9905-144 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 9905-144
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
9905-144 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-144 controller debugger module Motor touch screen WOODWARD

9905-144 Woodward turbine controller

The 9905-144 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 9905-144
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:
- 9905-144 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.

4. Feedback compensation type semi closed loop control
This servo drive control compensation principle is the same as the open-loop compensation system, consisting of two independent

measurement systems consisting of a rotary transformer and an induction synchronizer,

both of which work in amplitude discrimination mode. The disadvantage of this system is high cost, requiring two sets of detection systems.

The advantage is that it is easier to adjust than a fully closed-loop system, has good stability, and is suitable for use as a feed drive for

high-precision large CNC machine tools.

Servo drive maintenance
1. When checking the current monitoring output terminal of the driver with an oscilloscope, it was found that it was all noise and could not be read out.

Fault cause: The current monitoring output terminal is not isolated from the AC power supply (transformer).

Solution: You can use a DC voltmeter to detect and observe.

2. The motor runs faster in one direction than in another.

Reason for malfunction: The phase of the brushless motor is incorrect.

Solution: Check or identify the correct phase.

Reason for malfunction: When not in use for testing, the test/deviation switch is turned to the testing position.

Solution: Turn the test/deviation switch to the deviation position.

Reason for malfunction: The position of the deviation potentiometer is incorrect.

Solution: Reset.

3. Motor stall.

Reason for malfunction: The polarity of the speed feedback is incorrect.

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: 9905-144 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).
9905-144 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-144Suitable 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.