Description
Key Technical Parameters
| Parameter | Specification |
|---|---|
| Manufacturer | General Electric (GE) |
| Series | Mark V (Speedtronic) |
| Full Model | DS3800NPSB |
| Power Supply | +5V DC @ 4.8A, +15V DC @ 0.9A, -15V DC @ 0.7A |
| Temperature Inputs | 4 thermocouple channels (12-bit ADC, ±2°C accuracy) |
| Relay Outputs | 8 mechanical relays, 5A continuous @ 115VAC/30VDC (surge 10A) |
| SS Outputs | 4 solid-state relays, 3A continuous @ 24–48VDC |
| Tachometer Inputs | 2 channels (up to 10 kHz) |
| 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), Tach Fail (red x2), Over-Temp Alarm, Backplane Active |
Advantages and Distinctive Features
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Relay-Primary Hybrid + Tachometer Feedback: 8 high-current mechanical relays (5A) + 4 solid-state DC outputs (3A) + 2 tachometer inputs on a single board.
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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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Higher Relay Current (5A): Supports larger AC/DC fans compared to 3A relay boards.
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Higher Solid-State Current (3A): Supports larger DC auxiliary loads compared to 2A boards.
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Fan Speed Verification: Tachometer inputs allow CPU to confirm fan operation.
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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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Safety-Critical Fan-Dense Mixed Fan Systems: Where high-power fan control and fan failure detection are mandatory.
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Fan-Dense Mixed Fan Cabinets: Where high-power AC/DC fans and DC auxiliary devices coexist with limited temperature sensors.
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Climate-Controlled Indoor Installations: 0°C to +60°C range.
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Cost-Conscious Applications: Where RTD inputs are not required.
Comparison with Related Models
| Feature | DS3800NPSB | DS3800NPRB | DS3800NPCS | DS3800NMFC |
|---|---|---|---|---|
| Relay Outputs | 8 × 5A | 8 × 5A | 8 × 5A | 8 × 5A |
| SS Outputs | 4 × 3A | 4 × 3A | 4 × 3A | 4 × 2A |
| T/C Inputs | 4 | 4 | 8 | 4 |
| RTD Inputs | None | 8 | None | None |
| Tach Inputs | 2 channels | 2 channels | 2 channels | 2 channels |
| 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 | High | Very High | High | Medium |
Selection Recommendations
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Choose the DS3800NPSB if:
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You need 8 high-current mechanical relay outputs (5A) for main fans.
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You also need 4 solid-state outputs (3A) for DC auxiliary devices.
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You require tachometer feedback for fan speed verification.
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Your cabinet uses 4 temperature sensors for 12 total outputs (fan-dense configuration).
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You do not require RTD inputs.
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You have a climate-controlled environment (0°C to +60°C).
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Choose the DS3800NPRB if: You need RTD inputs with the same outputs.
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Choose the DS3800NMFC if: You need lower solid-state current (2A) with the same outputs.
Critical Precautions
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ESD Protection: Always wear a grounded wrist strap.
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High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/5A—lethal. 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 Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.
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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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Tachometer Wiring: Use shielded twisted-pair cable. Connect shield to designated terminal—not at the fan end.
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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—tachometer monitoring disabled in fallback mode.
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Firmware Compatibility: The DS3800NPSB is compatible with all Mark V CPU firmware versions (v3.x and above). No specific CPU upgrade is needed.
A-B 1756-TBCH
A-B 1794-TB2
SIEMENS 6ES7291-8BA20-0XA0
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