Description
Technical Parameters
| Parameter | Specification |
|---|---|
| Input Voltage | 125 VDC nominal (range 100–150 VDC); 24 VDC compatible with external adapter |
| Output Rails | +5 VDC / 5A (precision logic), ±15 VDC / 1A (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 |
| Communication Interface | RS‑485/Modbus interface for external device communication; communicates with main CPU via backplane |
| Diagnostic Features | Onboard diagnostic engine for power supply health monitoring; event logging (1,000‑event buffer) |
| Monitoring | 4 analog feedback channels (voltage and current monitoring for outputs); 2 digital fault outputs (relay, 24V/0.5A) for system faults and diagnostic alerts |
| Digital Interface | 2 digital inputs for external control; 4 digital outputs for status indication |
| 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 |
| Status LEDs | 6 indicators: INPUT OK (green), OUTPUT OK (green), SYSTEM OK (green), FAULT (red), COMM ACTIVE (white), DIAGNOSTIC ALERT (orange) |
| Certifications | CE, UL 508 (non‑hazardous locations only) |
| Efficiency | ~76% at full load |
Critical note: The DS3800NTCD1A1A is the baseline temperature‑compensated power board with communications and diagnostics. 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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Precision Temperature Compensation – Maintains temperature coefficient of < 50 ppm/°C.
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Communication Interface – RS‑485/Modbus for external device communication.
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Diagnostic Engine – Onboard diagnostics for power supply health monitoring.
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Event Logging – 1,000‑event buffer for failure analysis.
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Exceptional Regulation – Load regulation of ±0.05% and line regulation of ±0.02%.
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Full Isolation – 1.5kV isolation protects sensitive circuits.
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Two Fault Relays – Separate fault indication for system faults and diagnostic alerts.
Typical Application Cases
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Instrumentation Cabinets – Powers precision instruments requiring temperature stability and communication.
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Calibration Laboratories – Supplies power to calibration equipment with diagnostic monitoring.
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High‑Precision Measurement Systems – Powers vibration analysis and other critical measurement systems.
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Legacy Fleet Replacement – Baseline replacement for failed NTCD units in older Mark IV systems.
Competitive Comparison
| Aspect | DS3800NTCD1A1A (GE) | DS3800NTCD (later revision) | DS3800NPTA1E1B (GE) |
|---|---|---|---|
| +5V Output | 5A | 6A | 8A |
| ±15V Output | 1A each | 1.5A each | 2A each |
| Communication | Yes (RS‑485) | Yes | No |
| Price (refurb) | ~$3,800–$5,500 | ~$4,200–$6,000 | ~$3,800–$5,200 |
Selection Guidelines & Precautions
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Application Verification – Designed for precision instrumentation with communication and diagnostics.
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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 RS‑485/Modbus parameters via backplane communication using GE Service Tool Software.
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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.
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Spare Sourcing – Production ended in 2005. Request test report verifying outputs, communication functions, and temperature stability. Inspect for capacitor bulging or discoloration. Consider upgrading to later NTCD revisions for higher capacity.
REXROTH R900021396
Notifier FCM-1C
SCHNEIDER 140XTS00200
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