Description
Technical Parameters
- Part Number: 5501-471
- Manufacturer: Woodward
- System Series: MicroNet / MicroNet TMR
- Module Type: Analog I/O (Input/Output)
- Input Channels: 24 Differential Analog Inputs
- Output Channels: 4 Differential Analog Outputs
- Resolution: 16-Bit A/D and D/A Converters
- Signal Range: 0–20 mA or 4–20 mA (Software configurable)
- Isolation: 500 Vrms galvanic isolation from logic to field
Product Description
The Woodward 5501-471 is a high-density Analog I/O module designed for use in Woodward’s MicroNet and MicroNet TMR (Triple Modular Redundant) control systems. It acts as the primary interface for processing continuous signals from turbine instrumentation and providing control signals to actuators.
This module is known for its high precision and fast update rates, which are essential for the stable governing of high-speed rotating machinery. Each input channel is differential, providing high common-mode rejection to minimize electrical noise interference. The module features integrated hardware self-testing to ensure that the data being sent to the CPU is accurate and reliable.
Application Areas
- Turbine Control: Monitoring temperature (via transducers), pressure, and flow rates for gas and steam turbines.
- Actuator Control: Providing 4–20 mA demand signals to fuel valves and steam extraction valves.
- Exhaust Gas Monitoring: Collecting thermocouple data from multiple points across a turbine exhaust frame.
- Load Management: Monitoring generator power output and bus voltage in power management systems.
Product Specifications
- Weight: 0.88 kg
- Dimensions: Standard MicroNet module footprint
- Update Rate: Typically 5 ms for all channels
- Accuracy: ±0.1% of full scale at 25°C
- Country of Origin: USA
Operating Precautions
- Shielding: To prevent signal jitter, ensure that all analog signal cables are shielded twisted pairs. The shield should be grounded only at one end (typically the MicroNet cabinet side) to avoid ground loops.
- Calibration: While the 5501-471 is factory-calibrated, it is recommended to perform a “loop check” during commissioning using a precision current source to verify the scaling in the Woodward GAP (Graphical Application Programmer) software.
- Termination Blocks: This module requires a matching Field Terminal Block (FTB). Ensure the FTB is securely fastened to the backplane to prevent intermittent signal loss.
- Redundancy Checks: In TMR systems, the I/O signals are voted. If a single channel on one module drifts beyond a specific tolerance compared to its redundant partners, the system will trigger an I/O fault alarm while maintaining control.
