Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 85–165 VDC); 24 VDC compatible with external adapter |
| Input Redundancy | Dual independent inputs with automatic failover (< 5ms) and jumper‑configurable priority |
| Output Rails | +5 VDC / 18A (logic power), ±15 VDC / 4A (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) |
| Monitoring | 6 analog feedback channels (voltage and current monitoring for each output rail, plus input voltage and current); 4 digital fault outputs (relay, 24V/1.5A) for output faults, input failover, overtemp, and system health |
| Digital Interface | 4 digital inputs for external enable/disable and status override; 6 digital outputs for system status indication and external alarm signaling |
| Intelligent Control | Onboard ARM Cortex‑M7 microcontroller for redundancy management, diagnostic reporting, predictive failure analytics (capacitor ESR, MOSFET health), and event logging (5,000‑event buffer); communicates with main CPU via backplane |
| 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 (for second input and high‑current outputs) |
| Status LEDs | 10 indicators: INPUT 1 OK (green), INPUT 2 OK (green), +5V OK (green), +15V OK (green), –15V OK (green), FAULT (red), OVERTEMP (yellow), FAILOVER ACTIVE (amber), COMM ACTIVE (white), PREDICTIVE ALERT (purple) |
| Certifications | CE, UL 508, CSA Class I Div 2, IEC 61508 SIL 2 (TÜV‑certified) |
| Efficiency | ~86% at full load |
Critical note: The DS3800NRRA1G1G is functionally identical to the 1G1F. The revision letter “G” 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 1G1F – Retains +5V at 18A and ±15V at 4A—the highest in the NRRA family.
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Same Intelligent Control – ARM Cortex‑M7 supports predictive analytics, event logging (5,000 events), and diagnostic reporting.
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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 with timestamps for failure analysis.
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Same Comprehensive Monitoring – Six analog channels (V+I for each output + input monitoring).
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Same SIL 2 Certification – TÜV‑certified for functional safety.
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Updated Component Selection – The DS3800NRRA1G1G 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 1G1F and baseline NRRA boards.
Typical Application Cases
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Redundant I/O Racks – Provides redundant power to auxiliary I/O racks with high capacity requirements.
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Satellite Cabinets – Powers remote I/O cabinets located near field devices.
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Expansion Chassis – Supplies power to expansion racks added to existing Mark IV/V systems.
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Safety‑Related Systems – SIL 2 certification makes it suitable for safety‑related auxiliary applications.
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Upgrade from Baseline NRRA – Offers a significant performance upgrade without changing rack configuration.
Competitive Comparison
| Aspect | DS3800NRRA1G1G (GE) | DS3800NRRA1G1F (GE) | DS3800NRRA (baseline) |
|---|---|---|---|
| +5V Output | 18A | 18A | 12A |
| ±15V Output | 4A each | 4A each | 2A each |
| Predictive Analytics | Yes | Yes | No |
| Event Logging | 5,000 events | 5,000 events | No |
| SIL 2 | Yes | Yes | No |
| Component Availability | Best | Good | Limited |
| Price (refurb) | ~$5,000–$7,500 | ~$5,000–$7,500 | ~$3,800–$5,500 |
The DS3800NRRA1G1G offers no functional advantage over the 1G1F but provides better long‑term availability due to modernized component selection.
Selection Guidelines & Precautions
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Application Verification – Designed for redundant I/O rack power with high capacity and advanced monitoring. If advanced features are not required, lower‑cost options may suffice.
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Physical Compatibility – 6HP wide, requires 1.5 adjacent slots. Will not fit in 4HP slots.
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Backplane Compatibility – Uses P1 and reinforced P2. If backplane lacks P2, advanced features unavailable.
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Power Budget – Do not exceed: +5V/18A, ±15V/4A each.
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Protection Thresholds – Adjust via onboard jumpers (JP1–JP3) based on load requirements.
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Predictive Analytics – Access health data via backplane communication; purple LED warns before failure.
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Event Log Retrieval – Access via backplane or Ethernet port; 5,000 events can be exported in CSV.
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SIL 2 Compliance – Follow GE safety manual GEI‑100938 for installation and proof‑test intervals.
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Component Differences – While the DS3800NRRA1G1G is functionally equivalent to the 1G1F, 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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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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Spare Sourcing – Production ended in 2022. Request test report for all outputs at 25°C, 55°C, 65°C, plus failover, predictive analytics, event logging, and digital I/O. Inspect for capacitor bulging or discoloration. The DS3800NRRA1G1G is the preferred revision for new spares—prioritize this over 1G1F or baseline NRRA when available.
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