8915-886 Woodward speed control module

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Product basic information
Manufacturer: Woodward
Model: 8915-886
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
8915-886 controller has stable performance and high reliability

Categories: WOODWARD
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8915-886 Woodward speed control module

The 8915-886 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 8915-886
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:
- 8915-886 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.

protection function

The gate driver chip needs to have protection functions such as overcurrent, overvoltage, and undervoltage to ensure the safe

operation of the device under abnormal conditions.

### 4. Design points of gate driver chip

When designing gate driver chips, the following key factors need to be considered:

####4.1 Driving Capability

The driving capability refers to the gate voltage and gate current that the gate driver chip can provide. When designing,

it is necessary to select appropriate driving capabilities based on the requirements of power electronic devices.

####4.2 Response speed

Response speed refers to the response time of the gate driver chip to changes in the input signal. When designing, it is necessary to optimize the circuit to achieve fast switch response.

####4.3 Protection Function

The protection function is an important feature of gate driver chips. When designing, it is necessary to consider various protective

measures such as overcurrent, overvoltage, undervoltage, etc., and ensure that they can take effect in a timely manner in case of abnormal situations.

####4.4 Electromagnetic compatibility

Electromagnetic compatibility refers to the normal working ability of gate driver chips in electromagnetic interference environments.

Measures need to be taken during design to reduce electromagnetic interference and improve the chip”s anti-interference ability.

####4.5 Thermal Design

The gate driver chip generates heat during operation. When designing, thermal design needs to be considered to ensure the stability and reliability of the chip under long-term operation.

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: 8915-886 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).
8915-886 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8915-886Suitable 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.