Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Full Model | DS3800NGTA1D1D |
| Power Supply | +5V DC @ 3.6A, +15V DC @ 0.6A, -15V DC @ 0.4A |
| Temperature Inputs | 8 thermocouple channels (Type J/K/T, 24-bit ADC, ±0.5°C accuracy) |
| Fan Outputs | 8 mechanical relays, 5A continuous @ 250VAC/30VDC (surge 10A) |
| 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 amber), Over-Temp Alarm, Relay Degradation Warning, Backplane Active, Bus Fault |
Advantages and Distinctive Features
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5A Mechanical Relays: 67% higher current capacity than the base 3A model—supports larger fans.
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24-Bit Ultra-High Precision ADC: ±0.5°C accuracy for precise thermal management.
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Predictive Relay Maintenance: Real-time contact resistance monitoring with yellow “Relay Degradation” warning LED.
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Extended Environmental Tolerance: -40°C to +75°C with 5g vibration resistance.
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Silver-Alloy Relay Contacts: Superior resistance to welding and pitting.
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200-Event Fault Log: Stores temperature alarms, relay degradation events, and fallback activations.
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AC/DC Output Capability: Switches both AC and DC loads.
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 for un-air-conditioned shelters.
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Arctic Compressor Stations: -40°C low-temperature tolerance.
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Safety-Critical Cooling Systems: Where relay health monitoring is mandatory.
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Large Fan Applications: 5A capacity for 1/2 HP AC fans.
Comparison with Related Models
| Feature | DS3800NGTA1D1D | DS3800NGTA (Base) | DS3800NGRC1D1D | DS3800NFEE1E1E |
|---|---|---|---|---|
| Relay Current | 5A | 3A | 5A | 8A |
| ADC Resolution | 24-bit (±0.5°C) | 12-bit (±2°C) | 24-bit (±0.5°C) | 24-bit (±0.5°C) |
| Predictive Maintenance | Yes | No | Yes | Yes |
| Tach Inputs | None | None | None | None |
| Operating Temp | -40°C to +75°C | 0°C to +60°C | -40°C to +75°C | -40°C to +75°C |
| Fault Log | 200 events | Basic | 200 events | 100 events |
| Cost | Premium | Low | Premium | Very High |
Selection Recommendations
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Choose the DS3800NGTA1D1D if:
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You need 5A relay outputs with ultra-precise temperature monitoring (±0.5°C).
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You want predictive relay maintenance.
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Your installation is in extreme environments (-40°C to +75°C) with high vibration.
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You do not require tachometer feedback.
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Choose the DS3800NFEE1E1E if: You need 8A relay outputs with 24-bit ADC.
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Choose the DS3800NGTA (base) if: You need 3A relays without high precision or extreme temperature tolerance.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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Relay Derating: For inductive motor loads, derate from 5A to 3.5A or use RC snubbers.
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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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CPU Dependency: If backplane communication is lost, the board defaults to 100% fan speed—predictive maintenance is disabled in fallback mode.
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Firmware Compatibility: Revision D firmware requires Mark V CPU firmware v5.0 or higher for full predictive maintenance and 24-bit ADC functionality. For v4.x, the board reverts to 16-bit mode with no predictive maintenance.
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Power Supply: Draws 3.6A on +5V rail—verify sufficient capacity.
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