9904-254 Woodward ProTech 203

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Product basic information
Manufacturer: Woodward
Model: 9904-254
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
9904-254 controller has stable performance and high reliability

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9904-254 Woodward ProTech 203

The 9904-254 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 9904-254
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:
- 9904-254 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.

Driver/receiver, what is the principle of driver/receiver?

5V dual RS232 driver/receiver

The T1780/LT1781 dual RS driver/receiver has a single 5V power supply, low power consumption (only 40mW),

and ± 15kV ESD protection (no expensive TransZorbs are required at the RS232 terminal). Only a 0.1 μ F external capacitor is needed to operate

at 120k Baud (for load RL=3K, CL=2500pF) and 250kBaud (for load RL=3, CL=1000pF). LT1780/LT1781 is completely consistent with the EIA RS232

standard. Its output can withstand ± 30V without damage. The output of its driver and receiver is in a high impedance state under shutdown or power-off

conditions. The applications of LT1780/LT1781 include portable computers, battery powered systems, power generators, terminals, modems,

etc. Its typical application circuit is shown in Figure 1.

The T1780/LT1781 dual RS driver/receiver has a single 5V power supply, low power consumption (only 40mW), and ± 15kV ESD protection

(no expensive TransZorbs are required at the RS232 terminal). Only 0.1 μ F external capacitor is needed to operate at 120k

Baud (for load RL=3K, CL=2500pF), 250kBaud (for load RL=3, CL=1000pF).

LT1780/LT1781 and EIA

The RS232 standard is completely consistent. Its output can withstand ± 30V without damage. The output of its driver and receiver is in a high impedance state

under shutdown or power-off conditions. The applications of LT1780/LT1781 include portable computers, battery powered systems, power generators, terminals, modems, etc.

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: 9904-254 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).
9904-254 Weight: Approximately 9.11 pounds (4.13 kilograms).

IV. Application Scenarios

Steam Turbine Control: 9904-254Suitable 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.