Woodward 9907-175 |CPU Module, Origin: United States
1.9907-175 Product Overview
Woodward controller speed controller
The Woodward 9907-175 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. 9907-175 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 9907-175 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.
The difference between BLDC driver and servo motor driver
BLDC drivers and servo motor drivers are two different types of motor drivers, and there are some differences in their working principles,
application scenarios, and performance characteristics.
1. Working principle:
-BLDC driver (brushless DC motor driver): The BLDC driver drives the brushless DC motor through an electronic commutator. Based on the
feedback of the motor rotor position and speed, it uses electronic means to control the commutation in real time, thereby ensuring the smooth operation of the motor.
-Servo motor driver: The servo motor driver performs closed-loop control with the controller through position, speed, or torque feedback signals to achieve precise position and speed control.
2. Application scenarios:
-BLDC driver: suitable for applications that require high efficiency, low noise, long lifespan, and a high speed range, such as electric vehicles, drones, robots, etc.
-Servo motor driver: suitable for applications that require high-precision position and speed control, such as CNC machine tools, automation
equipment, precision instruments, etc.
3. Control mode:
-BLDC driver: usually adopts open-loop control, which directly drives the brushless DC motor to rotate according to the preset control signal.
-Servo motor driver: Adopting closed-loop control, it compares the actual position, speed, or torque with the target value by cooperating with feedback
devices (such as encoders), and feeds back control signals based on the difference to make the motor motion more accurate and stable.
4. Performance characteristics:
-BLDC driver: It has the characteristics of high efficiency, high torque density, strong reliability, and wide adaptability, but usually requires relatively low control accuracy.
-Servo motor driver: It has the characteristics of high precision, high dynamic performance, and good position control stability, but it is relatively complex and costly.
It should be noted that there may be some cross application between BLDC drivers and servo motor drivers, and the appropriate driver
type should be selected based on specific application and technical requirements.
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