GE DS3800NPSP

Technical Parameters

Critical note: The DS3800NPSP is a high-efficiency, low-ripple power board designed for sensitive analog and communication applications. It is not a high-current main rack supply (use NPSJ) nor a multi-output field supply (use NPSM). Hot-swapping is not supported.

Key Features & Advantages

• High Efficiency (87%) – The PWM design of the DS3800NPSP minimizes heat dissipation, making it suitable for densely packed cabinets with limited cooling.

• Ultra-Low Output Ripple – With < 15mVpp on the +5V rail and < 10mVpp on ±15V rails, the DS3800NPSP delivers exceptional power quality, ideal for sensitive analog measurement circuits and high-speed communication modules.

• Excellent Regulation – Load regulation of ±0.2% and line regulation of ±0.1% ensure stable output voltages even with varying input conditions or load changes.

• Full Isolation – 1.5kV isolation protects sensitive circuits from ground loops and transients, while the 2.0kV output-to-ground rating ensures safety and reliability.

• Fast Transient Response – Recovery time from 50% load step is under 30μs, making the DS3800NPSP suitable for loads with rapid current fluctuations (e.g., communication transceivers).

• Compact Single-Slot Design – Occupies only 4HP, ideal for space-constrained cabinets.

• Direct Drop-In for Instrumentation Racks – Compatible with standard Mark IV/V backplanes in 4HP slots.

Typical Application Cases

• Analog Signal Conditioning Racks – Provides clean, regulated power to analog isolators, transducers, and signal converters in turbine control systems.

• Communication Interface Panels – Powers serial communication modules, fiber optic transceivers, and protocol gateways requiring low-ripple, stable power.

• Instrumentation Cabinets – Supplies power to precision field instruments (pressure transmitters, temperature sensors) where power quality directly affects measurement accuracy.

• Test and Calibration Equipment – Used in laboratory environments for control algorithm validation where high-quality power is essential for accurate measurements.

• Retrofit Power Upgrades – Replaces aging power supplies in legacy cabinets with a high-efficiency, low-ripple solution.

Competitive Comparison

The DS3800NPSP is the premium low-ripple power board in the DS3800 family, offering exceptional power quality for sensitive instrumentation and communication applications.

Selection Guidelines & Precautions

1. Application Verification – The DS3800NPSP is designed for sensitive analog and communication applications where power quality is critical. If your application is standard I/O logic with less stringent requirements, NPSE or NPSK boards may be more cost-effective.

2. Power Budget – Calculate total current draw:

   • +5V: max 8A

   • ±15V: max 1.5A each

   • +24V: max 1A
     Exceeding any output will trigger overcurrent protection and latch that output off.

3. Grounding for Full Isolation – To maintain isolation, use separate returns:

   • OUT_GND (+5V and ±15V return) → Rack logic ground

   • 24V_ISO_GND (+24V return) → Field device common
     Using a common ground defeats the isolation barrier.

4. Input Power Sizing – At full load, input current at 100VDC is approximately 2.5A. Use a 6A slow-blow circuit breaker and cable gauge ≥ 2.5mm².

5. Thermal Derating – Full output available up to 55°C:

   • 55°C–60°C: derate all outputs to 90% of rated current

   • 60°C–65°C: derate all outputs to 80% of rated current

   • Above 65°C: do not operate

6. Compatibility – The DS3800NPSP is pin-compatible with all Mark IV backplanes in 4HP slots. No backplane modifications are required.

7. Spare Sourcing – Production ended in 2015. When purchasing refurbished units, request a load test report verifying output ripple < 15mVpp (+5V) at full load and < 10mVpp (±15V). Visually inspect for capacitor bulging, discoloration, or burned traces. The DS3800NPSP is ideal for instrumentation and communication applications—do not use it as a main rack power supply (use NPSJ) or high-current field supply (use NPSL).