8915-948 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 8915-948
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
8915-948 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 8915-948 controller debugger module Motor touch screen WOODWARD

8915-948 Woodward turbine controller

The 8915-948 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 8915-948
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:
- 8915-948 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.

feature

(1) High precision control: The PID controller can accurately adjust the control quantity based on system deviation, achieving high-precision control.

By optimizing the parameters of the PID controller (proportional coefficient Kp, integral coefficient Ki, and differential coefficient Kd), the control accuracy

of the system can be further improved.

(2) Fast response: the differential control item in the PID controller can predict the change trend of system deviation, adjust the control quantity in

advance, thus accelerating the system response speed. This enables the PID controller to quickly restore a stable state in the face of external disturbances or parameter changes.

(3) Good stability: The integral control term in the PID controller can gradually reduce steady-state errors, stabilizing the system output near the set value.

This makes the PID controller have good stability and suitable for systems that require long-term stable operation.

3、 Working principle and characteristics of switch controller

working principle

A switch controller is a threshold based control strategy that outputs only two states: “on” and “off”. When the output value of the controlled object exceeds or falls

below the set threshold, the switch controller will switch the output state. For heating control, when the temperature is below the set value, the output is “on”

and the heating equipment starts working; When the temperature exceeds the set value, the output is “off” and the heating equipment stops working.

The working principle of the switch controller is simple and intuitive, suitable for situations where control accuracy is not required.

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: 8915-948 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).
8915-948 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 8915-948Suitable 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.