8915-118 WOODWARD Debugger unit

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Product basic information
Manufacturer: Woodward
Model: 8915-118
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
8915-118 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 8915-118 controller debugger module Motor touch screen WOODWARD

8915-118 WOODWARD Debugger unit

The 8915-118 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 8915-118
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:
- 8915-118 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.

The microcontroller used here is designed specifically for the convenience of daily life. It is a microcontroller developed by Parallax called “BASIC Stamp”. BASIC Stamp

is a PIC microcontroller compatible with the BASIC programming language. The use of BASIC programming language makes software writing for microcontrollers very easy.

The microcontroller comes with a 9-volt battery powered motherboard that can be programmed by connecting it to a port on the computer. No manufacturer will use

BASIC Stamps in their actual products – because Stamps are expensive and relatively slow. However, using Stamps for experimental modeling or one-time product demonstrations is very common because its setup and use are incredibly easy.

The microcontroller is called “Stamps” because it is only the size of a postage stamp.

Parallax has produced two versions of BASIC Stamp: BS-1 and BS-2. Here is a comparison of two versions:

Compare project BS-1BS-2

Random Access Memory 14 bytes 26 bytes

Electric erasable read-only memory 256 bytes 2000 bytes

The maximum program length is about 75 instructions and about 600 instructions

Execution speed of 2000 lines per second and 4000 lines per second

Input/output pin 816

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: 8915-118 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).
8915-118 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8915-118Suitable 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.