Woodward 9700-1200 |CPU Module, Origin: United States
1.9700-1200 Product Overview
The Woodward 9700-1200 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. 9700-1200 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 9700-1200 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.
key parameters
Driving voltage: The gate voltage of MOSFETs and IGBTs is usually between 10V and 15V, but the output voltage of the gate driver should
be greater than this range to ensure reliable conduction and cutoff of the device. The output voltage range of gate drivers is usually determined
based on specific applications and device requirements.
Drive current: In order to charge and discharge the gate capacitance of MOSFETs and IGBTs, the gate driver needs to provide sufficient current.
These current values typically range from a few hundred milliamps to a few amperes, depending on the size of the device”s gate capacitance and
switching speed requirements.
Drive speed: The gate voltage of MOSFETs and IGBTs changes rapidly, so the gate driver must be able to quickly charge and discharge the gates
of these devices. The speed of driving directly affects the switching speed and efficiency of the device.
Anti interference capability: In the application environment of power electronics, there are various electromagnetic interferences and noises.
The gate driver must have a certain anti-interference ability to ensure the reliability and stability of the signal.
Main components
The gate driver mainly consists of the following parts:
Power supply: usually composed of a DC/DC converter and a capacitor. DC/DC converters convert input voltage into output voltage suitable for
gate drivers (typically between 15V and 30V), while capacitors are used to store charge for fast charging and discharging of MOSFET and IGBT gates when needed.
Amplifier: The core component of a gate driver that converts input signals into drive signals suitable for MOSFET and IGBT gates. An amplifier
typically consists of transistors, operational amplifiers, and inverters/non inverters, used to amplify input signals and control the current of transistors.
Protection circuit: used to protect MOSFETs and IGBTs from damage. Protection circuits typically include functions such as undervoltage protection,
overvoltage protection, overcurrent protection, and transient voltage protection to prevent device damage caused by abnormal power supply voltage or excessive output current.
Output circuit: Convert the output current of the amplifier into driving signals suitable for MOSFETs and IGBTs. The output circuit typically consists of a
driving transformer and an output capacitor, used to convert the driving signal into a voltage suitable for the gate and store charge.
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