DS3800HLCA | New Surplus GE Mark V LVDT Input Board

Description

Product Introduction

The DS3800HLCA is a dedicated LVDT/RVDT input board for the Mark V—it processes position feedback signals from LVDT and RVDT sensors used on turbine valves and actuators. This board provides the excitation voltage for the sensors and conditions the return signals to provide accurate position feedback to the controller. The HLCA is similar to the HL0A but offers additional features or a different configuration. The board’s position feedback accuracy is critical for valve position control in gas and steam turbines.

We’ve used the HLCA in turbine control applications where valve position feedback is required. The board’s LVDT excitation and signal conditioning provided accurate position feedback for the fuel control valves, enabling precise turbine speed and load control.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the difference between the HLCA and the HL0A?
A: The HLCA and HL0A are both LVDT/RVDT input boards, but they may have different features or configurations. The HLCA may offer additional channels, enhanced diagnostics, or different signal conditioning. Check the specific configuration for details.

Q: What type of LVDT sensors does the HLCA support?
A: The HLCA 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.

Q: Does the HLCA provide LVDT excitation?
A: Yes, the HLCA provides 120V AC excitation for the LVDT sensors. The excitation frequency is 50/60Hz, depending on the system configuration.

Q: What’s the accuracy of the position measurement on the HLCA?
A: The HLCA provides position measurement with an accuracy of ±0.1% of full scale. This is sufficient for most turbine valve position control applications.

Q: Does the HLCA have conformal coating?
A: Not by default. The HLCA’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., DS3800HLCA1G1G). The standard HLCA 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 HLCA?
A: The HLCA draws approximately 1.2A from the 5V backplane rail. The Mark V power supply is rated at 6A on the 5V rail, so the HLCA 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 HLCA with LVDT sensors from different manufacturers?
A: The HLCA 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 HLCA specifications.

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