GE DS3800NPSK1H1F

Technical Parameters

Critical note: The DS3800NPSK1H1F is a compact (4HP), non-isolated board designed for auxiliary applications only. It offers higher capacity than the baseline NPSK (10A vs. 8A) but remains significantly lower than NPSE or NPSJ series boards. Hot-swapping is not supported.

Key Features & Advantages

• Higher Capacity than Baseline NPSK – With +5V at 10A (25% more than the standard NPSK’s 8A), the DS3800NPSK1H1F can support auxiliary racks with more I/O cards or higher-power modules.

• Compact Single-Slot Design – Occupies only 4HP, making it ideal for cramped auxiliary cabinets where larger boards cannot fit.

• Improved Thermal Performance – Enhanced heatsink and PCB layout reduce hotspot temperatures by 8°C compared to baseline NPSK, extending capacitor lifetime to 10,000 hours at 65°C.

• Lower Output Ripple – Redesigned output filter reduces ripple to < 30mVpp for the +5V rail (versus < 50mVpp on baseline NPSK), benefiting sensitive analog measurement cards.

• Direct Drop-In for Auxiliary Racks – Pin-compatible with all 4HP Mark IV/V backplanes. No backplane or wiring changes required.

• Cost-Effective – More affordable than NPSE or NPSJ series boards, making it suitable for non-critical auxiliary applications.

Typical Application Cases

• Auxiliary I/O Racks – Installed in satellite cabinets for monitoring non-critical points (e.g., ambient temperature, vibration trends) where moderate power is required.

• Test Equipment and Simulators – Used in laboratory environments for control algorithm validation with moderate I/O card populations.

• Remote Panels – Powers remote I/O panels with up to 8–10 cards located near field devices.

• Upgrade from Baseline NPSK – When a standard NPSK board fails, the DS3800NPSK1H1F offers a performance upgrade without changing rack configuration.

Competitive Comparison

The DS3800NPSK1H1F is the best-performing 4HP auxiliary power board in the NPSK family, but it remains functionally limited compared to NPSE series boards with similar current ratings.

Selection Guidelines & Precautions

1. Power Budget Verification – Calculate total +5V current draw of all cards in your auxiliary rack. If it exceeds 10A (or 9A above 55°C), choose an NPSE series board (e.g., C1C) instead. Overloading will trigger OVP and latch the output off.

2. Grounding Requirements – As a non-isolated board, the DS3800NPSK1H1F demands a single-point ground (< 1Ω) for the entire cabinet. Mixing with isolated power supplies creates ground loops that degrade analog signals and may damage TVS diodes.

3. No Diagnostics – Lacks predictive failure analytics. Perform manual ESR checks on primary capacitors (C8, C12) every 6 months. Replace the board if ESR exceeds 2× initial value.

4. Thermal Derating – Full 10A output available up to 55°C:

   • 55°C – 60°C: derate +5V to 9A

   • 60°C – 65°C: derate +5V to 8A

   • Above 65°C: do not operate

5. Compatibility – The DS3800NPSK1H1F is pin-compatible with all Mark IV backplanes in 4HP slots. No backplane modifications are required.

6. Spare Sourcing – Production ended in 2015. When purchasing refurbished units, request a load test report verifying output ripple < 30mVpp at 25°C and < 50mVpp at 55°C. Visually inspect for capacitor bulging or discoloration. The DS3800NPSK1H1F is suitable for auxiliary racks only—do not attempt to use it in main racks or densely populated cabinets where NPSE or NPSJ series boards are required.