Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NMEC1B1A |
| Power Supply | +5V DC @ 3.6A, +15V DC @ 0.6A, -15V DC @ 0.4A |
| Temperature Inputs | 4 thermocouple channels (Type J/K/T, 16-bit ADC, ±1°C accuracy) |
| Relay Outputs | 8 mechanical relays, 5A continuous @ 115VAC/30VDC (surge 10A) |
| 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 (5A) with 4 solid-state outputs (2A) on a single board.
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Improved Temperature Accuracy (16-bit ADC): ±1°C accuracy—double the precision of the base 12-bit (±2°C) model.
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Higher Relay Current (5A): Supports larger AC/DC fans compared to standard 3A hybrid boards.
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Fan-Dense Design: 8 relay outputs + 4 SS outputs with only 4 temperature inputs—optimized for single-zone cooling.
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Solid-State Auxiliary Outputs: Silent, maintenance-free switching for low-voltage fans or alarms.
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Enhanced Cold-Junction Compensation (Revision B): Improved temperature measurement reliability.
Typical Application Fields
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Fan-Dense Mixed Fan Cabinets: Where both high-power AC/DC fans and low-voltage DC auxiliary fans are present.
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Climate-Controlled Indoor Installations: 0°C to +60°C range.
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Upgrade from Base NMEC: For improved temperature accuracy.
Comparison with Related Models
| Feature | DS3800NMEC1B1A | DS3800NMEC (Base) | DS3800NMEA | DS3800NLCA |
|---|---|---|---|---|
| Relay Outputs | 8 × 5A | 8 × 5A | 8 × 3A | 8 × 3A |
| SS Outputs | 4 × 2A | 4 × 2A | 4 × 2A | None |
| T/C Inputs | 4 | 4 | 8 | 4 |
| ADC Resolution | 16-bit (±1°C) | 12-bit (±2°C) | 12-bit (±2°C) | 12-bit (±2°C) |
| Tach Inputs | None | None | None | 2 channels |
| Operating Temp | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C | 0°C to +60°C |
| Firmware | B | A | A/B | A/B |
| Cost | Medium | Medium | Medium | Medium |
Selection Recommendations
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Choose the DS3800NMEC1B1A if:
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You need 5A 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 improved temperature accuracy (±1°C).
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You want to combine both functions in a single board.
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Your cabinet uses 4 temperature sensors for 8 relay outputs + 4 SS outputs.
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You have a climate-controlled environment (0°C to +60°C).
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Choose the DS3800NMEA if: You need 8 thermocouple inputs with hybrid outputs.
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Choose the DS3800NLCA if: You need tachometer feedback with relay 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/5A—lethal voltage/current present. Use proper insulation.
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Relay Inductive Derating: For inductive fan motors, derate from 5A to 3.5A 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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Missing T/C Channels: Only 4 thermocouple inputs (channels 1–4). Channels 5–8 are physically absent.
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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: Revision B firmware is compatible with Mark V CPU firmware v4.0 and above. For v3.x, the enhanced ADC accuracy may be partially disabled—confirm compatibility before purchasing.
SCHNEIDER TM2DDI16DT
A-B 1794-TB3T
SIEMENS 3NE3338-8
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