GE DS3800NHVF1B1A

Key Technical Parameters

Advantages and Distinctive Features

• Hybrid Output + Tachometer Feedback: Combines 8 high-voltage DC relay outputs, 4 low-voltage solid-state outputs, AND 2 tachometer inputs on a single board.

• Improved Temperature Accuracy (16-bit ADC): ±1°C accuracy—double the precision of the base 12-bit (±2°C) model.

• Enhanced Tachometer Debounce Filtering (Revision B): Reduces false speed failure alarms caused by electrical noise or fan vibration.

• 250VDC Relay Capability: Supports high-voltage exhaust fans.

• Solid-State Auxiliary Outputs: Silent, maintenance-free switching for low-voltage circulating fans or alarms.

Typical Application Fields

• Safety-Critical High-Voltage Cooling Systems: Where fan failure must be detected immediately.

• High-Voltage Industrial Fan Systems: 220–250VDC exhaust fans with low-voltage auxiliary controls and speed monitoring.

• Railway and Traction Applications: High-voltage DC cooling with 24VDC control circuits.

• Upgrade from Base NHVF: For improved temperature accuracy and tachometer reliability.

Comparison with Related Models

Selection Recommendations

• Choose the DS3800NHVF1B1A if:

  • You need 250VDC relay outputs for high-voltage exhaust fans.

  • You also need low-voltage solid-state outputs (24–48VDC) for auxiliary fans or alarms.

  • You require tachometer feedback for fan speed verification.

  • You want improved temperature accuracy (±1°C) and enhanced tachometer filtering.

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

• Choose the DS3800NHVF1A1A if: You need the same features but do not require improved accuracy or enhanced tachometer filtering.

• Choose the DS3800NHVE1B1A if: You need the same hybrid outputs and accuracy but do not require tachometer feedback.

Critical Precautions

• ESD Protection: Always wear a grounded wrist strap.

• Extreme High-Voltage Hazard: Relay outputs switch 250VDC—lethal voltage present on terminals. Observe all high-voltage safety procedures. Use wiring rated for ≥250VDC.

• DC Polarity (Relay): Relay outputs are DC only—observe correct polarity.

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

• Tachometer Wiring: Use shielded twisted-pair cable. The enhanced debounce filtering reduces noise sensitivity, but proper grounding is still essential.

• Relay Current Limitation: Rated at 1A continuous @ 250VDC. Verify fan current does not exceed this limit.

• SS Current Limitation: Rated at 2A continuous @ 24–48VDC.

• Inductive Load Derating (Relay): Derate to 0.75A or use external RC snubbers (rated for 250VDC).

• No AC Connection: Do not connect AC loads to either output type.

• 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—tachometer monitoring disabled in fallback mode.

• Firmware Compatibility: Revision B firmware is compatible with Mark V CPU firmware v4.0 and above. For v3.x, the enhanced ADC accuracy and tachometer filtering may be partially disabled—confirm compatibility before purchasing.