GE DS3800NLCA1D1C

Key Technical Parameters

Advantages and Distinctive Features

• 5A Mechanical Relays: 67% higher current capacity than the base 3A model—supports larger AC/DC fans.

• Tachometer Feedback: Dual tachometer inputs for fan speed verification—critical for safety-critical applications.

• 24-Bit Ultra-High Precision ADC: ±0.5°C accuracy for precise thermal management.

• Predictive Relay Maintenance: Real-time contact resistance monitoring with relay degradation warning.

• Extended Environmental Tolerance: -40°C to +75°C with 5g vibration resistance.

• Fan-Dense Design: 8 outputs with only 4 temperature inputs—optimized for single-zone cooling.

• AC/DC Output Capability: Switches both AC (115VAC) and DC (30VDC) loads.

• 200-Event Fault Log: Stores temperature alarms, tach failures, and relay degradation events.

Typical Application Fields

• Safety-Critical AC/DC Cooling Systems: Where fan failure detection and relay health monitoring are mandatory.

• Offshore Oil & Gas Platforms: Extreme temperature and vibration environments.

• Desert Power Plants: 75°C upper limit.

• Arctic Compressor Stations: -40°C low-temperature tolerance.

• Fan-Dense Cabinets: Where 8 fans serve a single zone with 4 sensors.

Comparison with Related Models

Selection Recommendations

• Choose the DS3800NLCA1D1C if:

  • You need 5A mechanical relay outputs (AC or DC).

  • Your cabinet uses 4 temperature sensors for 8 fan outputs.

  • You require tachometer feedback for fan speed verification.

  • You want ultra-precise temperature monitoring (±0.5°C).

  • You need predictive relay maintenance.

  • Your installation is in extreme environments (-40°C to +75°C) with high vibration.

• Choose the DS3800NLBA1D1D if: You need 5A relay outputs without tachometer feedback.

• Choose the DS3800NITA1C1D if: You prefer solid-state outputs (3A) with tachometer feedback and the same extreme temperature range.

Critical Precautions

• ESD Protection: Always wear a grounded wrist strap. Static damage to the 24-bit ADC degrades accuracy.

• Relay Derating: For inductive fan motors, derate from 5A to 3.5A or use RC snubbers.

• Relay Contact Wear: Predictive maintenance monitors contact resistance—replace board when degradation LED illuminates.

• Missing T/C Channels: Only 4 thermocouple inputs (channels 1–4). Channels 5–8 are physically absent.

• Tachometer Wiring: Use shielded twisted-pair cable. Connect shield to designated terminal—not at the fan end.

• No Hot-Swap: Always depower the rack before insertion/removal.

• Slot Assignment: Install in slots 8–10 (auxiliary I/O).

• CPU Dependency: If backplane communication is lost, the board defaults to 100% fan speed—all advanced features disabled in fallback mode.

• Firmware Compatibility: Revision D firmware requires Mark V CPU firmware v5.0 or higher for full 24-bit ADC, predictive maintenance, and tachometer functionality. For v4.x, reverts to 16-bit mode with no predictive maintenance.

• Power Supply: Draws 3.8A on +5V rail—verify sufficient capacity.