9905-970 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 9905-970
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
9905-970 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-970 controller debugger module Motor touch screen WOODWARD

9905-970 Woodward turbine controller

The 9905-970 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 9905-970
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:
- 9905-970 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.

Classification and Application of Drivers

The driver is a crucial part of the motor control system, responsible for converting control signals into electrical energy output to drive the motor

to operate normally. According to the different types and application scenarios of motors, drivers can be divided into brushed motor drivers,

brushless motor drivers, stepper motor drivers, and servo motor drivers.
The brushed motor driver is driven by an H-bridge circuit, which consists of a core circuit H-bridge and some peripheral circuits to form

a DC brushed motor driver. Brushed motor drivers are divided into integrated circuit form and discrete component form. The H-bridge

in the form of integrated circuits is suitable for applications with small to medium power requirements, while the H-bridge in the form

of discrete components is suitable for applications with high or ultra-high power requirements. It should be noted that the pins of MCU

cannot directly drive MOS transistors and other components, and a dedicated MOS transistor driver chip needs to be added.
Brushless motor drivers also use H-bridge circuits for driving, but each phase is driven by a half bridge circuit, requiring a total

of three half bridges. Brushless motor drivers

are also divided into integrated circuit form and discrete component form, but the discrete component form only separates the half

bridge circuit. Brushless motor drivers can achieve commutation operations and are suitable for applications that require high precision.

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: 9905-970 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).
9905-970 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-970Suitable 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.