9905-703 WOODWARD Debugger unit

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Product basic information
Manufacturer: Woodward
Model: 9905-703
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
9905-703 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-703 controller debugger module Motor touch screen WOODWARD

9905-703 WOODWARD Debugger unit

The 9905-703 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 9905-703
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:
- 9905-703 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、 The functions of PLC and drivers in control systems

Functions of PLC

PLC mainly undertakes the following functions in the control system:

(1) Receive external input signals, such as signals from buttons, sensors, and other devices.

(2) Execute preset program: Perform logical operations, sequence control, and other operations according to the preset program.

(3) Output control signal: Send control signals to actuators such as drivers based on the calculation results.

(4) Monitoring device status: Real time monitoring of device operation status by receiving feedback signals from the device.

(5) Fault handling: When the equipment malfunctions, issue an alarm signal and take corresponding measures.

Function of the driver

The driver mainly undertakes the following functions in the control system:

(1) Receive control signals: Receive control signals from controllers such as PLCs.

(2) Amplify power signal: Amplify the control signal into a power signal sufficient to drive the device to move.

(3) Drive equipment operation: Convert power signals into actual current or voltage to drive the equipment to move.

(4) Receive feedback signals: Receive feedback signals from devices and transmit them back to controllers such as PLCs to form closed-loop control.

4、 Collaboration between PLC and Drivers

In industrial automation control systems, the collaboration between PLC and drivers is mainly reflected in the following aspects:

Signal transmission and conversion

PLC sends control signals to the driver through output ports, which are usually digital or analog signals. After receiving these signals, the driver converts them into

electrical signals to drive the movement of the device. At the same time, the driver can also receive feedback signals from the device, convert them into digital or

analog signals, and then transmit them back to the PLC.

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: 9905-703 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).
9905-703 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-703Suitable 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.