531X122PCNALG2 | GE Mark V 1600W Power Supply

  • Model: 531X122PCNALG2
  • 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 (195ms); 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 531X122PCNALG2 is the ultimate power supply for the Mark V system—delivering the absolute highest hold-up time (195ms) of any Mark V power supply ever produced. With the full suite of diagnostic capabilities, it’s the supply you install when power continuity is the single most critical factor in your turbine control system.

Compared to the 531X122PCNALG1, the “G2” revision extends hold-up from 190ms to 195ms and reduces inrush current from 23A to 22A. 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) 22A 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 195 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
531X122PCNALG2 ✅ Drop-in Replacement Target model. No changes.
531X122PCNALG1 ✅ Drop-in Replacement 190ms hold-up, 23A inrush. Direct swap.
531X122PCNALG ✅ Drop-in Replacement Original revision—0.95 PFC, 50ms hold-up, no diagnostics. Direct swap.
531X122PCNAKG1 ✅ Drop-in Replacement 180ms hold-up, 10,000-event log. Direct swap—the NALG2 has longer hold-up.
531X121PCRALG1 ✅ Drop-in Replacement 190ms hold-up, 10,000-event log. Direct swap—the NALG2 has longer hold-up.
531X121PCRALG2 ✅ Drop-in Replacement 190ms hold-up, 10,000-event log. Direct swap—the NALG2 has longer hold-up.
DS3800NPSA ❌ Hardware Incompatible Mark IV supply—different form factor.

 

Frequently Asked Questions (FAQ)

Q: What’s the difference between the NALG2 and the NALG1?
The NALG2 has longer hold-up (195ms vs. 190ms) and lower inrush (22A vs. 23A). It represents the absolute peak of Mark V power supply performance. If you need the maximum hold-up time available for the Mark V system, this is the supply you want.

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 NALG2 supplies in parallel for redundancy?
Yes—the NALG2 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 NALG2 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 NALG2?
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.

BENTLY 330851-02-000-070-10-00-05
PTM PSMU-350-3
ABB 3AFE61320946P0001
Kollmorgen CB06560

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