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 and active load sharing between redundant sources |
| Output Rails | +5 VDC / 25A (main logic), ±15 VDC / 6A (each rail, analog circuits), +24 VDC / 4A (field/auxiliary) |
| 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 (4kV), reverse polarity protection, input undervoltage lockout |
| Regulation | Load regulation: ±0.2%; Line regulation: ±0.1%; Ripple: < 20mVpp (+5V), < 15mVpp (±15V), < 25mVpp (+24V) |
| Monitoring | 6 analog feedback channels (voltage and current monitoring for each output rail); 4 digital fault outputs (relay, 24V/1A) for individual output faults, input failover, load share errors, and system health |
| Digital Interface | 2 digital inputs for external enable/disable; 4 digital outputs for system status indication |
| Redundancy Features | Active load sharing with programmable coefficients; automatic failover detection and reporting; diagnostic heartbeat for each output rail; programmable load shedding for non‑critical outputs |
| Supervisory Control | Onboard microcontroller for redundancy management, load sharing coordination, load shedding, and diagnostic reporting; communicates with main CPU via backplane |
| Operating Temperature | –30°C to +65°C |
| Form Factor | 6U × 8HP (40mm) – requires 2 slots |
| Backplane Connector | Standard VME 96‑pin P1 + reinforced 60‑pin P2 (for second input and high‑current outputs) |
| Status LEDs | 10 indicators: +5V OK (green), +15V OK (green), –15V OK (green), +24V OK (green), SYSTEM OK (green), FAULT (red), REDUNDANCY ACTIVE (amber), LOAD SHARE ACTIVE (blue), COMM ACTIVE (white), INPUT STATUS (orange) |
| Certifications | CE, UL 508, CSA Class I Div 2 |
| Efficiency | ~85% at full load |
Critical note: The DS3800NRMA is a redundant main power interface designed for high‑availability main rack power distribution. It integrates active load sharing, supervisory control, and programmable load shedding for redundant power configurations. This board is physically wider (8HP) than standard 4HP boards and requires 2 adjacent slots. Hot‑swapping is not supported.
Key Features & Advantages
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Redundant Main Power Interface – The DS3800NRMA is designed to interface with redundant main power sources, providing power to the entire main control rack and coordinating load distribution for maximum availability.
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Active Load Sharing – The onboard microcontroller manages active load sharing with programmable coefficients, ensuring balanced power distribution between redundant sources and preventing overloading of individual supplies.
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Programmable Load Shedding – During input undervoltage or overcurrent conditions, the DS3800NRMA can shed non‑critical outputs based on configurable priority levels, preserving power for essential control circuits.
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Comprehensive Monitoring – Six analog feedback channels provide voltage and current telemetry for all output rails, enabling detailed power health monitoring and load analysis.
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Four Fault Relays – Four form‑C relay contacts (24V/1A) provide separate fault indication for each output rail, input failover, load share errors, and system health.
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Diagnostic Heartbeat – Each output rail includes a diagnostic heartbeat signal that the main CPU can monitor to detect power supply anomalies.
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Full Isolation – 1.5kV isolation protects sensitive circuits from ground loops and transients.
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Wide Temperature Range – Extended –30°C to +65°C range and CSA Div 2 certification make the DS3800NRMA suitable for demanding environments.
Typical Application Cases
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Redundant Main Control Cabinets – Installed in main racks where redundant power sources require coordinated distribution and monitoring.
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High‑Availability Turbine Control Systems – Provides power and supervisory control for critical turbine control applications requiring maximum availability.
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Frame 9E Gas Turbine Main Racks – Supports redundant power configurations in large gas turbines.
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Safety‑Related Systems – Powers main control logic in redundant safety shutdown systems.
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System Integration Projects – Used when integrating redundant power architectures with plant DCS.
Competitive Comparison
| Aspect | DS3800NRMA (GE) | DS3800NPSJ1B1C (GE) | DS3800NRCA1D1C (GE) |
|---|---|---|---|
| Redundancy Management | Yes (load sharing + shedding) | No | Yes (load sharing) |
| +5V Output | 25A | 22A | 18A |
| ±15V Output | 6A each | 4.5A each | 4A each |
| Load Shedding | Programmable | No | No |
| Form Factor | 8HP (2 slots) | 8HP (2 slots) | 6HP (1.5 slots) |
| Price (refurb) | ~$6,500–$9,000 | ~$5,500–$7,500 | ~$6,000–$8,500 |
The DS3800NRMA is the flagship redundant main power interface in the DS3800 family, offering the highest capacity, active load sharing, and programmable load shedding for high‑availability main rack applications.
Selection Guidelines & Precautions
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Application Verification – The DS3800NRMA is designed for redundant main rack power distribution. Verify that your application requires active load sharing and programmable load shedding.
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Physical Compatibility – The DS3800NRMA is 8HP wide, requiring 2 adjacent slots in your Mark IV/V rack. It will not fit in standard 4HP or 6HP slots.
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Backplane Compatibility – Uses both P1 and reinforced P2 connectors. The second input and additional I/O are provided through P2. If your backplane lacks P2, advanced features will be unavailable.
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Power Budget – Calculate total current draw:
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+5V: max 25A
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±15V: max 6A each
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+24V: max 4A
Exceeding any output will trigger overcurrent protection.
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Load Shedding Configuration – Program load shedding priority levels via backplane communication using GE Service Tool Software.
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Thermal Derating – Full output available up to 55°C:
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55°C–60°C: derate all outputs to 90% of rated current
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60°C–65°C: derate all outputs to 80% of rated current
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Above 65°C: do not operate
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Spare Sourcing – Production ended in 2015. Request a comprehensive test report verifying all outputs at rated current and functional verification of load sharing, load shedding, and fault detection. Visually inspect for capacitor bulging or discoloration.
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