9905-964 WOODWARD Debugger unit

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Product basic information
Manufacturer: Woodward
Model: 9905-964
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
9905-964 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-964 controller debugger module Motor touch screen WOODWARD

9905-964 WOODWARD Debugger unit

The 9905-964 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 9905-964
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:
- 9905-964 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.

What is a motor driver

A motor driver is simply a switch, because the motor drives a large current or voltage, and when ordinary switches or electronic components cannot be

used as switches to control the motor, a so-called driver must be added to control the motor.

The function of a motor driver: The function of a motor driver refers to controlling the idle speed of a motor by controlling the rotation angle and operating

speed of the motor to achieve control over the duty cycle.

Principle circuit diagram of motor drive circuit: The motor drive circuit can be driven by relays or power transistors, or by thyristors or power type MOSFETs.

In order to adapt to different control requirements (such as motor operating current, voltage, motor speed regulation, forward and reverse control of DC

motors, etc.), different types of motor drive circuits must meet relevant requirements.

The electric vehicle does not start when powered on, making it difficult to push and accompanied by a “clacking” sound. The occurrence of this situation is

caused by a short circuit in the motor wire due to virtual contact. It is difficult to remove the three coarse phase wires of the motor and push the cart, indicating

that the controller is broken and needs to be replaced in a timely manner. If the implementation is still difficult, it indicates that there is a problem with the motor, which may be caused by a short circuit and burning of the motor coil.

Regarding the issue of drivers, this article focuses on what drivers are and what motor drivers are. It can be seen that drivers are a broad concept, and the

drivers used in different machines are different. Therefore, to understand the concept of drivers, it is necessary to consult specific materials for different hardware.

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: 9905-964 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).
9905-964 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-964Suitable 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.