Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 100–150 VDC); 24 VDC compatible with external adapter |
| Input Redundancy | Dual independent inputs with automatic failover (diode‑ORed, fixed priority) |
| Output Rails | +5 VDC / 8A (precision logic), ±15 VDC / 2A (each rail, precision analog) |
| Isolation | Full isolation (1.5kV input‑to‑output, 2.0kV output‑to‑ground) |
| Protection | Overcurrent protection (fixed), short‑circuit protection, transient suppression (4kV), reverse polarity protection, input undervoltage lockout |
| Regulation | Load regulation: ±0.05%; Line regulation: ±0.02%; Temperature coefficient: < 50 ppm/°C |
| Ripple | < 5mVpp (+5V), < 3mVpp (±15V) |
| Temperature Compensation | Active temperature compensation using precision reference ICs and thermistor‑based feedback networks |
| Monitoring | 2 analog feedback channels (voltage monitoring for +5V and +15V); 1 digital fault output (open‑collector) for output faults |
| Operating Temperature | –25°C to +60°C |
| Form Factor | 6U × 6HP (30mm) – requires 1.5 slots |
| Backplane Connector | Standard VME 96‑pin P1 + reinforced 60‑pin P2 (for second input) |
| Status LEDs | 5 indicators: INPUT 1 OK (green), INPUT 2 OK (green), OUTPUT OK (green), FAULT (red), TEMP COMP ACTIVE (blue) |
| Certifications | CE, UL 508 (non‑hazardous locations only) |
| Efficiency | ~80% at full load |
Critical note: The DS3800NRTC1A1A is the baseline redundant temperature‑compensated power board in the NRTC family. It offers higher capacity than NRTB1A1A (8A vs. 6A +5V). 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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Redundant Input + Temperature Compensation – Combines dual input failover with active temperature compensation for precision applications.
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Precision Temperature Compensation – Maintains temperature coefficient of < 50 ppm/°C.
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Exceptional Regulation – Load regulation of ±0.05% and line regulation of ±0.02%.
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Dual Input Redundancy – Automatic failover ensures uninterrupted power to critical instrumentation.
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Higher Capacity – +5V at 8A and ±15V at 2A—higher than NRTB1A1A.
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Full Isolation – 1.5kV isolation protects sensitive circuits from ground loops and transients.
Typical Application Cases
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Critical Instrumentation Cabinets – Powers precision instruments requiring both power continuity and temperature stability with moderate capacity demands.
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Calibration Laboratories – Supplies power to calibration equipment requiring stable, low‑drift power with redundancy.
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High‑Precision Measurement Systems – Powers vibration analysis, temperature monitoring, and other critical measurement systems.
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Legacy Fleet Replacement – Baseline replacement for failed NRTC units in older Mark IV systems.
Competitive Comparison
| Aspect | DS3800NRTC1A1A (GE) | DS3800NRTC (later revision) | DS3800NRTB1A1A (GE) |
|---|---|---|---|
| Input Redundancy | Yes (fixed priority) | Yes (configurable) | Yes (fixed priority) |
| Temperature Coefficient | < 50 ppm/°C | < 20 ppm/°C | < 50 ppm/°C |
| +5V Output | 8A | 10A | 6A |
| ±15V Output | 2A each | 3A each | 1.5A each |
| Price (refurb) | ~$4,200–$6,000 | ~$5,500–$8,000 | ~$3,800–$5,500 |
Selection Guidelines & Precautions
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Application Verification – Designed for precision instrumentation requiring both redundancy and temperature stability.
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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, redundancy unavailable.
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Temperature Compensation – Requires 30‑minute warm‑up to achieve specified temperature coefficient.
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Thermal Derating – Full output to 50°C; derate to 90% at 50–55°C, 80% at 55–60°C. Do not operate above 60°C.
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Spare Sourcing – Production ended in 2010. Request test report verifying outputs, failover, and temperature stability. Inspect for capacitor bulging or discoloration. Consider upgrading to later NRTC revisions for lower temperature drift (< 20 ppm/°C) and higher capacity.
A-B 1756-BA2
SCHNEIDER 140XTS00200
A-B 1794-OB16
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