531X128HMSADG2 | Replace 531X128HMSADG1

  • Model: 531X128HMSADG2
  • 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 diagnostic data logging.
  • Product Type: Power Supply / Rack PSU
  • Key Specs: 1600W output; 24 VDC @ 66.6A; active PFC >0.99; hold-up (155ms); modular fan cartridge; hardware load-sharing; remote sense; RS-485 diagnostics; 7500-event data log; USB download.
  • Condition: New Surplus / Factory Sealed (verify stock on quote).
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Description

 

Product Introduction

The 531X128HMSADG2 is a high-capacity power supply for the most demanding Mark V rack configurations, delivering 1600W with a comprehensive feature set including load-sharing, remote sensing, diagnostic data logging, and USB log download. It’s built for critical turbine applications where every amp counts and power continuity is essential.

Compared to the 531X128HMSADG1, the “G2” revision extends hold-up from 150ms to 155ms, expands data logging memory from 5000 to 7500 events, and reduces inrush current from 28A to 27A. The ripple and noise was also improved from <70mV to <65mV. 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) 27A 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 155 ms @ full load
Ripple & Noise < 65 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 7500 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
531X128HMSADG2 ✅ Drop-in Replacement Target model. No changes.
531X128HMSADG1 ✅ Drop-in Replacement 150ms hold-up, 5000-event log. Direct swap.
531X128HMSADG ✅ Drop-in Replacement 150ms hold-up, 5000-event log. Direct swap—the HMSADG2 has longer hold-up and larger log.
531X128HMSACG2 ✅ Drop-in Replacement 148ms hold-up, 3000-event log. Direct swap—the HMSADG2 has longer hold-up and larger log.
531X128HMSAEG ✅ Drop-in Replacement 155ms hold-up, 7500-event log. Direct swap—equivalent spec.
531X128HMSAFG ✅ Drop-in Replacement 160ms hold-up, 10,000-event log. Direct swap—upgrade.
DS3800NPSA ❌ Hardware Incompatible Mark IV supply—different form factor.

 

Frequently Asked Questions (FAQ)

Q: What’s the difference between the HMSADG2 and the HMSAEG?
Both deliver 1600W with 155ms hold-up and 7500-event logs. They are essentially equivalent—different part numbers reflect different manufacturing batches or component sourcing variations. Functionally, they are direct replacements for each other.

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 HMSADG2 supplies in parallel for redundancy?
Yes—the HMSADG2 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%.

Q: Can I hot-swap the HMSADG2 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 HMSADG2?
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.

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.

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