9905-768 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 9905-768
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
9905-768 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-768 controller debugger module Motor touch screen WOODWARD

9905-768 Woodward turbine controller

The 9905-768 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 9905-768
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:
- 9905-768 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.

Motor driver solutions and building drivers from discrete components

Motor drivers are essential for controlling motors in all devices from office printers to fans. With the increasing complexity of motor applications, the functionality

of motor drivers is also expanding. Although using discrete components to assemble motor drives has been effective in the past, more and more engineers are turning to

complete motor drive solutions that are included on a single chip.

Understand motor drivers
The motor driver serves as the interface between the DC motor and its control circuit. These drivers receive low current signals from the control circuit and amplify them to

generate high current signals required to drive the motor. Over the years, various methods have been used to create motor drivers, with H-bridge circuits being the most common. At least

, the H-bridge driver can turn on and off the motor and reverse its direction. However, for more advanced applications such as robot vacuum cleaners and DSLR cameras,

better control and circuit protection are needed.
Discrete component motor driver
The traditional method for motor drivers is to assemble them using discrete components, with the most common being the basic H-bridge. The name “H-bridge” comes from the H-shaped

configuration formed by four switches, which are the core of its functionality. The basic H-bridge motor driver circuit typically includes four switches made of MOSFETs or P-channel and N-channel BJTs.

However, please remember that the described H-bridge components will constitute the minimum required for a simple driver program. Due to the involvement of efficiency, noise,

vibration, circuit protection, and electromagnetic interference,

motor driver circuits have become more complex, and engineers must also consider input and output interfaces. In short, drivers for applications such as industrial printers or camera autofocus require more than just basic H-bridge functionality.

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: 9905-768 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).
9905-768 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-768Suitable 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.