9905-211 Woodward overspeed protector

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Product basic information
Manufacturer: Woodward
Model: 9905-211
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
9905-211 controller has stable performance and high reliability

Categories: WOODWARD
Tags: - Actuator 9905-211 controller debugger module Motor touch screen WOODWARD

9905-211 Woodward overspeed protector

The 9905-211 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 9905-211
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:
- 9905-211 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.

What are the parameters of stepper motor drivers? Common faults and maintenance of stepper motor drivers

What are the parameters of stepper motor drivers
The basic parameters of the stepper motor driver are as follows:

a、 The power supply can be selected according to the power specifications of the stepper motor being driven.

For AC power supply, such as AC80V, 220V mains power can be supplied to the driver through a step-down transformer.

When selecting a transformer, both voltage and current operating parameters must be considered simultaneously.

If the current value is 3A, the apparent power value obtained from the formula 80V × 3A=240VA cannot reach the actual output

capacity of 3A. The calculation result should be multiplied by a coefficient of 1.5 or more, and a transformer with 220/80V and 400VA or

more should be selected as the power input. The power supply of a two-phase motor is generally 12-48V,
b、 Output current value. The product labeling value is often the peak energy output capability. When selecting, the minimum should

be at least twice the rated current value of the stepper motor.

The gear of the output current is usually manually set by the dip switch on the control panel, such as 0.9A-3A. This is also an overload protection

setting, and the setting value can refer to the working current value of the stepper motor. Generally, there are 8 levels of grading.

c、 Excitation methods: full step, half step, 4-step, 8-step, 16-step, 32-step, 64 step. Half step is actually a 2-level subdivision, the higher the

subdivision level, the smaller the step torque angle, and the lower the motor speed. The control panel of the stepper driver is also equipped with a subdivision dip switch, and the subdivision values are also set.

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: 9905-211 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).
9905-211 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9905-211Suitable 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.