31902-02 Woodward turbine controller

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Product basic information
Manufacturer: Woodward
Model: 31902-02
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
31902-02 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 31902-02 controller debugger module Motor touch screen WOODWARD

31902-02 Woodward turbine controller

The 31902-02 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 31902-02
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:
- 31902-02 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.

2、 Variable frequency speed regulation: Advantages: ① No additional slip loss, high efficiency, wide speed regulation range; ②

For situations where low load operation time is long, or where starting and stopping are frequent, the purpose of energy saving and motor protection can be achieved. Disadvantages: The technology is complex and the price is high.

3、 Inverter motor speed regulation: Advantages: ① It has a simple structure for AC synchronous motors and good speed regulation performance for

DC motors; ② When operating at low speeds, use power supply voltage, and when operating at high speeds, use stepper motor back electromotive force for

natural commutation, ensuring reliable operation; ③ No additional slip loss, high efficiency, suitable for starting and speed regulation of high-speed and large capacity synchronous motors.

Disadvantages: Low overload capacity, and the capacity of the original motor cannot be fully utilized.

4、 Cascade speed regulation: Advantages: ① It can feedback and utilize the slip energy generated during the speed regulation process. efficient; ② The device capacity is proportional to the speed regulation range and is suitable for 70% to 95% speed regulation. Disadvantages: Low power factor, harmonic interference, no braking torque during normal operation, suitable for loads operating in a single quadrant.

5、 Stator voltage and speed regulation: Advantages: ① Simple circuit, small device size, and low price; ② Easy to use and maintain. Disadvantages: ① Increased slip loss

during speed regulation, which causes the rotor to heat up and has lower efficiency; ② The speed regulation range is relatively small; ③ Require the use of high slip motors, such as specially

designed torque motors, which have softer characteristics and are generally suitable for asynchronous motors below 55kW.

6、 Electromagnetic differential clutch speed regulation: Advantages: ① Simple structure, small control device capacity, and low value; ② Reliable operation and easy maintenance;

③ No harmonic interference. Disadvantages: ① Large speed loss, because the electromagnetic slip clutch itself has a large slip, so the maximum speed of the output shaft is only 80% to 90% of the synchronous speed of the motor;

② During the speed regulation process, all the differential power is converted into thermal energy, resulting in low efficiency.

7、 Rotor series resistance speed regulation: Advantages: ① Low technical requirements, easy to master; ② Low equipment costs; ③ No electromagnetic harmonic interference. Disadvantages:

① The series cast iron resistor can only be adjusted in stages. If liquid resistors are used for stepless speed regulation, higher maintenance and upkeep requirements will be required;

② The additional slip power during the speed regulation process is all converted into losses in the form of heat generated by the series resistor, resulting in low efficiency. ③ The speed range is not large.

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: 31902-02 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).
31902-02 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 31902-02Suitable 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.