DS200TCCAG1ACA - Analog I/O Board

SPECIFICATIONS

Part Number: DS200TCCAG1ACA
Manufacturer: General Electric
Country of Manufacture: United States (USA)
Series: Mark V
Function: Analog I/O Board

Functional Description

DS200TCCAG1ACA is an analog I/O board developed by GE. It is part of the GE Speedtronic Mark V control system. The board handles a variety of analog signals. It processes 4-20 mA inputs and outputs, which are commonly used for transmitting analog signals over long distances with high noise immunity. Additionally, it manages RTD (Resistance Temperature Detector) inputs for precise temperature measurements, thermocouple inputs for temperature sensing based on voltage differences, shaft voltage inputs for monitoring voltage on rotating shafts, and shaft current inputs to detect electrical currents flowing through rotating shafts.

Hardware

• J1 (Serial Port Enable/Disable): This jumper is used to enable or disable the serial RS232 port on the TCCA board. The RS232 port is often used for serial communication, and configuring this jumper allows users to control whether the port is active or inactive based on their needs.
• JP2 (Oscillator Disable for Card Test): This jumper is used to disable the oscillator on the TCCA board for card testing purposes. Disabling the oscillator can be useful during diagnostic or troubleshooting activities to ensure that test conditions do not interfere with normal board operation.
• JP3 (Factory Test): This jumper is reserved for factory testing. It is used during the manufacturing or calibration process to perform specialized tests that ensure the board meets its design specifications and operates correctly.

Software

• Thermocouples: Settings for temperature measurements using thermocouples.
• RTDs (Resistance Temperature Detectors): Configuration for precise temperature readings from RTDs.
• Milliamp Inputs and Outputs: Parameters for analog signal inputs and outputs in the 4–20 mA range.
• Shaft Voltage and Current: Configuration settings for monitoring shaft voltage and current.

4-20 mA Input Circuit

• Signal Acquisition: The board reads 4-20 mA input signals from the CTBA terminal board via the JBB connector.
• Current Measurement: The transducer current is passed through a burden resistor on the board. The purpose of the burden resistor is to convert the current signal into a voltage drop.
• Voltage Reading: The voltage drop across the burden resistor is measured by the board. This measurement represents the analog signal corresponding to the original 4–20 mA current.
• Data Transmission: The board then writes the processed voltage drop data to the I/O through the 3PL connector. This ensures that the analog signals are integrated into the control system for monitoring and control purposes. 

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FREQUENTLY ASKED QUESTIONS

What is DS200TCCAG1ACA?
It is an analog I/O board and is part of the GE Speedtronic Mark V gas turbine control system.

What happens to the signals after they are received by the board?
Once the board receives the signals via the JBB connector, it scales and conditions them. This processing ensures the signals are in the correct format for further handling and analysis.

How are the conditioned signals sent to the I/O?
The conditioned shaft voltage and current signals are transmitted to the I/O engine through the 3PL connector. This connector facilitates the communication of processed data from the board to the I/O engine, integrating the signals into the broader control system.

Why is monitoring shaft voltage and current important?
Monitoring shaft voltage and current is crucial for detecting electrical anomalies that could affect the turbine's performance and safety. Early detection of such issues helps prevent potential damage and ensures the turbine operates reliably and efficiently.