DS3800HLEA1C1B | GE Mark V LVDT/RVDT Output Module

Description

Product Introduction

The DS3800HLEA1C1B is the dedicated LVDT/RVDT output board in the 1C1B configuration—locking spring-cage terminals with 1A fusing on Bank 1 and 0.8A fusing on Bank 2. This board provides the 120V AC excitation signals for LVDT and RVDT position sensors used on turbine valves and actuators. The locking terminals ensure reliable connections in high-vibration environments, and the asymmetric fusing allows you to match protection to different excitation circuit requirements—1A for circuits with slightly higher current needs and 0.8A for standard circuits. The HLEA1C1B is used in conjunction with LVDT input boards to complete the position feedback loop.

We’ve used the HLEA1C1B in a steam turbine control application where stable excitation signals were required for the LVDT sensors on the valve position actuators. The locking terminals prevented intermittent connections in the high-vibration environment, and the mixed fusing provided flexible protection for different excitation circuits. The board provided stable 120V AC excitation, enabling accurate position feedback for the valve control loops.

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 excitation circuits, where intermittent connections can cause position feedback errors. The locking mechanism is a simple but effective solution for high-vibration environments.

Q: Why does the HLEA1C1B have mixed fusing (1A and 0.8A)?
A: The mixed fusing allows you to match protection to different excitation circuit requirements. The 1A bank is for circuits with slightly higher current needs or longer cable runs. The 0.8A bank is for standard excitation circuits. This provides flexibility while maintaining protection for the excitation circuits.

Q: What type of LVDT sensors does the HLEA1C1B support?
A: The HLEA1C1B 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 HLEA1C1B provide stable excitation voltage?
A: Yes, the HLEA1C1B provides stable 120V AC excitation voltage for the LVDT sensors. The board uses precision signal generation circuitry to ensure stable and accurate excitation, which is essential for accurate position feedback.

Q: Does the HLEA1C1B have conformal coating?
A: Not by default. The 1C1B 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., DS3800HLEA1G1B). The standard HLEA1C1B 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 HLEA1C1B?
A: The HLEA1C1B draws 1.2A from the 5V backplane rail. The Mark V power supply is rated at 6A on the 5V rail, so the HLEA1C1B 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: Can I use the HLEA1C1B with LVDT sensors from different manufacturers?
A: The HLEA1C1B is designed for standard 120V AC-excited LVDT sensors. Most industrial LVDT sensors from major manufacturers are compatible. However, always verify the sensor’s excitation requirements and output characteristics before installation. Consult the sensor data sheet and compare with the HLEA1C1B specifications. The locking terminals on the 1C suffix make this variant ideal for high-vibration turbine installations.

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