Woodward 9907-028 |CPU Module, Origin: United States
1.9907-028 Product Overview
The Woodward 9907-028 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. 9907-028 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 9907-028 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.
How to repair servo drives _ Servo drive repair tips
Characteristics of servo drives
1. The servo drive software program mainly includes the main program, interrupt service program, and data exchange program.
2. The main program of the servo driver is mainly used to complete system initialization, LO interface control signals, and register settings for various control modules within the DSP.
3. After all initialization work of the servo drive is completed, the main program enters a waiting state and waits for the occurrence of interrupts in order to adjust the current loop and speed loop.
4. After all initialization work of the servo drive is completed, the main program enters a waiting state and waits for the occurrence of interrupts in order to adjust the current loop and speed loop.
5. The initialization of servo drivers mainly includes the initialization of DsP cores, setting of current and speed loop cycles, PWM initialization,
4M startup, ADc initialization and startup, QEP initialization, initialization of vector and permanent magnet synchronous motor rotor initial positions,
multiple sampling of servo motor phase currents, determination of zero offset of phase currents, initialization of current and speed P regulation, etc.
6. PWM timing interrupt programs are used to sample and calibrate the two-phase currents ia and ib of Hall current sensors A and B, as well
as calculate the rotor magnetic field orientation angle based on the principle of magnetic field orientation control, and generate PWM signals to control the position and velocity loops.
7. The power drive protection interrupt program is mainly used to detect the fault output of intelligent power modules.
8. The zero pulse capture interrupt program of the photoelectric encoder can accurately capture the feedback zero pulse of the encoder, thereby obtaining the
correction value of the vector transformation orientation angle of the AC permanent magnet synchronous motor.
9. The data exchange program mainly includes communication programs with the upper computer, reading of EEPRoM parameters, digital display programs, etc.
Storage controller keyboard values for parameters.
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