Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Full Model | DS3800NGRD1E1D |
| Power Supply | +5V DC @ 3.8A, +15V DC @ 0.7A, -15V DC @ 0.5A |
| Temperature Inputs | 8 thermocouple channels (Type J/K/T, 24-bit ADC, ±0.5°C accuracy) |
| Fan Outputs | 8 solid-state relays, 3A continuous @ 24–48VDC (surge 5A) |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | -40°C to +75°C |
| Vibration Resistance | 5g RMS (MIL-STD-810G) |
| Fault Log | 200 events |
| LED Indicators | Power, Fan Run (8x green), Over-Temp Alarm, Fallback Active, Bus Fault |
Advantages and Distinctive Features
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24-Bit Ultra-High Precision ADC: ±0.5°C accuracy for precise thermal management.
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3A Solid-State Outputs: 50% improvement over the base 2A rating—drives larger DC fans.
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Extended Environmental Tolerance: -40°C to +75°C with 5g vibration resistance.
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Onboard Temperature Threshold Logic: Autonomous ON/OFF fan control during backplane communication loss.
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Silent, Maintenance-Free Operation: Unlimited switching cycles with no contact wear.
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200-Event Fault Log: Stores temperature alarms and fallback events.
Typical Application Fields
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Offshore Oil & Gas Platforms: Extreme temperature and vibration environments.
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Desert Power Plants: 75°C upper limit.
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Arctic Compressor Stations: -40°C low-temperature tolerance.
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DC Fan-Only Cabinets: Where tachometer feedback is not required.
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Remote Unstaffed Stations: Autonomous fallback logic ensures cooling during communication loss.
Comparison with Related Models
| Feature | DS3800NGRD1E1D | DS3800NGRD1B1A | DS3800NGRD (Base) | DS3800NFMC1E1C |
|---|---|---|---|---|
| Output Current | 3A | 2A | 2A | 3A |
| T/C Inputs | 8 | 8 | 8 | 4 |
| ADC Resolution | 24-bit (±0.5°C) | 16-bit (±1°C) | 12-bit (±2°C) | 24-bit (±0.5°C) |
| Onboard Logic | Yes (threshold) | No | No | Yes (threshold + averaging) |
| Operating Temp | -40°C to +75°C | 0°C to +60°C | 0°C to +60°C | -40°C to +75°C |
| Vibration | 5g RMS | 1g RMS | 1g RMS | 5g RMS |
| Fault Log | 200 events | Basic | Basic | 200 events |
| Cost | High | Low-Medium | Low | High |
Selection Recommendations
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Choose the DS3800NGRD1E1D if:
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Your fans are DC-powered (24V or 48V) with current draw ≤3A.
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You do not require tachometer feedback.
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You want ultra-precise temperature monitoring (±0.5°C).
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You need autonomous fallback cooling during CPU communication loss.
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Your installation is in extreme environments (-40°C to +75°C) with high vibration.
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Choose the DS3800NFMC1E1C if: You need 3A outputs, 24-bit ADC, and adaptive averaging but can accept 4 thermocouple inputs.
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Choose the DS3800NGRD1B1A if: You need 2A outputs with 16-bit ADC in a climate-controlled environment.
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Choose the base DS3800NGRD if: You need 2A outputs without improved accuracy or onboard logic.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap. Static damage to the 24-bit ADC degrades accuracy to >3°C.
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DC Polarity: Solid-state outputs are DC-only and polarity-sensitive. Reverse polarity destroys the output MOSFET.
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Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.
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Current Derating: At 75°C, derate to 2.2A per output. For multiple channels active, reduce total load by 10% per channel.
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No Tachometer Inputs: Do not connect speed sensors.
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No Hot-Swap: Always depower the rack before insertion/removal.
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Slot Assignment: Install in slots 8–10 (auxiliary I/O).
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Fallback Configuration: Thresholds must be configured via Mark V software. If not configured, the board defaults to 100% fan speed.
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CPU Compatibility: Revision E firmware requires Mark V CPU firmware v5.0 or higher for full 24-bit ADC functionality and autonomous logic. For v4.x, the board reverts to 16-bit mode with no onboard logic.
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Power Supply: Draws 3.8A on +5V rail—verify sufficient capacity.
A-B 1769-IM12
AB 1746-OB8
AB 1771-OBD
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