Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 85–165 VDC); 24 VDC compatible with external adapter |
| Output Rails | Main Output: 5–24 VDC / 10A (adjustable), +5 VDC / 4A (logic), ±15 VDC / 1.5A (each rail, analog) |
| 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: ±0.25%; Line regulation: ±0.12%; Ripple: < 15mVpp (main), < 10mVpp (±15V) |
| Adjustment Range | Main output adjustable 5–24 VDC via onboard potentiometer |
| Monitoring | 8 analog feedback channels (voltage and current monitoring for main output, +5V, ±15V, and input); 8 digital fault outputs (relay, 24V/2A) for system faults and diagnostic alerts |
| Diagnostic Features | Onboard diagnostic engine for power supply health monitoring; predictive failure indicators (capacitor ESR, MOSFET health); event logging (5,000‑event buffer) |
| Digital Interface | 8 digital inputs for external control; 10 digital outputs for status indication |
| Communication Interface | RS‑485/Modbus and Ethernet/Modbus TCP for external device communication; 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 |
| Status LEDs | 12 indicators: INPUT OK (green), OUTPUT OK (green), SYSTEM OK (green), FAULT (red), ADJUST ACTIVE (blue), AUX OK (green), DIAGNOSTIC ALERT (orange), OVERTEMP (yellow), PREDICTIVE ALERT (purple), COMM ACTIVE (white), SECURE COMM (green flash), LOAD SHED ACTIVE (amber) |
| Certifications | CE, UL 508, CSA Class I Div 2, IEC 61508 SIL 3 (TÜV‑certified), IEC 62443‑3‑3 (cybersecurity) |
| Efficiency | ~82% at full load |
Critical note: The DS3800NVCD1C1C is functionally identical to the 1B1B. The revision letter “C” primarily reflects alternative component suppliers to mitigate obsolescence. Performance specifications remain unchanged. It 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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Adjustable Main Output – 5–24 VDC adjustable via onboard potentiometer.
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Highest Capacity – Main output at 10A, +5V at 4A, and ±15V at 1.5A—highest in the NVCD family.
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Secure Communication – RS‑485/Modbus and Ethernet/Modbus TCP with TLS; cybersecurity per IEC 62443‑3‑3.
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Predictive Analytics – Monitors capacitor ESR and MOSFET health; purple LED warns before failure.
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Event Logging – 5,000‑event buffer for failure analysis.
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SIL 3 Certification – Highest functional safety level.
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Updated Component Selection – Uses currently available components for better long‑term availability.
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Direct Drop‑In Replacement – Pin‑compatible with all 6HP Mark IV/V backplanes, fully interchangeable with 1B1B and earlier NVCD boards.
Typical Application Cases
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Auxiliary Control Cabinets – Flexible voltage conversion with diagnostics.
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Test Equipment – Adjustable voltage with health monitoring.
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Field Device Power Distribution – Powers devices with varying voltage requirements.
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Safety‑Related Systems – SIL 3 for critical safety applications.
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System Integration Projects – Requires adjustable voltage, diagnostics, secure communication, and SIL 3.
Competitive Comparison
| Aspect | DS3800NVCD1C1C (GE) | DS3800NVCD1B1B (GE) | Generic Adjustable Supply |
|---|---|---|---|
| Main Output | 5–24V / 10A | 5–24V / 10A | Varies |
| Communication | RS‑485 + Ethernet | RS‑485 + Ethernet | Varies |
| SIL 3 | Yes | Yes | Varies |
| Component Availability | Best | Good | Varies |
| Price (refurb) | ~$7,500–$11,000 | ~$7,500–$11,000 | ~$200–$800 |
The DS3800NVCD1C1C offers no functional advantage over the 1B1B but provides better long‑term availability.
Selection Guidelines & Precautions
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Application – For flexible voltage conversion with adjustable output, diagnostics, secure communication, and SIL 3.
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Physical – 6HP wide, requires 1.5 adjacent slots.
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Backplane – Uses P1 and P2. If P2 missing, auxiliary/communication features unavailable.
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Voltage Adjustment – Adjust main output via onboard potentiometer; calibrate with precision voltmeter.
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Communication – Configure RS‑485 and Ethernet/TLS via GE Service Tool Software.
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Cybersecurity – Change default passwords, disable unused services per IEC 62443‑3‑3.
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Thermal – Full output to 60°C; derate to 90% at 60–65°C, 80% at 65–70°C. Do not exceed 70°C.
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SIL 3 – Follow GE safety manual GEI‑101165 for installation and proof‑test intervals.
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Spare Sourcing – Production ended 2022. Request test report verifying outputs, adjustment, diagnostics, predictive analytics, and communication. Inspect for capacitor bulging or discoloration. The DS3800NVCD1C1C is the preferred revision for new spares—prioritize this over 1B1B or earlier revisions when available.
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