Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NISA1B1B |
| Power Supply | +5V DC @ 3.2A, +15V DC @ 0.5A, -15V DC @ 0.3A |
| Temperature Inputs | 4 thermocouple channels (Type J/K/T, 16-bit ADC, ±1°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 | -20°C to +65°C |
| LED Indicators | Power, Fan Run (8x green), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Higher Output Current (3A): 50% improvement over the base 2A—supports larger DC fans or multiple fans in parallel.
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Improved Temperature Accuracy (16-bit ADC): ±1°C accuracy—double the precision of the base 12-bit (±2°C) model.
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Extended Temperature Range: -20°C to +65°C supports moderately harsh environments.
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Enhanced Cold-Junction Compensation (Revision B): More reliable temperature measurement.
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Fan-Dense Design: 8 outputs with only 4 temperature inputs—optimized for single-zone cooling.
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Silent, Maintenance-Free: Solid-state switching with unlimited cycle life.
Typical Application Fields
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Fan-Dense Cabinets: Where 8 fans serve a single zone with 4 sensors.
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Moderately Harsh Environments: -20°C to +65°C range.
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DC Fan-Only Installations: Where tachometer feedback is not required.
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Upgrade from Base NISA: For higher current and better accuracy.
Comparison with Related Models
| Feature | DS3800NISA1B1B | DS3800NISA (Base) | DS3800NFMC1E1C | DS3800NGPA1B1C |
|---|---|---|---|---|
| Output Current | 3A | 2A | 3A | 3A |
| T/C Inputs | 4 | 4 | 4 | 4 |
| ADC Resolution | 16-bit (±1°C) | 12-bit (±2°C) | 24-bit (±0.5°C) | 16-bit (±1°C) |
| Onboard Logic | No | No | Yes (threshold + averaging) | No |
| Operating Temp | -20°C to +65°C | 0°C to +60°C | -40°C to +75°C | -20°C to +65°C |
| Fault Log | Basic | Basic | 200 events | Basic |
| Cost | Medium | Low | High | Medium |
Selection Recommendations
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Choose the DS3800NISA1B1B if:
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Your fans are DC-powered (24V or 48V) with current draw ≤3A.
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Your cabinet uses 4 temperature sensors for 8 fan outputs.
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You want improved temperature accuracy (±1°C).
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You need extended temperature range (-20°C to +65°C).
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You do not require tachometer feedback or onboard logic.
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Choose the DS3800NFMC1E1C if: You need 3A outputs, 24-bit ADC, autonomous fallback, and extreme temperature range (-40°C to +75°C).
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Choose the base DS3800NISA if: You need 2A outputs in a climate-controlled environment.
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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Current Derating: At 65°C, derate to 2.2A per output.
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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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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.
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Firmware Compatibility: Revision B firmware is compatible with Mark V CPU firmware v4.0 and above. For v3.x, the enhanced ADC accuracy may be partially disabled—confirm compatibility before purchasing.
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