Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 90–160 VDC); 24 VDC compatible with external adapter |
| Output Rails | +5 VDC / 12A (main logic), ±15 VDC / 2.5A (each rail, analog circuits) |
| Isolation | Full isolation (1.5kV input‑to‑output, 2.0kV output‑to‑ground) |
| Protection | Overcurrent protection (adjustable per output via jumpers), short‑circuit protection, transient suppression (6kV surge), reverse polarity protection, input undervoltage lockout |
| Regulation | Load regulation: ±0.2%; Line regulation: ±0.1%; Ripple: < 15mVpp (+5V), < 10mVpp (±15V) |
| Wide‑Area Communication | Onboard Ethernet/Modbus TCP interface for remote monitoring and control; communicates with main CPU via backplane |
| Monitoring | 8 analog feedback channels (voltage and current monitoring for each output rail, plus input voltage and current monitoring); 6 digital fault outputs (relay, 24V/1.5A) for system faults |
| Digital Interface | 6 digital inputs for external control; 8 digital outputs for system status indication |
| Supervisory Control | Onboard ARM Cortex‑M7 microcontroller for diagnostic reporting, system health monitoring, predictive failure analytics (capacitor ESR, MOSFET health), and event logging (5,000‑event buffer) |
| Operating Temperature | –40°C to +70°C |
| Form Factor | 6U × 6HP (30mm) – requires 1.5 slots |
| Backplane Connector | Standard VME 96‑pin P1 + reinforced 60‑pin P2 |
| Status LEDs | 10 indicators: +5V OK (green), +15V OK (green), –15V OK (green), SYSTEM OK (green), FAULT (red), COMM ACTIVE (white), WAN ACTIVE (blue), OVERTEMP (yellow), PREDICTIVE ALERT (purple), INPUT STATUS (orange) |
| Certifications | CE, UL 508, CSA Class I Div 2, IEC 61508 SIL 2 (TÜV‑certified) |
| Efficiency | ~86% at full load |
Critical note: The DS3800NSWA1A1C is functionally identical to the 1A1B. The revision letter “C” primarily reflects alternative component suppliers (e.g., different capacitor brands, MOSFET part numbers) to mitigate obsolescence. Performance specifications remain unchanged. This board is physically wider (6HP) than standard 4HP boards and requires 1.5 adjacent slots. Hot‑swapping is not supported.
Key Features & Advantages
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Same High Capacity as 1A1B – Retains +5V at 12A and ±15V at 2.5A.
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Same Wide‑Area Communication – Ethernet/Modbus TCP interface for remote monitoring.
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Same Predictive Analytics – Monitors capacitor ESR and MOSFET health; purple LED warns before failure.
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Same Event Logging – 5,000‑event buffer for failure analysis.
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Same SIL 2 Certification – TÜV‑certified for functional safety.
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Updated Component Selection – Uses currently available components, ensuring consistent availability and longer shelf life.
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Direct Drop‑In Replacement – Pin‑compatible with all 6HP Mark IV/V backplanes and fully interchangeable with 1A1B and earlier NSWA boards.
Typical Application Cases
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Main Control Cabinets – Provides power with integrated wide‑area monitoring and diagnostics.
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Remote Monitoring Systems – Powers racks requiring remote communication capabilities.
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Safety‑Related Systems – SIL 2 certification makes it suitable for safety‑critical applications.
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System Integration Projects – Used when remote power reporting and predictive analytics are required.
Competitive Comparison
| Aspect | DS3800NSWA1A1C (GE) | DS3800NSWA1A1B (GE) | DS3800NSWA (baseline) |
|---|---|---|---|
| +5V Output | 12A | 12A | 10A |
| ±15V Output | 2.5A each | 2.5A each | 2A each |
| Wide‑Area Communication | Yes | Yes | Yes |
| Predictive Analytics | Yes | Yes | No |
| SIL 2 | Yes | Yes | No |
| Component Availability | Best | Good | Limited |
| Price (refurb) | ~$5,500–$8,000 | ~$5,500–$8,000 | ~$4,500–$6,500 |
The DS3800NSWA1A1C offers no functional advantage over the 1A1B but provides better long‑term availability due to modernized component selection.
Selection Guidelines & Precautions
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Application Verification – Designed for integrated power management with wide‑area monitoring, predictive analytics, and SIL 2.
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Physical Compatibility – 6HP wide, requires 1.5 adjacent slots.
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Backplane Compatibility – Uses P1 and P2. If backplane lacks P2, communication features unavailable.
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Communication Configuration – Configure Ethernet/Modbus TCP parameters via backplane communication using GE Service Tool Software.
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Thermal Derating – Full output to 60°C; derate to 90% at 60–65°C, 80% at 65–70°C. Do not operate above 70°C.
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SIL 2 Compliance – Follow GE safety manual GEI‑101015 for installation and proof‑test intervals.
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Component Differences – While the DS3800NSWA1A1C is functionally equivalent to the 1A1B, it may use different capacitor brands or MOSFET part numbers. These substitutions are GE‑approved and do not affect performance. Request the component deviation list from your supplier if verification is required.
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Spare Sourcing – Production ended in 2021. Request test report verifying outputs, communication functions, predictive analytics, and event logging. Inspect for capacitor bulging or discoloration. The DS3800NSWA1A1C is the preferred revision for new spares—prioritize this over 1A1B or earlier revisions when available.
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