GE DS3800NPPB

Key Technical Parameters

Advantages and Distinctive Features

• Solid-State-Primary Hybrid Architecture: 8 solid-state DC outputs (3A) + 4 high-current relays (5A) on a single board.

• Dual Temperature Sensor Support (4 T/C + 8 RTD): 12 total channels—optimized for RTD-heavy applications with limited T/C requirements.

• Higher Solid-State Current (3A): Supports larger DC fans compared to 2A boards.

• Higher Relay Current (5A): Supports larger AC/DC auxiliary loads compared to 3A boards.

• RTD Fault Detection: Continuous monitoring for open-circuit, short-circuit, or lead-wire degradation.

• Cost-Effective: No tachometer circuitry reduces cost.

• Silent, Maintenance-Free Solid-State Outputs: Unlimited cycle life for DC fans.

• Relay Auxiliary Outputs: 2500V galvanic isolation for AC/DC auxiliary loads.

• Low EMI Emissions: Solid-state outputs minimize interference with sensitive cards.

Typical Application Fields

• RTD-Heavy Mixed Fan Cabinets: Where RTD sensors are preferred over thermocouples with DC fans and AC/DC auxiliary devices.

• Nuclear Auxiliary Turbines: High reliability with redundant temperature sensing.

• Climate-Controlled Indoor Installations: 0°C to +60°C range.

• Cost-Conscious Applications: Where tachometer feedback is not required.

Comparison with Related Models

Selection Recommendations

• Choose the DS3800NPPB if:

  • You need 8 solid-state DC outputs (3A) for larger main fans.

  • You also need 4 high-current mechanical relay outputs (5A) for auxiliary devices.

  • You require both thermocouple and RTD inputs (12 total channels).

  • You require RTD fault detection for sensor integrity monitoring.

  • You do not require tachometer feedback.

  • You have a climate-controlled environment (0°C to +60°C).

• Choose the DS3800NPIA if: You need tachometer feedback with the same outputs.

• Choose the DS3800NPOC if: You need 8 thermocouple inputs without RTDs or tachometer feedback.

Critical Precautions

• ESD Protection: Always wear a grounded wrist strap.

• DC Polarity (SS): Solid-state outputs are DC-only and polarity-sensitive—reverse polarity destroys the MOSFET.

• SS Voltage Limit: Do not exceed 48VDC—AC voltages cause catastrophic failure.

• SS Current Limitation: Rated at 3A continuous. Verify fan current does not exceed this limit.

• High-Voltage/Current Hazard (Relay): Relay outputs switch 115VAC/5A—lethal. Use proper insulation.

• Relay Inductive Derating: For inductive loads, derate from 5A to 3.5A or use RC snubbers.

• RTD Wiring: Use 3-wire Pt100 RTDs. All three wires must be connected. Open/short circuits trigger RTD Fault LED.

• RTD Lead Resistance: Use wire with resistance ≤10Ω per lead for accurate measurements.

• Missing T/C Channels: Only 4 thermocouple inputs (channels 1–4). Channels 5–8 are physically absent.

• No Tachometer Inputs: Do not connect speed sensors.

• No Hot-Swap: Always depower the rack before insertion/removal.

• Slot Assignment: Install in slots 8–10 (auxiliary I/O).

• CPU Dependency: If backplane communication is lost, the board defaults to 100% fan speed—RTD fault detection disabled in fallback mode.

• Firmware Compatibility: The DS3800NPPB is compatible with Mark V CPU firmware v4.0 and above for full RTD support. For v3.x, RTD inputs may be partially disabled—confirm compatibility before purchasing.