DS3800HLCB1C1B | Mark V Speedtronic Position Sensor Card

Description

Product Introduction

The DS3800HLCB1C1B is the diagnostic LVDT/RVDT input 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 position feedback processing with per-channel diagnostics (open-circuit, short-circuit, and sensor health monitoring). The locking terminals ensure reliable connections in high-vibration environments, and the mixed fusing allows you to match protection to different sensor configurations—1A for standard sensors and 0.8A for lower-current applications. The diagnostic features make it easier to troubleshoot position feedback issues, and the bi-color LEDs provide immediate visual feedback.

We’ve used the HLCB1C1B in a steam turbine control application where valve position feedback is critical. The diagnostic features allowed us to detect a failing LVDT sensor before it caused a control issue, enabling us to replace it during a scheduled outage. The locking terminals prevented intermittent connections from the LVDT sensors, and the mixed fusing provided flexible protection for different sensor circuits.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What diagnostics does the HLCB1C1B provide?
A: The HLCB1C1B provides per-channel open-circuit detection, short-circuit detection, and sensor health monitoring. The diagnostics are reported via the backplane and via bi-color LEDs on the board. This allows you to detect a failing sensor, a broken wire, or a shorted sensor before it causes a control issue. The diagnostic features are built into the board and require no special configuration to use.

Q: How do the diagnostic LEDs work on the HLCB1C1B?
A: The HLCB1C1B uses bi-color LEDs (green/red). Green indicates the channel is functioning normally. Red indicates a fault condition—open circuit, short circuit, or a sensor health issue. This provides immediate visual feedback for troubleshooting, making it easier to identify and resolve position feedback issues.

Q: Why does the HLCB1C1B have mixed fusing (1A and 0.8A)?
A: The mixed fusing allows you to match protection to different sensor configurations. The 1A bank is for standard LVDT sensors with moderate cable runs. The 0.8A bank is for lower-current applications or sensors with shorter cable runs. This provides flexibility while maintaining protection.

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: Does the HLCB1C1B 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., DS3800HLCB1G1B). The standard HLCB1C1B 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 HLCB1C1B?
A: The HLCB1C1B draws 1.3A from the 5V backplane rail. The Mark V power supply is rated at 6A on the 5V rail, so the HLCB1C1B is within the limit. If your rack has multiple HLCB boards, check your total backplane current. We recommend keeping total backplane current below 5.5A for margin.

Q: Can I use the HLCB1C1B with LVDT sensors from different manufacturers?
A: The HLCB1C1B 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 HLCB1C1B specifications. The mixed fusing on the HLCB1C1B provides flexibility for different sensor configurations.

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