GE DS3800NOAB1C1B

Key Technical Parameters

Advantages and Distinctive Features

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

• Full 8 Thermocouple Inputs: Comprehensive temperature monitoring.

• Improved Temperature Accuracy (16-bit ADC): ±1°C accuracy—double the precision of the base 12-bit (±2°C) model.

• Extended Temperature Range: -20°C to +65°C supports moderately harsh environments.

• Enhanced Cold-Junction Compensation (Revision C): Improved temperature measurement stability.

• Silent, Maintenance-Free Solid-State Outputs: Unlimited cycle life for DC fans.

• Relay Auxiliary Outputs: 2500V galvanic isolation for AC/DC auxiliary loads.

• Fan Speed Verification: Tachometer inputs allow CPU to confirm fan operation.

Typical Application Fields

• Safety-Critical Mixed Fan Systems: Where fan failure detection is mandatory.

• Mixed Fan Cabinets: Where DC fans are primary with AC/DC auxiliary devices.

• Unheated Shelters & Outdoor Enclosures: -20°C to +65°C range.

• Moderately Harsh Environments: Where climate control is limited.

Comparison with Related Models

Selection Recommendations

• Choose the DS3800NOAB1C1B if:

  • You need 8 solid-state DC outputs (2A) for main fans.

  • You also need 4 mechanical relay outputs (AC/DC) for auxiliary devices.

  • You require tachometer feedback for fan speed verification.

  • You want improved temperature accuracy (±1°C).

  • Your installation requires extended temperature range (-20°C to +65°C).

  • Your cabinet uses 8 temperature sensors for comprehensive monitoring.

• Choose the DS3800NOAA1F1D if: You need 3A SS outputs, 5A relay outputs, RTD support, predictive maintenance, and extreme temperature range (-40°C to +85°C).

• Choose the DS3800NMSA1B1A if: You need the same hybrid outputs without tachometer feedback.

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 Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.

• High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/3A—lethal. Use proper insulation.

• Relay Inductive Derating: For inductive loads, derate from 3A to 2A or use RC snubbers.

• 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—tachometer monitoring disabled in fallback mode.

• Firmware Compatibility: Revision C firmware is compatible with Mark V CPU firmware v4.0 and above. For v3.x, the enhanced ADC features may be partially disabled—confirm compatibility before purchasing.