Key Technical Parameters

Advantages and Distinctive Features

• Solid-State-Primary Hybrid + Tachometer Feedback: 8 solid-state DC outputs (3A) + 4 mechanical relays (5A) + 2 tachometer inputs on a single board.

• 3A Solid-State Outputs with Current Monitoring: Higher current capacity with overcurrent detection.

• 5A Mechanical Relays with Predictive Maintenance: Higher current capacity with real-time contact resistance monitoring.

• Redundant Backplane Communication: Dual paths with automatic failover (<50ms).

• Dual Temperature Sensor Support (4 T/C + 8 RTD): 12 total temperature channels.

• Predictive Thermal Modeling: Learns cabinet thermal response during 24-hour initial period.

• Predictive Relay Maintenance: Relay degradation warning LED for proactive maintenance.

• RTD Fault Detection: Open/short/lead-wire degradation monitoring.

• 24-Bit Ultra-High Precision ADC: ±0.5°C for thermocouples, ±0.3°C for RTDs.

• Extended +85°C Operation: Surpasses the +75°C limit.

• 500-Event Fault Log: Comprehensive diagnostics.

Typical Application Fields

• Safety-Critical Fan-Dense Mixed Fan Systems: Where redundant communication and fan failure detection are required.

• Fan-Dense Mixed Fan Cabinets: Where DC fans are primary with AC/DC relay auxiliaries.

• RTD-Heavy Cabinets: Where RTD sensors are preferred.

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

• Desert Power Plants: 85°C upper limit.

Comparison with Related Models

Selection Recommendations

• Choose the DS3800NOAA1F1D if:

  • You need 8 solid-state DC outputs (3A) for main fans with current monitoring .

  • You also need 4 mechanical relay outputs (5A) for auxiliary devices.

  • You require tachometer feedback for fan speed verification.

  • You require redundant backplane communication for fault tolerance.

  • You require both thermocouple and RTD inputs (12 total channels).

  • You want predictive thermal modeling and predictive relay maintenance .

  • Your installation operates in extreme environments (-40°C to +85°C).

• Choose the DS3800NMFC1F1D if: You need 8 relay outputs for main fans with 4 SS auxiliaries.

• Choose the DS3800NMSA1B1A if: You need 8 SS outputs without tachometer feedback or redundant communication.

Critical Precautions

• ESD Protection: Always wear a grounded wrist strap.

• DC Polarity (SS): Solid-state outputs are DC-only and polarity-sensitive—reverse polarity destroys the MOSFET.

• SS Overcurrent: If output exceeds 3.5A, LED flashes red—persistent overcurrent triggers bus fault.

• High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/5A—lethal. Use proper insulation.

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

• RTD Wiring: Use 3-wire Pt100 RTDs. All three wires must be connected.

• Redundant Paths: Both backplane paths must be connected for full fault tolerance.

• Predictive Model Learning: Requires 24-hour initial learning—do not interrupt power.

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

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

• CPU Compatibility: Requires Mark V CPU firmware v6.0 or higher for full features.

• Power Supply: Draws 5.5A on +5V rail—verify sufficient capacity.