Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NLBA |
| Power Supply | +5V DC @ 3.0A, +15V DC @ 0.5A, -15V DC @ 0.3A |
| Temperature Inputs | 4 thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Fan Outputs | 8 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, Fan Run (8x amber), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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AC/DC Output Capability: Switches both AC (115VAC) and DC (30VDC) loads—versatile for mixed cabinet installations.
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Fan-Dense Design: 8 outputs with only 4 temperature inputs—optimized for single-zone cooling.
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Mechanical Relay Isolation: 2500V galvanic isolation between control logic and fan power.
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High Surge Handling: 5A surge capacity for fan startup currents.
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Cost-Effective: Simple, CPU-dependent operation with no onboard logic.
Typical Application Fields
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Fan-Dense Cabinets: Where 8 fans serve a single zone with 4 sensors.
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Mixed AC/DC Fan Installations: Where both AC and DC fans are present.
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Climate-Controlled Indoor Installations: 0°C to +60°C range.
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Budget-Conscious Applications: Cost-effective relay-based solution.
Comparison with Related Models
| Feature | DS3800NLBA | DS3800NISA | DS3800NGTA | DS3800NFEE |
|---|---|---|---|---|
| Output Type | Mechanical relay | Solid-state | Mechanical relay | Mechanical relay |
| Output Current | 3A | 2A | 3A | 3A |
| T/C Inputs | 4 | 4 | 8 | 8 |
| Tach Inputs | None | None | None | None |
| AC Capability | Yes | No | Yes | Yes |
| 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 | Low | Low | Low | Low |
Selection Recommendations
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Choose the DS3800NLBA if:
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You need 3A mechanical relay outputs (AC or DC).
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Your cabinet uses 4 temperature sensors for 8 fan outputs.
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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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The Mark V CPU handles all control logic.
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Choose the DS3800NISA if: You prefer solid-state DC outputs (silent, maintenance-free).
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Choose the DS3800NGTA if: You need 8 temperature inputs with relay outputs.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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Relay Contact Wear: Rated for 100,000 operations at 3A.
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Inductive Load Derating: For inductive fan motors, derate to 2A or use external RC snubbers.
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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: Compatible with all Mark V CPU firmware versions (v3.x and above).
SIEMENS 6ES7972-0BB12-OXAO
A-B 1492-SPM2B060
A-B 1786-TPS
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