Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 90–160 VDC); 24 VDC compatible with external adapter |
| Output Rails | Main Output: 5–24 VDC / 8A (adjustable), +5 VDC / 3A (logic), ±15 VDC / 1A (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: ±0.3%; Line regulation: ±0.15%; Ripple: < 20mVpp (main), < 15mVpp (±15V) |
| Adjustment Range | Main output adjustable 5–24 VDC via onboard potentiometer |
| Monitoring | 6 analog feedback channels (voltage and current monitoring for main output, +5V, and +15V); 6 digital fault outputs (relay, 24V/1.5A) 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 | 6 digital inputs for external control; 8 digital outputs for status indication |
| Communication Interface | RS‑485/Modbus for external device communication; communicates with main CPU via backplane |
| Operating Temperature | –30°C to +65°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: 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) |
| Certifications | CE, UL 508, CSA Class I Div 2, IEC 61508 SIL 2 (TÜV‑certified) |
| Efficiency | ~80% at full load |
Critical note: The DS3800NVCD1A1B is a variable voltage converter board with diagnostics, predictive analytics, and SIL 2 certification, offering higher capacity and enhanced features. 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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Higher Capacity – Main output at 8A, +5V at 3A, and ±15V at 1A—higher than baseline NVCD.
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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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Diagnostic Engine – Onboard diagnostics for power supply health monitoring.
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Communication Interface – RS‑485/Modbus for external device communication.
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Six Fault Relays – Separate fault indication for system faults and diagnostic alerts.
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SIL 2 Certification – TÜV‑certified for functional safety.
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Wide Temperature Range – –30°C to +65°C.
Typical Application Cases
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Auxiliary Control Cabinets – Provides flexible voltage conversion with diagnostics.
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Test Equipment – Supplies 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 2 certification makes it suitable for safety‑critical applications.
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System Integration Projects – Used when adjustable voltage, diagnostics, and SIL 2 are required.
Competitive Comparison
| Aspect | DS3800NVCD1A1B (GE) | DS3800NVCD (baseline) | Generic Adjustable Supply |
|---|---|---|---|
| Main Output | 5–24V / 8A | 5–24V / 5A | Varies |
| Predictive Analytics | Yes | No | No |
| Event Logging | 5,000 events | 2,000 events | No |
| SIL 2 | Yes | No | Varies |
| Price (refurb) | ~$5,500–$8,000 | ~$4,200–$6,000 | ~$200–$800 |
Selection Guidelines & Precautions
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Application Verification – Designed for flexible voltage conversion with adjustable output, diagnostics, 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, auxiliary features unavailable.
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Voltage Adjustment – Adjust main output via onboard potentiometer. Use precision voltmeter for calibration.
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Communication Configuration – Configure RS‑485/Modbus parameters via backplane communication using GE Service Tool Software.
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Thermal Derating – Full output to 55°C; derate to 90% at 55–60°C, 80% at 60–65°C. Do not operate above 65°C.
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SIL 2 Compliance – Follow GE safety manual GEI‑101155 for installation and proof‑test intervals.
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Spare Sourcing – Production ended in 2021. Request test report verifying outputs, adjustment range, diagnostic functions, predictive analytics, and communication. Inspect for capacitor bulging or discoloration. Prioritize this over baseline NVCD for applications requiring higher capacity and SIL 2 certification.
A-B 1756-TBNH
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A-B 1756-TBNH
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