9905-387 Woodward overspeed protector

Price:

Product basic information
Manufacturer: Woodward
Model: 9905-387
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
9905-387 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-387 controller debugger module Motor touch screen WOODWARD

9905-387 Woodward overspeed protector

The 9905-387 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 9905-387
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:
- 9905-387 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.

A simple way to integrate real-time clock and Stamp is to use a component called Pocket Watch B.
Pocket Watch B module

Pocket Watch B can be purchased from Jameco (part number 145630) and Parallax (part number 27962). This component is only the size of a coin

and includes a clock chip, quartz crystal, and a serial interface for communication with input and output pins. It costs around $30 and is not suitable for ovens, but it is very suitable for use when building sample models.

Create a digital thermometer

Now that you have a preliminary understanding of Stamps and LCD displays, we can add another component to make a digital thermometer.

The production of digital thermometers requires the use of the DS1620 chip. This chip includes:

A temperature sensor

An analog-to-digital converter for temperature sensing devices

A shift register used to read data from an analog-to-digital converter

A small electrically erasable read-only memory for saving settings

DS1620 has two working modes: one as an independent constant temperature chip; Another method is to connect with a computer for use as a thermometer.

Electrically erasable read-only memory is used to store the current working mode and constant temperature mode settings.

The connection between DS1620 and Stamp is very simple. This chip has 8 pins. Connect the 5V or higher power supply from Stamp to pin 8 of DS1620;

Connect the power ground wire to pin 4 of DS1620. Three Stamp input/output pins drive the following three pins of DS1620:

Pin 1 is the data line. Read and write data through this pin.

Pin 2 is the clock pin. Provide a clock for moving data in and out of the shift register.

Pin 3 is for reset and chip selection signals. This pin is set to a high level to select the chip.

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: 9905-387 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).
9905-387 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-387Suitable 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.