Woodward 5501-003 |CPU Module, Origin: United States
1.5501-003 Product Overview
The Woodward 5501-003 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. 5501-003 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 5501-003 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.
Processing method:
a、 If possible, turn the position feedback polarity switch to another position. (Can be used on some drives)
b、 If using a speedometer, swap and connect TACH+and TACH – on the driver.
c、 If using an encoder, swap and connect ENC A and ENC B on the drive.
d、 In HALL speed mode, swap HALL-1 and HALL-3 on the drive, and then swap Motor-A and Motor-B together.
Reason for malfunction: During encoder speed feedback, the encoder power supply lost power.
Solution: Check the connection of the 5V encoder power supply. Ensure that the power supply can provide sufficient current.
If using an external power source, ensure that the voltage is connected to the driver signal ground.
4. The LED light is green, but the motor does not move.
Reason for malfunction: The motor in one or more directions is prohibited from operating.
Solution: Check the+INHIBIT and – INHIBIT ports.
Reason for malfunction: The command signal is not grounded to the driver signal.
5. After power on, the LED light of the driver does not light up.
Reason for malfunction: The power supply voltage is too low, below the minimum voltage requirement.
Solution: Check and increase the power supply voltage.
6. When the motor rotates, the LED light flashes.
Reason for malfunction: HALL phase error.
Solution: Check if the motor phase setting switch (60/120) is correct. Most brushless motors have a phase difference of 120.
Reason for malfunction: HALL sensor malfunction
Solution: When the motor rotates, detect the voltage of Hall A, Hall B, and Hall C. The voltage value should be between 5VDC and 0.
Solution: Connect the command signal ground to the driver signal ground.
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