Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NITA |
| Power Supply | +5V DC @ 3.0A, +15V DC @ 0.5A, -15V DC @ 0.3A |
| Temperature Inputs | 4 thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Fan Outputs | 8 solid-state relays, 2A continuous @ 24–48VDC |
| Tachometer Inputs | 2 channels (up to 10 kHz) |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power, Fan Run (8x green), Tach Fail (red x2), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Tachometer Feedback: Dual tachometer inputs allow the CPU to confirm fan operation—critical for safety-critical cooling systems.
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Fan-Dense Design: 8 outputs with only 4 temperature inputs—optimized for single-zone cooling with speed verification.
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Solid-State Outputs: Silent, maintenance-free switching with unlimited cycle life.
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Low EMI Emissions: Ideal for cabinets with sensitive analog cards.
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CPU-Dependent Operation: No onboard logic—simple and cost-effective.
Typical Application Fields
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Safety-Critical DC Cooling Systems: Where fan failure must be detected immediately.
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Fan-Dense Cabinets: Where 8 fans serve a single zone with 4 sensors.
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Climate-Controlled Indoor Installations: 0°C to +60°C range.
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High-Cycle Applications: Unlimited solid-state switching life.
Comparison with Related Models
| Feature | DS3800NITA | DS3800NISA | DS3800NFIA | DS3800NISA1B1B |
|---|---|---|---|---|
| Outputs | 8 × 2A SS | 8 × 2A SS | 8 × 2A SS | 8 × 3A SS |
| T/C Inputs | 4 | 4 | 8 | 4 |
| Tach Inputs | 2 channels | None | 2 channels | None |
| ADC | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) | 16-bit (±1°C) |
| Onboard Logic | No | No | No | No |
| Operating Temp | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C | -20°C to +65°C |
| Cost | Medium | Low | Medium | Medium |
Selection Recommendations
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Choose the DS3800NITA if:
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Your fans are DC-powered (24V or 48V) with current draw ≤2A.
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Your cabinet uses 4 temperature sensors for 8 fan outputs.
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You require tachometer feedback for fan speed verification.
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You have a climate-controlled environment (0°C to +60°C).
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The Mark V CPU handles all control logic.
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Choose the DS3800NISA if: You need the same design but do not require tachometer feedback.
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Choose the DS3800NFIA if: You need 8 thermocouple inputs with tachometer feedback.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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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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Missing T/C Channels: Only 4 thermocouple inputs (channels 1–4). Channels 5–8 are physically absent.
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Tachometer Wiring: Use shielded twisted-pair cable. Connect shield to designated terminal—not at the fan end.
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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—tachometer monitoring disabled in fallback mode.
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Firmware Compatibility: Compatible with all Mark V CPU firmware versions (v3.x and above).
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