Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NPDA1B1B |
| Power Supply | +5V DC @ 4.5A, +15V DC @ 0.8A, -15V DC @ 0.6A |
| Temperature Inputs | 8 thermocouple channels (Type J/K/T, 16-bit ADC, ±1°C accuracy) |
| SS Outputs | 8 solid-state relays, 3A continuous @ 24–48VDC |
| Relay Outputs | 4 mechanical relays, 5A continuous @ 115VAC/30VDC (surge 10A) |
| Tachometer Inputs | 2 channels (up to 10 kHz) |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | -20°C to +65°C |
| LED Indicators | Power, SS Run (8x green), Relay Run (4x amber), Tach Fail (red x2), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Solid-State-Primary Hybrid + Tachometer Feedback: 8 solid-state DC outputs (3A) + 4 high-current relays (5A) + 2 tachometer inputs on a single board.
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Higher Solid-State Current (3A): Supports larger DC fans compared to 2A boards.
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Higher Relay Current (5A): Supports larger AC/DC auxiliary loads compared to 3A boards.
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Full 8 Thermocouple Inputs: Comprehensive temperature monitoring.
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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): Improved temperature measurement reliability.
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Silent, Maintenance-Free Solid-State Outputs: Unlimited cycle life for DC fans.
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Relay Auxiliary Outputs: 2500V galvanic isolation for AC/DC auxiliary loads.
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Fan Speed Verification: Tachometer inputs allow CPU to confirm fan operation.
Typical Application Fields
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Safety-Critical Mixed Fan Systems: Where fan failure detection is mandatory.
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Mixed Fan Cabinets: Where larger DC fans and high-power AC/DC auxiliary devices coexist.
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Unheated Shelters & Outdoor Enclosures: -20°C to +65°C range.
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Moderately Harsh Environments: Where climate control is limited.
Comparison with Related Models
| Feature | DS3800NPDA1B1B | DS3800NPDA (Base) | DS3800NPCM1B1B | DS3800NPCS1B1B |
|---|---|---|---|---|
| SS Outputs | 8 × 3A | 8 × 3A | 8 × 3A | 4 × 3A |
| Relay Outputs | 4 × 5A | 4 × 5A | 4 × 5A | 8 × 5A |
| T/C Inputs | 8 | 8 | 8 | 8 |
| RTD Inputs | None | None | 8 | None |
| Tach Inputs | 2 channels | 2 channels | 2 channels | 2 channels |
| ADC Resolution | 16-bit (±1°C) | 12-bit (±2°C) | 16-bit (±1°C) | 16-bit (±1°C) |
| Operating Temp | -20°C to +65°C | 0°C to +60°C | -20°C to +65°C | -20°C to +65°C |
| Firmware | B | A/B | B | B |
| Cost | High | Medium-High | Very High | High |
Selection Recommendations
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Choose the DS3800NPDA1B1B if:
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You need 8 solid-state DC outputs (3A) for larger main fans.
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You also need 4 high-current mechanical relay outputs (5A) for auxiliary devices.
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You require tachometer feedback for fan speed verification.
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Your cabinet uses 8 thermocouple sensors for temperature monitoring.
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You do not require RTD inputs.
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You want improved temperature accuracy (±1°C).
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Your installation requires extended temperature range (-20°C to +65°C).
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Choose the DS3800NPCM1B1B if: You need RTD inputs with the same outputs.
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Choose the DS3800NPCS1B1B if: You need 8 relay outputs and 4 SS outputs with tachometer feedback.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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DC Polarity (SS): Solid-state outputs are DC-only and polarity-sensitive—reverse polarity destroys the MOSFET.
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SS Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.
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SS Current Limitation: Rated at 3A continuous. Verify fan current does not exceed this limit.
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High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/5A—lethal. Use proper insulation.
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Relay Inductive Derating: For inductive loads, derate from 5A to 3.5A or use RC snubbers.
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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: 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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