Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NMSA1B1A |
| Power Supply | +5V DC @ 3.6A, +15V DC @ 0.6A, -15V DC @ 0.4A |
| Temperature Inputs | 8 thermocouple channels (Type J/K/T, 16-bit ADC, ±1°C accuracy) |
| SS Outputs | 8 solid-state relays, 2A continuous @ 24–48VDC |
| Relay Outputs | 4 mechanical relays, 3A continuous @ 115VAC/30VDC (surge 5A) |
| Tachometer Inputs | None |
| Communication | Mark V proprietary parallel backplane bus |
| Operating Temperature | 0°C to +60°C |
| LED Indicators | Power, SS Run (8x green), Relay Run (4x amber), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Solid-State-Primary Hybrid Architecture: 8 solid-state DC outputs for main fans + 4 mechanical relays for AC/DC auxiliary devices.
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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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Full 8 Thermocouple Inputs: Comprehensive temperature monitoring.
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Silent, Maintenance-Free Solid-State Outputs: Unlimited cycle life for DC fans.
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Relay Auxiliary Outputs: 2500V galvanic isolation for AC/DC auxiliary loads.
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Low EMI Emissions: Solid-state outputs minimize interference with sensitive cards.
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Enhanced Cold-Junction Compensation (Revision B): Improved temperature measurement reliability.
Typical Application Fields
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Mixed Fan Cabinets: Where DC fans are primary with AC/DC auxiliary devices (alarms, indicators, contactors).
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Climate-Controlled Indoor Installations: 0°C to +60°C range.
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Upgrade from Base NMSA: For improved temperature accuracy.
Comparison with Related Models
| Feature | DS3800NMSA1B1A | DS3800NMSA (Base) | DS3800NISA1B1B | DS3800NMEA |
|---|---|---|---|---|
| SS Outputs | 8 × 2A | 8 × 2A | 8 × 3A | 4 × 2A |
| Relay Outputs | 4 × 3A | 4 × 3A | None | 8 × 3A |
| T/C Inputs | 8 | 8 | 4 | 8 |
| ADC Resolution | 16-bit (±1°C) | 12-bit (±2°C) | 16-bit (±1°C) | 12-bit (±2°C) |
| Tach Inputs | None | None | None | None |
| Operating Temp | 0°C to +60°C | 0°C to +60°C | -20°C to +65°C | 0°C to +60°C |
| Cost | Medium | Medium | Medium | Medium |
Selection Recommendations
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Choose the DS3800NMSA1B1A if:
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You need 8 solid-state DC outputs (2A) for main fans.
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You also need 4 mechanical relay outputs (AC/DC) for auxiliary devices.
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You want improved temperature accuracy (±1°C).
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Your cabinet uses 8 temperature sensors for comprehensive monitoring.
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You have a climate-controlled environment (0°C to +60°C).
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Choose the DS3800NISA1B1B if: You need only solid-state outputs (3A) with extended temperature range (-20°C to +65°C).
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Choose the DS3800NMEA if: You need 8 relay outputs for main fans with 4 SS auxiliaries.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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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 Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.
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High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/3A—lethal. Use proper insulation.
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Relay Inductive Derating: For inductive loads, derate from 3A to 2A or use RC snubbers.
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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.
A-B 1784-CF128
A-B 1756-TBNH
A-B 1746-OB16
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