DS3800HLEA | GE Mark V LVDT/RVDT Output Module

Description

Product Introduction

The DS3800HLEA is the dedicated LVDT/RVDT output board for the Mark V—it provides the excitation signals for LVDT and RVDT position sensors used on turbine valves and actuators. This board generates the 120V AC excitation voltage and conditions the output signals to drive the sensors. The HLEA is used in conjunction with LVDT input boards (like the HLCA or HLCB) to complete the position feedback loop for valve position control.

We’ve used the HLEA in turbine control applications where valve position feedback is required. The board’s excitation output provided stable 120V AC signals for the LVDT sensors, enabling accurate position feedback for the fuel control valves.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the difference between the HLEA and an LVDT input board like the HLCA?
A: The HLEA is an output board that generates the excitation signals for the LVDT sensors. The HLCA is an input board that processes the return signals from the sensors. The HLEA provides the excitation voltage, and the HLCA conditions the secondary voltages to provide position feedback. Both boards are needed for a complete LVDT position feedback system.

Q: What type of LVDT sensors does the HLEA support?
A: The HLEA supports standard 120V AC-excited LVDT and RVDT sensors used in turbine control applications. The board provides the 120V AC excitation at 50/60Hz, which is compatible with most industrial LVDT sensors.

Q: Does the HLEA provide stable excitation voltage?
A: Yes, the HLEA provides stable 120V AC excitation voltage for the LVDT sensors. The excitation frequency is 50/60Hz, depending on the system configuration. The board uses precision signal generation circuitry to ensure stable and accurate excitation.

Q: What’s the backplane current draw of the HLEA?
A: The HLEA draws approximately 1.2A from the 5V backplane rail. The Mark V power supply is rated at 6A on the 5V rail, so the HLEA is within the limit. If your rack has multiple HLEA boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin.

Q: Does the HLEA have conformal coating?
A: Not by default. The HLEA’s suffix typically indicates termination type, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HLEA1G1G). The standard HLEA is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

Q: Can I use the HLEA with LVDT sensors from different manufacturers?
A: The HLEA is designed for standard 120V AC-excited LVDT sensors. Most industrial LVDT sensors from major manufacturers (e.g., Schaevitz, Solartron) are compatible. However, always verify the sensor’s excitation requirements and output characteristics before installation. Consult the sensor data sheet and compare with the HLEA specifications.

Q: What’s the difference between the HLEA and the HLEB?
A: The HLEB is an upgraded version of the HLEA that includes additional diagnostic features, such as excitation voltage monitoring and output current sensing. The HLEA is the standard output board, while the HLEB provides enhanced monitoring capabilities for critical applications. Check the specific configuration for details.

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