9905-764 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 9905-764
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
9905-764 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-764 controller debugger module Motor touch screen WOODWARD

9905-764 Woodward turbine controller

The 9905-764 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 9905-764
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:
- 9905-764 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.

Application of New Materials in Gate Drivers
1. Wide bandgap semiconductor materials
In recent years, wide bandgap semiconductor materials such as silicon carbide (SiC) and gallium nitride (GaN) have attracted much

attention due to their excellent electrical and thermal properties. These materials have the characteristics of high breakdown

electric field, high thermal conductivity, and low switching loss, making them very suitable for manufacturing high-performance gate drivers.

Silicon carbide (SiC): SiC MOSFETs have higher operating temperatures, lower on resistance, and faster switching speeds,

allowing SiC based gate drivers to operate in high temperature, high power density environments while reducing energy loss

and improving efficiency. SiC gate drivers have shown great potential for applications in fields such as electric vehicles and solar inverters.
Gallium Nitride (GaN): GaN power devices are known for their ultra-low switching losses and high-speed switching capabilities.

GaN based gate drivers can achieve higher switching frequencies and smaller volumes, making them highly suitable for compact design

applications such as high-frequency power supplies and wireless chargers.
2. Advanced packaging technology
With the continuous advancement of packaging technology, the packaging forms of gate drivers have become more diverse and efficient.

For example, 3D packaging technology can vertically stack multiple chips, greatly reducing packaging volume and improving heat dissipation

performance. In addition, System in Package (SiP) technology integrates gate drivers with other related circuits to form highly integrated functional modules,

further simplifying system design and improving reliability.

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: 9905-764 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).
9905-764 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-764Suitable 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.