Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NHVD |
| 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, 1A continuous @ 250VDC (surge 2A) |
| 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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250VDC High-Voltage Output Capability: The DS3800NHVD supports 220–250VDC fan systems—ideal for high-voltage industrial, railway, and specialized turbine 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.
Typical Application Fields
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High-Voltage Industrial Fan Systems: 220VDC or 250VDC motor control.
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Railway and Traction Applications: High-voltage DC auxiliary systems.
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Specialized Turbine Installations: High-voltage DC cooling systems.
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Heavy Industrial Environments: Where 250VDC is the standard.
Comparison with Related Models
| Feature | DS3800NHVD | DS3800NHVB | DS3800NGTA |
|---|---|---|---|
| Output Voltage | 250VDC | 125VDC | 30VDC / 115VAC |
| Output Current | 1A @ 250VDC | 2A @ 125VDC | 3A @ 30VDC |
| AC Capability | No | No | Yes |
| T/C Inputs | 8 | 8 | 8 |
| Tach Inputs | None | None | None |
| ADC | 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 |
| Cost | Medium-High | Medium | Low |
Selection Recommendations
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Choose the DS3800NHVD if:
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Your fans operate on 220–250VDC 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 DS3800NHVB if: Your fans operate on 110–125VDC systems.
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Choose the DS3800NGTA if: Your fans operate on standard 24/48VDC or 115VAC.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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Extreme High-Voltage Hazard: The DS3800NHVD switches 250VDC—lethal voltage present on relay output terminals. Observe all high-voltage safety procedures. Ensure wiring is properly insulated and rated for ≥250VDC.
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DC Polarity: Outputs are DC only—observe correct polarity.
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Current Limitation: Rated at only 1A continuous. Verify fan current does not exceed this limit.
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Inductive Load Derating: For inductive fan motors, derate to 0.75A or use external RC snubbers (rated for 250VDC).
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No AC Connection: Do not connect AC loads—the DS3800NHVD 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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