DS3800HLCA1C1D | GE Mark V LVDT/RVDT Input Module

Description

Product Introduction

The DS3800HLCA1C1D is the dedicated LVDT/RVDT input board in the 1C1D configuration—locking spring-cage terminals with 1A fusing on Bank 1 and 2.5A fusing on Bank 2. This board processes position feedback signals from LVDT and RVDT sensors, providing the 120V AC excitation and conditioning the return signals for accurate position feedback. The locking terminals ensure reliable connections in high-vibration environments, and the mixed fusing allows you to match protection to different sensor requirements—1A for standard LVDT connections and 2.5A for sensors with longer cable runs or higher current requirements.

We’ve used the HLCA1C1D in a gas turbine application where valve position feedback was critical for fuel control. The locking terminals prevented intermittent connections from the LVDT sensors, and the 2.5A bank handled the long cable runs to the valves on the turbine casing. The 1A bank was used for the sensors in the control room. The board provided accurate position feedback with ±0.1% accuracy, enabling precise fuel control.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the locking terminals on the 1C suffix?
A: The locking terminals have a plastic latch that prevents the wire from pulling out under vibration. This is particularly important for LVDT position sensors, where intermittent connections can cause position feedback errors or valve position drift. The locking mechanism is a simple but effective solution for high-vibration environments.

Q: Why does the HLCA1C1D have mixed fusing (1A and 2.5A)?
A: The mixed fusing allows you to match protection to different sensor requirements. The 1A bank is for standard LVDT connections with moderate cable runs. The 2.5A bank is for sensors with longer cable runs or higher current requirements. The LVDT sensors themselves draw minimal current, but the cable capacitance can cause inrush currents on power-up.

Q: What type of LVDT sensors does the HLCA1C1D support?
A: The HLCA1C1D supports standard 120V AC-excited LVDT and RVDT sensors used in turbine control applications. The board provides the 120V AC excitation and conditions the secondary voltages to provide a position feedback signal. The board’s input impedance (10kΩ) is compatible with most industrial LVDT sensors.

Q: What’s the accuracy of the position measurement on the HLCA1C1D?
A: The HLCA1C1D provides position measurement with an accuracy of ±0.1% of full scale. This is sufficient for most turbine valve position control applications. The board uses precision signal conditioning circuitry to ensure accurate position feedback.

Q: Does the HLCA1C1D have conformal coating?
A: Not by default. The 1C1D suffix indicates locking terminals and mixed fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HLCA1G1D). The standard HLCA1C1D is suitable for indoor environments. If your plant has high humidity or corrosive conditions, consider a coated variant.

Q: What’s the backplane current draw of the HLCA1C1D?
A: The HLCA1C1D draws 1.2A from the 5V backplane rail. The Mark V power supply is rated at 6A on the 5V rail, so the HLCA1C1D is within the limit. If your rack has multiple HLCA boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin.

Q: Can I use the HLCA1C1D with LVDT sensors from different manufacturers?
A: The HLCA1C1D 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 HLCA1C1D specifications. The mixed fusing on the HLCA1C1D provides flexibility for different sensor configurations.

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