Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NGRD |
| Power Supply | +5V DC @ 2.8A, +15V DC @ 0.4A, -15V DC @ 0.3A |
| Temperature Inputs | 8 differential thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Fan Outputs | 8 solid-state relays, 2A continuous @ 24–48VDC (DC only) |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power, Fan Run (8x green), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Simple Solid-State Design: Silent, maintenance-free operation with unlimited switching cycles—no relay contacts to wear out.
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Full 8 Thermocouple Inputs: Comprehensive zone-by-zone temperature monitoring.
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Low EMI Emissions: Solid-state switching minimizes electromagnetic interference—ideal for cabinets with sensitive analog cards.
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Cost-Effective: One of the most affordable solid-state fan control boards in the Mark V lineup.
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CPU-Dependent Operation: No onboard logic—simple and easy to troubleshoot.
Typical Application Fields
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Climate-Controlled Indoor Installations: 0°C to +60°C range.
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DC Fan-Only Cabinets: Where tachometer feedback is not required.
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Silent Operation Priority: Facilities where mechanical relay clicking is undesirable.
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High-Cycle Applications: Unlimited solid-state switching life for frequent fan cycling.
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Budget-Conscious Solid-State Applications.
Comparison with Related Models
| Feature | DS3800NGRD | DS3800NGPA | DS3800NFIB | DS3800NFMC |
|---|---|---|---|---|
| Output Current | 2A | 2A | 2A | 2A |
| T/C Inputs | 8 | 8 | 8 | 4 |
| Tach Inputs | None | None | None | None |
| ADC | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) |
| Onboard Logic | No | No | No | No |
| Operating Temp | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C |
| Cost | Low | Low | Low | Low |
Selection Recommendations
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Choose the DS3800NGRD if:
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Your fans are DC-powered (24V or 48V) with current draw ≤2A.
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You do not require tachometer feedback.
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You want a simple, cost-effective solid-state solution.
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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 DS3800NFMC if: You need 4 thermocouple inputs with 8 outputs (fan-dense configuration) at a lower cost.
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Choose the DS3800NFIA if: You need tachometer feedback with solid-state DC outputs.
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. Connect positive to “+” and negative to “-“. 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 Limiting: Rated at 2A continuous. For fan inrush >4A, install external current limiting.
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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: Compatible with all Mark V CPU firmware versions (v3.x and above).
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