531X128HMSACG2 | Replace 531X128HMSACG1

  • Model: 531X128HMSACG2
  • 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 (148ms); modular fan cartridge; hardware load-sharing; remote sense; RS-485 diagnostics; 3000-event data log; USB download.
  • Condition: New Surplus / Factory Sealed (verify stock on quote).
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Description

 

Product Introduction

The 531X128HMSACG2 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 531X128HMSACG1, the “G2” revision extends hold-up from 145ms to 148ms, expands data logging memory from 2000 to 3000 events, and reduces inrush current from 29A to 28A. 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) 28A 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 148 ms @ full load
Ripple & Noise < 70 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 3000 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
531X128HMSACG2 ✅ Drop-in Replacement Target model. No changes.
531X128HMSACG1 ✅ Drop-in Replacement 145ms hold-up, 2000-event log. Direct swap.
531X128HMSACG ✅ Drop-in Replacement Original revision—0.95 PFC, 50ms hold-up, no diagnostics. Direct swap.
531X128HMSADG1 ✅ Drop-in Replacement 150ms hold-up, 5000-event log. Direct swap—upgrade.
531X128HMSAEG1 ✅ Drop-in Replacement 155ms hold-up, 7500-event log. Direct swap—upgrade.
531X128HMSAFG1 ✅ 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 HMSACG2 and the HMSADG1?
The HMSADG1 has longer hold-up (150ms vs. 148ms), a larger data log (5000 events vs. 3000), and lower inrush (28A vs. 29A—note the HMSACG2 has 28A inrush, so the difference is minimal). The HMSADG1 is an upgrade option within the 128 series.

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 HMSACG2 supplies in parallel for redundancy?
Yes—the HMSACG2 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 HMSACG2 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 HMSACG2?
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.

GE 369-HI-R-M-0-0
A-B 1747-L553
FANUC A06B-1401-B105

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