9905-204 Woodward overspeed protector

Price:

Product basic information
Manufacturer: Woodward
Model: 9905-204
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
9905-204 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-204 controller debugger module Motor touch screen WOODWARD

9905-204 Woodward overspeed protector

The 9905-204 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 9905-204
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:
- 9905-204 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.

How to repair servo drives _ Servo drive repair tips

Characteristics of servo drives
1. The servo drive software program mainly includes the main program, interrupt service program, and data exchange program.

2. The main program of the servo driver is mainly used to complete system initialization, LO interface control signals, and register settings for various control modules within the DSP.
3. After all initialization work of the servo drive is completed, the main program enters a waiting state and waits for the occurrence of interrupts in order to adjust the current loop and speed loop.

4. After all initialization work of the servo drive is completed, the main program enters a waiting state and waits for the occurrence of interrupts in order to adjust the current loop and speed loop.

5. The initialization of servo drivers mainly includes the initialization of DsP cores, setting of current and speed loop cycles, PWM initialization, 4M startup, ADc initialization and startup,

QEP initialization, initialization of vector and permanent magnet synchronous motor rotor initial positions, multiple sampling of servo motor phase currents, determination of zero

offset of phase currents, initialization of current and speed P regulation, etc.

6. PWM timing interrupt programs are used to sample and calibrate the two-phase currents ia and ib of Hall current sensors A and B, as well as calculate the rotor magnetic field

orientation angle based on the principle of magnetic field orientation control, and generate PWM signals to control the position and velocity loops.

7. The power drive protection interrupt program is mainly used to detect the fault output of intelligent power modules.

8. The zero pulse capture interrupt program of the photoelectric encoder can accurately capture the feedback zero pulse of the encoder, thereby obtaining the correction value

of the vector transformation orientation angle of the AC permanent magnet synchronous motor.

9. The data exchange program mainly includes communication programs with the upper computer, reading of EEPRoM parameters, digital display programs, etc. Storage controller keyboard values for parameters.

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: 9905-204 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).
9905-204 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-204Suitable 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.