Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NMEA |
| Power Supply | +5V DC @ 3.5A, +15V DC @ 0.6A, -15V DC @ 0.4A |
| Temperature Inputs | 8 thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Relay Outputs | 8 mechanical relays, 3A continuous @ 115VAC/30VDC (surge 5A) |
| SS Outputs | 4 solid-state relays, 2A continuous @ 24–48VDC |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power, Relay Run (8x amber), SS Run (4x green), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Hybrid Output Architecture: Combines 8 mechanical relays (for AC/DC fans) with 4 solid-state outputs (for DC auxiliaries) on a single board.
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AC/DC Relay Capability: Relay outputs switch both AC (115VAC) and DC (30VDC) loads.
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Solid-State Auxiliary Outputs: Silent, maintenance-free switching for low-voltage fans or alarms.
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Full 8 Thermocouple Inputs: Comprehensive temperature monitoring.
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Complete Galvanic Isolation: 2500V isolation on relay outputs.
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CPU-Dependent Operation: No onboard logic—simple and cost-effective.
Typical Application Fields
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Mixed Fan Cabinets: Where both AC/DC exhaust fans and DC auxiliary fans are present.
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Climate-Controlled Indoor Installations: 0°C to +60°C range.
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Retrofit Applications: Replacing separate relay and solid-state boards with a single hybrid solution.
Comparison with Related Models
| Feature | DS3800NMEA | DS3800NHVE | DS3800NLBA | DS3800NISA |
|---|---|---|---|---|
| Relay Outputs | 8 × 3A @ 115VAC/30VDC | 8 × 1A @ 250VDC | 8 × 3A @ 115VAC/30VDC | None |
| SS Outputs | 4 × 2A @ 48VDC | 4 × 2A @ 48VDC | None | 8 × 2A @ 48VDC |
| T/C Inputs | 8 | 8 | 4 | 4 |
| 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 | Medium | Low | Low |
Selection Recommendations
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Choose the DS3800NMEA if:
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You need 3A relay outputs (AC or DC) for main fans.
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You also need solid-state outputs (24–48VDC) for auxiliary fans or alarms.
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You want to combine both functions in a single board.
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Your cabinet uses 8 temperature sensors for comprehensive monitoring.
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You do not require tachometer feedback.
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You have a climate-controlled environment (0°C to +60°C).
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Choose the DS3800NHVE if: You need high-voltage DC (250VDC) relay outputs with solid-state auxiliaries.
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Choose the DS3800NLBA if: You need 3A relay outputs without solid-state auxiliaries and can accept 4 thermocouple inputs.
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Choose the DS3800NISA if: You need only solid-state DC outputs.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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High-Voltage/Current Hazard: Relay outputs switch 115VAC/3A—lethal voltage/current present. Use proper insulation and safety procedures.
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Relay Inductive Derating: For inductive fan motors, derate from 3A to 2A or use RC snubbers.
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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 Current Limitation: Rated at 2A continuous @ 24–48VDC.
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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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