Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NHVB |
| Power Supply | +5V DC @ 3.0A, +15V DC @ 0.5A, -15V DC @ 0.3A |
| Temperature Inputs | 8 differential thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Fan Outputs | 8 mechanical relays, 2A continuous @ 125VDC (surge 3A) |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power, Fan Run (8x amber), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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High-Voltage DC Outputs (125VDC): The DS3800NHVB supports 110–125VDC fan systems—critical for legacy turbine installations, military, and marine applications.
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Mechanical Relay Isolation: 2500V galvanic isolation between control logic and high-voltage fan circuits.
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Full 8 Thermocouple Inputs: Comprehensive temperature monitoring.
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Simple, CPU-Dependent Operation: No onboard logic—cost-effective and reliable.
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Standard Temperature Range: 0°C to +60°C for climate-controlled environments.
Typical Application Fields
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Legacy Turbine Installations: Older systems using 110VDC or 125VDC fan motors.
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Military & Naval Applications: High-voltage DC systems common in shipboard environments.
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Marine Propulsion Turbines: 125VDC auxiliary systems.
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Industrial DC Fan Systems: Where standard 24/48VDC is insufficient.
Comparison with Related Models
| Feature | DS3800NHVB | DS3800NGTA | DS3800NFEE | DS3800NGRA |
|---|---|---|---|---|
| Output Voltage | 125VDC | 30VDC / 115VAC | 30VDC / 115VAC | 30VDC / 115VAC |
| Output Current | 2A @ 125VDC | 3A @ 30VDC | 3A @ 30VDC | 5A @ 30VDC |
| AC Capability | No (DC only) | Yes | Yes | Yes |
| T/C Inputs | 8 | 8 | 8 | 8 |
| Tach Inputs | None | None | None | None |
| ADC | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) |
| Operating Temp | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C |
| Cost | Medium | Low | Low | Medium |
Selection Recommendations
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Choose the DS3800NHVB if:
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Your fans operate on 110–125VDC high-voltage DC systems.
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You do not require tachometer feedback.
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You need 8 temperature sensors.
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You have a climate-controlled environment (0°C to +60°C).
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Choose the DS3800NGTA or DS3800NFEE if: Your fans operate on standard 24/48VDC or 115VAC.
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Choose the DS3800NGRA if: You need 5A relay capacity.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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High-Voltage Hazard: The DS3800NHVB switches 125VDC—lethal voltage present on relay output terminals. Observe all high-voltage safety procedures. Ensure wiring is properly insulated and rated for ≥125VDC.
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DC Polarity: Outputs are DC only—observe correct polarity.
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Inductive Load Derating: For inductive fan motors, derate to 1.5A or use external RC snubbers (rated for 125VDC).
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No AC Connection: Do not connect AC loads—the DS3800NHVB is DC-only.
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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: Compatible with all Mark V CPU firmware versions (v3.x and above).
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