The Westinghouse 7379A31 (Model GO7QAW) is a high-precision Analog I/O card designed for the Westinghouse Distributed Control System (WDPF) and legacy Ovation platforms, facilitating the interface between process transmitters and the central controller.
Product Parameters (Datasheet)
- Model Number: 7379A31
- Part ID: GO7QAW
- Firmware/Hardware Revision: P1.5
- Card Type: Analog Input/Output Module
- Input Signal Range: 4-20 mA DC / 1-5 V DC (Configurable)
- Output Signal Range: 4-20 mA DC
- Resolution: 12-bit or 14-bit Analog-to-Digital conversion (model dependent)
- Channel Density: Typically 8 channels per card
- System Compatibility: Westinghouse WDPF II / Ovation DCS
- Isolation: Optical and galvanic isolation per channel to prevent ground loops
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
Country of Origin
This Analog I/O card was engineered and manufactured by Westinghouse Electric Corporation (later Emerson Process Management/Ovation) in the USA.
Application Fields
The 7379A31 GO7QAW is a critical component in the following industrial sectors:
- Power Generation: Monitoring steam pressure, turbine temperature, and water levels in boiler control loops.
- Water Treatment: Managing flow rates and chemical dosing levels in municipal facilities.
- Chemical Plants: Precise control of liquid levels and temperature in reactor vessels.
- Metals & Mining: Interfacing with sensors on conveyor systems and furnace temperature controllers.
Product Usage Instructions
- Preparation: Before installation, verify that the jumpers or DIP switches are set correctly for the desired signal type (e.g., 4-20mA vs 1-5V).
- Installation: Insert the card into the designated slot of the WDPF/Ovation rack. Ensure the card is aligned with the guide rails and the rear connector is fully seated.
- Wiring: Connect the field instrument cables to the corresponding termination block. Ensure shielded cables are grounded at the rack end to minimize signal noise.
- Configuration: Update the DCS database to recognize the new I/O point. Calibrate the zero and span settings via the system’s software console.
- Monitoring: Use the onboard diagnostic LEDs to verify the “Active” status. A steady “Run” light indicates the card is communicating correctly with the data highway.
Product Technical Description
The 7379A31 GO7QAW P1.5 serves as a high-density signal conditioner. Technically, it converts analog signals from field transmitters into digital data for the controller’s processor. The P1.5 revision includes hardware enhancements designed to improve thermal stability and signal-to-noise ratios, which is essential for maintaining accuracy in high-EMI environments like power plant control rooms. The card features independent signal paths, ensuring that a failure on one channel does not impact the functionality of the remaining I/O points.
Q&A (Common Questions)
Q: Can this card be used with RTD or Thermocouple sensors directly? A: No, the 7379A31 is designed for high-level analog signals (4-20mA/1-5V). For temperature sensors, a dedicated RTD/TC card or an external transmitter is required.
Q: What is the difference between revision P1.5 and earlier versions? A: Revision P1.5 typically indicates a hardware refresh with updated capacitors and resistors for better longevity and faster sampling rates.
Q: Why is my analog signal showing “Under Range”? A: This often indicates a break in the field wiring (open loop) or a failed transmitter. Check the loop voltage at the termination block.
Q: Is this card hot-swappable? A: While many WDPF/Ovation cards support live insertion, it is highly recommended to follow the system-specific “Hot Swap” procedure to avoid disrupting the data highway.
Similar Model Recommendations
- Westinghouse 7379A32 (Updated Analog Variant)
- Westinghouse 1C31116G01 (Ovation Analog Input)
- Westinghouse 7379A71 (Digital I/O companion)
- Westinghouse 1C31122G01 (Analog Output Module)
- Westinghouse 7379A21 (Processor Interface Card)
For technical support or to request a quote for the Westinghouse 7379A31, please contact our automation parts team.
