Woodward 9905-391 from SAUL ELECTRIC | In Stock
1.9905-391 Product Overview
The Woodward 9905-391 belongs to the 505/505E series digital turbine controllers. It is a microprocessor-based control module designed for single-valve steam turbines,
including single extraction/admission systems or split-range actuator configurations.
The controller features a front panel Operator Control Panel (OCP) with a two-line, 24-character display and multi-function keypad, allowing easy on-site configuration and monitoring.
2. 9905-391 Technical Specifications and Parameters
| Parameter | Details |
|---|---|
| Power Supply | +24 VDC, approx. 1 A |
| I/O Outputs | Discrete Outputs: 8 Analog Outputs: 6 Actuator Outputs: 2 |
| Display / HMI | Two-line, 24-character LCD, with multi-function keypad |
| Dimensions | Approx. 14 × 11 × 4 in (35.6 × 27.9 × 10.2 cm) |
| Weight | Approx. 9.11 lbs (4.13 kg) |
| Operating Temperature | –4 to +140 °F (–20 to +60 °C) |
| Storage Temperature | –40 to +185 °F (–40 to +85 °C) |
| Humidity Standard | 95% RH at 20-55 °C for 48 hours without damage |
| Protection Class | Typically meets industrial dust and water protection standards |
| Communication Protocol | Supports Modbus, RS-232 / RS-422 serial interfaces |
3. Brand History
Woodward, Inc., founded in 1870 and headquartered in Fort Collins, Colorado, USA, is a global leader in energy control systems. The company has a long history of innovation in turbine control, engine management,
and power generation systems.
Woodward products are widely recognized for their reliability and precision in demanding industrial and power generation applications.
4. Applications in Industrial Automation
The 9905-391 plays a critical role in industrial automation and power generation environments:
- Steam Turbine Control: Manages startup, speed regulation, and extraction/admission control of steam turbines.
- Power Generation Systems: Used in power plants to regulate turbine-driven generators for stable frequency and load management.
- Compressor and Pump Drive Control: Ensures precise speed control for turbine-driven compressors and pumps.
- Process Industry Applications: Applied in chemical plants, refineries, and other industries requiring precise turbine operation.
- Safety and Protection Functions: Includes overspeed protection, critical speed avoidance, actuator travel limits, and event logging for operational safety.
What is the principle of gate driver chip
What is the principle of gate driver chip
Gate driver chip is an integrated circuit used to control the gate voltage of power electronic devices such as IGBT, MOSFET, etc.
It has important applications in the field of power electronics, such as motor drives, switching power supplies, solar inverters, etc.
This article will provide a detailed introduction to the principle, structure, functions, and design points of gate driver chips.
### 1. Basic principle of gate driver chip
The main task of the gate driver chip is to provide appropriate voltage and current to the gate of power electronic devices to achieve
fast switching and stable operation of the devices. The basic principle is as follows:
####1.1 Gate voltage control
The gate voltage of power electronic devices needs to vary within a certain range to achieve conduction and cutoff of the device.
The gate driver chip generates an appropriate gate voltage by adjusting the input signal, thereby controlling the switching state of the device.
####1.2 Gate current control
The gate driver chip also needs to provide sufficient gate current to ensure fast switching of the device. This is usually achieved through an internal current amplification circuit.
####1.3 Protection Function
Gate driver chips typically have protection functions such as overcurrent, overvoltage, and undervoltage to ensure the safe operation of the device under abnormal conditions.
### 2. Structure of Gate Driver Chip
The gate driver chip usually consists of the following parts:
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