DS3800NSCA1G - Speed Current Regulator Auxiliary Board

DS3800NSCA1G - Speed Current Regulator Auxiliary Board DS3800NSCA1G - Speed Current Regulator Auxiliary Board

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Part No: DS3800NSCA1G
Manufacturer: General Electric
Product Type: Speed Current Regulator Auxiliary Board
Voltage Ranges: +/-25mV,
Operating Mode: Simplex
Series: Mark IV
Availability: In Stock
Current Range: +/-20mA
Dimensions: 7.14 × 4 × 1.5 in
Operating Temperature: 0 to 50°C
Country of Origin: USA


DS3800NSCA1G is a Speed Current Regulator Auxiliary Board manufactured and designed by General Electric and is part of the Mark IV Series used in GE Speedtronic gas turbine control systems. A speed Current Regulator Auxiliary Board is essential for precise and efficient management of the turbine's rotational speed and associated electrical parameters. Here’s an overview of its components, functionality, and application within a gas turbine control system:



  • Processes input signals and executes control algorithms.
  • Ensures real-time control and quick response to changing conditions.

Current Sensors:

  • Measure the electrical current in various parts of the turbine's electrical systems.
  • Typically Hall effect sensors or shunt resistors for accurate current measurement.

Speed Sensors:

  • Measure the rotational speed of the turbine.
  • Often optical encoders or magnetic sensors for high precision.

PWM Controller:

  • Regulates the voltage and current supplied to the turbine’s auxiliary systems.
  • Ensures precise control of electrical outputs affecting turbine operation.

Power Stage:

  • Includes high-power transistors (e.g., MOSFETs, IGBTs) for switching electrical loads.
  • Handles the substantial power requirements of the turbine’s auxiliary systems.

Feedback Loops:

  • Utilize PID (Proportional-Integral-Derivative) controllers to maintain desired speed and current levels.
  • Provide stable and accurate control by continuously adjusting to feedback signals.

Protection Circuits:

  • Protect the turbine and control system from overcurrent, overvoltage, and thermal issues.
  • Includes fuses, thermal cutoffs, and transient voltage suppression diodes.

Communication Interfaces:

  • Facilitate communication between the auxiliary board and the main turbine control unit.
  • Common interfaces include CAN bus, Modbus, and Ethernet.


Speed Regulation:

  • Continuously monitors and adjusts the turbine’s rotational speed to maintain optimal performance.
  • Uses feedback from speed sensors to ensure precise control, especially during load changes.

Current Regulation:

  • Manages the electrical current in the turbine’s auxiliary systems.
  • Ensures that current levels are within safe limits to protect components and maintain efficiency.

Efficiency Optimization:

  • Adjusts operational parameters to optimize the turbine’s efficiency.
  • Implements advanced algorithms to minimize energy consumption and maximize output.

Protection Mechanisms:

  • Monitors for fault conditions like overcurrent, overheating, and electrical short circuits.
  • Automatically triggers protective measures to prevent damage to the turbine and control systems.

Diagnostics and Monitoring:

  • Provides real-time data on turbine performance, including speed, current, and fault conditions.
  • Enables predictive maintenance and quick troubleshooting through detailed diagnostics.


Speed Control:

  • Essential for maintaining the turbine’s operating speed within precise limits.
  • Critical during startup, shutdown, and load transitions to ensure smooth and stable operation.

Power Management:

  • Regulates the power supplied to auxiliary systems, such as lubrication pumps and cooling systems.
  • Ensures that these systems operate efficiently and do not interfere with the turbine’s primary functions.

Load Balancing:

  • Distributes electrical loads evenly to prevent overloading any single component.
  • Helps maintain the overall stability and reliability of the turbine’s electrical systems.

Safety and Reliability:

  • Implements multiple layers of protection to safeguard against potential faults.
  • Enhances the reliability of the gas turbine by ensuring all systems operate within safe parameters.

WOC has the largest stock of replacement parts for GE Speedtronic Gas turbine control systems. We can also repair your faulty boards and supply unused and rebuilt boards backed up with a warranty. Our team of experts is available round the clock to support your OEM needs. Our team of experts at WOC is happy to assist you with any of your automation requirements. For pricing and availability on parts and repairs, kindly contact our team by phone or email.


What is a Speed Current Regulator Auxiliary Board?

A Speed Current Regulator Auxiliary Board is an electronic component that precisely controls the speed and current of electric motors or turbines. It ensures efficient operation, protection, and performance optimization in various applications.

How does the board regulate motor speed?

The board uses feedback from speed sensors and adjusts the voltage and current supplied to the motor through PWM control. It employs PID controllers to ensure the motor runs at the desired speed, adjusting continuously based on real-time feedback.

What kind of diagnostics and monitoring does the board provide?

The board offers real-time data on system performance, including speed, current, and fault conditions. This data helps in predictive maintenance and troubleshooting, ensuring the system operates smoothly and efficiently.