Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NGPA |
| Power Supply | +5V DC @ 2.8A, +15V DC @ 0.4A, -15V DC @ 0.3A (via backplane) |
| Temperature Inputs | 8 differential thermocouple channels (Type J/K/T, 12-bit ADC, ±2°C accuracy) |
| RTD Inputs | None |
| 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 |
| Storage Temperature | -40°C to +85°C |
| LED Indicators | Power (green), Fan Run (8x green), Over-Temp Alarm (red), Backplane Active (yellow) |
Advantages and Distinctive Features
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Simple Solid-State Design: The DS3800NGPA provides silent, maintenance-free fan control with unlimited switching cycles—no relay contacts to wear out or replace.
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Full 8 Thermocouple Inputs: Comprehensive zone-by-zone temperature monitoring for large cabinets.
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Low EMI Emissions: Solid-state switching generates minimal electromagnetic interference, making the DS3800NGPA suitable for cabinets with sensitive analog or communication 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 setpoint storage—relies entirely on the Mark V CPU, keeping the board simple and easy to troubleshoot.
Typical Application Fields
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Climate-Controlled Indoor Installations: 0°C to +60°C range supports standard power plant environments.
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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 noise is undesirable.
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Budget-Conscious Solid-State Applications: Cost-effective solution for basic DC fan control.
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High-Cycle Applications: Unlimited solid-state switching life for frequent fan cycling.
Comparison with Related Models
| Feature | DS3800NGPA | DS3800NFIB | DS3800NFMC | DS3800NFIA |
|---|---|---|---|---|
| Output Type | Solid-state (DC only) | Solid-state (DC only) | Solid-state (DC only) | Solid-state (DC only) |
| Output Current | 2A | 2A | 2A | 2A |
| Thermocouple Inputs | 8 channels | 8 channels | 4 channels | 8 channels |
| Tachometer Inputs | None | None | None | 2 channels |
| ADC Resolution | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) | 16-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 |
| Fallback Mode | Full speed (100%) | Full speed (100%) | Full speed (100%) | Full speed (100%) |
| Cost (Used) | Low | Low | Low | Medium-Low |
Selection Recommendations
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Choose the DS3800NGPA 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 speed feedback.
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Your cabinet requires 8 temperature sensors for comprehensive monitoring.
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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 DS3800NFIB if: You need the same basic functionality but prefer the “NFIB” component revision (verify compatibility).
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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: The DS3800NGPA contains sensitive MOSFET and ADC components. Always wear a grounded ESD wrist strap.
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DC Polarity and Voltage: Solid-state outputs are DC-only and polarity-sensitive. Connect positive to “+” and negative to “-“. Reverse polarity will destroy the output MOSFET. Do not exceed 48VDC—AC voltages will cause immediate catastrophic failure.
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Current Limiting: Each output is rated at 2A continuous. For fan inrush currents exceeding 4A, install an external current-limiting device. The DS3800NGPA has no built-in overcurrent protection.
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No Tachometer Inputs: The DS3800NGPA has no tachometer capability. Do not connect speed sensors.
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No Hot-Swap: Always depower the Mark V rack before inserting or removing the DS3800NGPA.
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Slot Assignment: Install in auxiliary I/O slots (typically slots 8–10). Do not install in CPU or analog input slots.
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CPU Dependency: Since the DS3800NGPA has no onboard logic, the Mark V CPU must send fan ON/OFF commands. If backplane communication is lost, the board defaults to 100% fan speed (fallback mode). Address communication issues promptly.
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Firmware Compatibility: The DS3800NGPA is compatible with all Mark V CPU firmware versions (v3.x and above). No specific CPU upgrade is needed.
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