DS3800HLEA1B1B | GE Mark V LVDT/RVDT Output Module

Description

Product Introduction

The DS3800HLEA1B1B is the dedicated LVDT/RVDT output board in the 1B1B configuration—spring-cage terminals and 0.8A fusing on both banks. This board provides the 120V AC excitation signals for LVDT and RVDT position sensors used on turbine valves and actuators. The spring-cage terminals make field wiring faster than screw-clamp, and the 0.8A fuses provide reliable protection for the excitation circuits. The HLEA1B1B 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 HLEA1B1B in a gas turbine control application where stable excitation signals were required for the LVDT sensors on the fuel control valves. The spring-cage terminals saved time during installation, and the 0.8A fuses provided reliable protection for the excitation circuits. The board provided stable 120V AC excitation, enabling accurate position feedback for the fuel control valves.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the advantage of the spring-cage terminals on the 1B1B?
A: Spring-cage terminals use a stainless steel spring to grip the wire—push the wire in and it’s locked. This is faster than screw-clamp (which requires a screwdriver and torque control). Spring-cage is also more resistant to vibration loosening. The 1B1B is the preferred choice for new installations where wiring speed matters.

Q: Why does the HLEA1B1B have 0.8A fuses on both banks?
A: The 0.8A fuses provide reliable protection for the excitation circuits. The LVDT sensors draw minimal current, but the 0.8A rating provides some headroom while still protecting the board from shorts. This is the standard configuration for the HLEA board.

Q: What type of LVDT sensors does the HLEA1B1B support?
A: The HLEA1B1B 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 HLEA1B1B provide stable excitation voltage?
A: Yes, the HLEA1B1B 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 HLEA1B1B have conformal coating?
A: Not by default. The 1B1B suffix indicates spring-cage terminals and 0.8A fusing, not coating. If you need conformal coating for harsh environments, look for a suffix with a “G” (e.g., DS3800HLEA1G1G). The standard HLEA1B1B 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 HLEA1B1B?
A: The HLEA1B1B draws 1.2A from the 5V backplane rail. The Mark V power supply is rated at 6A on the 5V rail, so the HLEA1B1B 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 HLEA1B1B with LVDT sensors from different manufacturers?
A: The HLEA1B1B 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 HLEA1B1B specifications. The spring-cage terminals on the 1B1B make field wiring faster and easier for multi-channel installations.

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