

operation, appropriate adjustment methods should be selected according to specific application scenarios and requirements, and relevant operation guidelines and safety

regulations should be followed to ensure the correct adjustment of the current controller and the stable operation of the equipment.

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.