8915-887 Woodward Ship Spare Parts

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Product basic information
Manufacturer: Woodward
Model: 8915-887
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
8915-887 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 8915-887 controller debugger module Motor touch screen WOODWARD

8915-887 Woodward Ship Spare Parts

The 8915-887 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 8915-887
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:
- 8915-887 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 the principle of gate driver chip

What is the principle of gate driver chip
Gate driver chip is an integrated circuit used to control the gate voltage of power electronic devices such as IGBT, MOSFET, etc.

It has important applications in the field of power electronics, such as motor drives, switching power supplies, solar inverters, etc.

This article will provide a detailed introduction to the principle, structure, functions, and design points of gate driver chips.

### 1. Basic principle of gate driver chip

The main task of the gate driver chip is to provide appropriate voltage and current to the gate of power electronic devices to achieve

fast switching and stable operation of the devices. The basic principle is as follows:

####1.1 Gate voltage control

The gate voltage of power electronic devices needs to vary within a certain range to achieve conduction and cutoff of the device.

The gate driver chip generates an appropriate gate voltage by adjusting the input signal, thereby controlling the switching state of the device.

####1.2 Gate current control

The gate driver chip also needs to provide sufficient gate current to ensure fast switching of the device. This is usually achieved through an internal current amplification circuit.

####1.3 Protection Function

Gate driver chips typically have protection functions such as overcurrent, overvoltage, and undervoltage to ensure the safe operation of the device under abnormal conditions.

### 2. Structure of Gate Driver Chip

The gate driver chip usually consists of the following parts:

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: 8915-887 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).
8915-887 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8915-887Suitable 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.