Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Full Model | DS3800NGTA1F1E |
| Power Supply | +5V DC @ 4.5A, +15V DC @ 0.9A, -15V DC @ 0.6A |
| Temperature Inputs | 8 thermocouple channels (Type J/K/T, 24-bit ADC, ±0.5°C accuracy) |
| Fan Outputs | 8 mechanical relays, 8A continuous @ 250VAC/30VDC (surge 15A) |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | -40°C to +85°C |
| Vibration Resistance | 5g RMS (MIL-STD-810G) |
| Fault Log | 500 events |
| LED Indicators | Power, Fan Run (8x amber), Over-Temp Alarm, Relay Degradation, Predictive Model Active, Backplane Active, Bus Fault |
Advantages and Distinctive Features
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8A Mechanical Relays: Highest current capacity in the “NGTA” family—supports 1HP AC fans.
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Extended +85°C Operation: Surpasses the +75°C limit for extreme environments.
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Predictive Thermal Modeling (Revision F): Learns cabinet thermal response during 24-hour initial period, reducing temperature overshoot by up to 50%.
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Predictive Relay Maintenance: Real-time contact resistance monitoring with relay degradation warning.
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24-Bit Ultra-High Precision ADC: ±0.5°C accuracy for precise thermal management.
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500-Event Fault Log: Comprehensive diagnostics.
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Silver-Alloy Relay Contacts: Superior resistance to welding and pitting.
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AC/DC Output Capability: Switches both AC and DC loads.
Typical Application Fields
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Extreme Desert Solar-Thermal Plants: +85°C ambient environments.
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Engine Rooms and Turbine Enclosures: High-temperature, high-vibration areas.
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Offshore Oil & Gas Platforms: Extreme conditions with AI-driven cooling.
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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.
Comparison with Related Models
| Feature | DS3800NGTA1F1E | DS3800NGTA1E1D | DS3800NGTA1D1D | DS3800NFEE1E1E |
|---|---|---|---|---|
| Relay Current | 8A | 5A | 5A | 8A |
| ADC Resolution | 24-bit (±0.5°C) | 24-bit (±0.5°C) | 24-bit (±0.5°C) | 24-bit (±0.5°C) |
| Predictive Maintenance | Yes | Yes | Yes | Yes |
| Predictive Thermal Modeling | Yes | Yes | No | No |
| Operating Temp | -40°C to +85°C | -40°C to +75°C | -40°C to +75°C | -40°C to +75°C |
| Fault Log | 500 events | 500 events | 200 events | 100 events |
| Tach Inputs | None | None | None | None |
| Cost | Ultra-Premium | High | Premium | Very High |
Selection Recommendations
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Choose the DS3800NGTA1F1E if:
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You need 8A relay outputs for large AC fans.
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You want predictive thermal modeling for proactive temperature management.
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You require predictive relay maintenance.
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Your installation operates in extreme heat up to +85°C .
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You need 500-event fault logging.
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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 but without predictive thermal modeling or extended +85°C.
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Choose the DS3800NGTA1E1D if: You need 5A relay outputs with predictive modeling and +75°C operation.
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 8A to 6A or use RC snubbers.
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No Tachometer Inputs: Do not connect speed sensors.
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Predictive Model Learning: Requires 24-hour initial learning period—do not interrupt power.
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Model Reset: Reset via Mark V software if cabinet configuration changes.
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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—all advanced features disabled in fallback mode.
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Firmware Compatibility: Revision F requires Mark V CPU firmware v5.5 or higher for full predictive modeling, predictive maintenance, and 24-bit ADC. For v5.0–v5.4, predictive modeling disabled (maintenance and ADC still function). For v4.x, reverts to 16-bit mode.
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Power Supply: Draws 4.5A on +5V rail—verify sufficient capacity.
A-B 1746-P2
A-B 1734-IE2V
SCHNEIDER 140CPS12400
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