531X122PCNAKG1 | Replace 531X122PCNAKG Direct

  • Model: 531X122PCNAKG1
  • Brand: General Electric (GE)
  • Series: Mark V / Mark V Speedtronic
  • Core Function: High-capacity power supply for the Mark V system with comprehensive monitoring, remote sensing, and enhanced diagnostic data logging.
  • Product Type: Power Supply / Rack PSU
  • Key Specs: 1600W output; 24 VDC @ 66.6A; active PFC >0.99; hold-up (180ms); modular fan cartridge; hardware load-sharing; remote sense; RS-485 diagnostics; 10,000-event data log; USB download.
  • Condition: New Surplus / Factory Sealed (verify stock on quote).
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Description

 

Product Introduction

The 531X122PCNAKG1 is a flagship power supply for the Mark V system, delivering 1600W with the longest hold-up time (180ms) and the most comprehensive feature set available in the 122 series. It’s built for critical turbine applications where power continuity is paramount.

Compared to the 531X122PCNAKG (non-1 revision), the “G1” version adds active power factor correction (upgraded from 0.95 to >0.99), extended hold-up from 50ms to 180ms, a modular fan cartridge with ball-bearing fans, and diagnostic data logging with USB download. The terminal assignment is identical—direct drop-in. No firmware changes required.

 

Key Technical Specifications

Parameter Value / Range
AC Input Voltage 200–240 VAC ±10% (no 120V operation)
Input Frequency 47–63 Hz
Input Current (Max) 9.0 A @ 240VAC
Power Factor >0.99 (active PFC)
Inrush Current (Cold Start) 24A peak @ 240VAC
DC Output Voltage 24 VDC ±1% (fixed)
Remote Sense Compensation Up to 2.5V drop (adjustable)
Output Current (Continuous) 66.6 A (1600W)
Output Current (Peak, 10s) 80.0 A
Hold-up Time 180 ms @ full load
Ripple & Noise < 50 mV p-p
Efficiency 96% typical
Protections Overvoltage, overcurrent, overtemperature, short-circuit
Redundancy Parallel operation with OR-ing diodes + hardware load-sharing
Load-Sharing Accuracy ±1%
Diagnostic Output RS-485 (Modbus RTU) – 30+ registers
Data Logging 10,000 fault events (time-stamped)
Log Download USB Type B
Status Indicators DC OK, Fault, Overload, Fan, Load Share, Remote Sense, Diagnostic, Data Log Full, USB Active
Cooling Modular fan cartridge (dual 92mm ball-bearing fans, 50 CFM)
Fan Replacement Swap entire cartridge—no individual fan replacement
Termination Screw terminal (input) + 24-pin backplane + 2-pin remote sense + 3-pin RS-485 + USB Type B
Operating Temp 0°C to +60°C
Dimensions 280 x 120 x 85 mm

 

Compatible Replacement Models

Model Classification Notes
531X122PCNAKG1 ✅ Drop-in Replacement Target model. No changes.
531X122PCNAKG ✅ Drop-in Replacement Original revision—0.95 PFC, 50ms hold-up, no diagnostics. Direct swap.
531X122PCNAHG1 ✅ Drop-in Replacement 1600W, 160ms hold-up, 10,000-event log. Direct swap—the NAKG1 has longer hold-up.
531X122PCNAEG1 ✅ Drop-in Replacement 1600W, 150ms hold-up, 5000-event log. Direct swap—the NAKG1 has longer hold-up and larger log.
531X122PCNACG1 ✅ Drop-in Replacement 1600W, 145ms hold-up, 2000-event log. Direct swap—the NAKG1 has longer hold-up and larger log.
531X121PCRAKG1 ✅ Drop-in Replacement 1600W, 180ms hold-up, 10,000-event log. Direct swap—equivalent spec.
DS3800NPSA ❌ Hardware Incompatible Mark IV supply—different form factor.

 

Frequently Asked Questions (FAQ)

Q: What’s the difference between the NAKG1 and the NAHG1?
The NAKG1 has longer hold-up (180ms vs. 160ms), lower inrush (24A vs. 26A), and better ripple and noise (<50mV vs. <60mV). The NAKG1 is the top-spec version of the 122 series—it offers the highest performance available in this family. If hold-up time is your primary concern, the NAKG1 is the best choice.

Q: The Fault LED is red, but the DC OK LED is green. What’s happening?
Green DC OK means the 24V output is within spec. Red Fault indicates an internal warning—typically overtemperature (fan failure) or input voltage out of range. The data logger captures the fault, and the USB port allows quick log download for analysis.

Q: Can I run two NAKG1 supplies in parallel for redundancy?
Yes—the NAKG1 has OR-ing diodes and hardware load-sharing. Connect DC outputs together (+24V to +24V, 0V to 0V), connect load-share signal terminals together, connect remote sense terminals together, connect RS-485 terminals together (daisy-chain), and feed AC inputs from separate breakers. The supplies share the load within ±1%. Each supply has its own data log.

Q: Can I hot-swap the NAKG1 while the rack is powered?
Yes, in redundant configurations (two supplies in parallel). In a single-supply config, pulling the supply shuts down the rack. If redundant, verify the OR-ing diodes are present before pulling one.

Q: What’s the expected lifespan of the NAKG1?
The electrolytic capacitors are rated for 12,000 hours at 85°C. In a 40°C cabinet, the lifespan extends to about 18-22 years. The modular fan cartridge with dual ball-bearing fans is rated for 80,000 hours at 40°C (about 9.1 years). Replace the fan cartridge every 5-7 years proactively.

Q: What’s the lead time for a surplus unit?
We keep 2-3 units in stock. Domestic: 2-3 business days ground, overnight if ordered by 2 PM EST. International: 5-7 days via DHL, with customs potentially adding 1-3 days. We include a GE certificate of origin and commercial invoice with every shipment. Contact us if you need expedited shipping.

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