531X111PSHAAG2 | GE Factory Tested & ISO Certified

Description

Product Introduction

Every Mark V rack needs juice, and the 531X111PSHAAG2 is the factory-specified source. This board mounts in the dedicated power supply slot—usually the far left or far right—and converts incoming 120/240 VAC into the regulated 24 VDC that feeds the backplane and all the I/O modules. Without it, nothing powers up. No CPU, no I/O, no comms.

Compared to the 531X111PSHAAG (non-2 revision), the “G2” version adds a meaningful improvement: active power factor correction (PFC) was upgraded from 0.95 to 0.98, reducing harmonic distortion and improving efficiency. The hold-up time was also extended from 20ms to 25ms. The terminal assignment is identical—direct drop-in. No firmware changes required.

Key Technical Specifications

Compatible Replacement Models

Frequently Asked Questions (FAQ)

Q: What’s the difference between the PSHAAG2 and the PSHAAG?
The G2 has active power factor correction upgraded from 0.95 to 0.98—which reduces harmonic distortion and improves efficiency by about 1%. The hold-up time increased from 20ms to 25ms, giving your UPS more time to transfer. The terminal assignment is identical, so it’s a direct drop-in. If you’re on a weak grid or a generator with high impedance, the G2’s better PFC will reduce nuisance tripping of upstream breakers.

Q: Can I run two PSHAAG2 supplies in parallel for redundancy?
Yes—the board has internal OR-ing diodes, so you can parallel two units. Connect the DC outputs together (+24V to +24V, 0V to 0V) and feed the AC inputs from separate breakers or UPS feeds. Each supply will share the load roughly equally (within 5%). If one fails, the other takes the full load without a voltage drop. GE recommends a maximum of 2 supplies per rack; three will cause current hogging.

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 blocked airflow) or an input voltage out of range (below 85VAC or above 265VAC). Check the fan—it’s user-replaceable (80mm x 25mm, 12V DC). If the fan is stalled, the supply will derate and eventually shut down. The G2 has a thermal sensor that triggers the fault at 80°C.

Q: What’s the hold-up time, and why does it matter?
Hold-up time is how long the supply maintains 24V output after AC input is lost. The G2’s 25ms is enough for most UPS transfers (typical transfer time is 10-15ms). If your UPS is slow (some older units transfer in 30ms), you’ll see a momentary drop on the 24V bus—which can reset the CPU. If you’re on a weak grid, consider adding a 24V battery-backed DC bus.

Q: The 24V output measures 23.5V, not 24V. Is the supply failing?
The PSHAAG2 has a voltage adjustment pot (accessible through a small hole on the front panel). It’s set at the factory to 24.0V, but can drift over time. Use a flat-blade screwdriver to adjust it to 24.0V while measuring at the backplane connector (not at the output terminals). If you can’t get it above 23.5V, the internal reference may be drifting—time to replace the supply.

Q: The fan is loud and runs continuously. Is that normal?
The G2’s fan is temperature-controlled. At low loads (<100W), it should run at low speed (barely audible). At high loads (>200W), it ramps to full speed—which is noticeable. If it’s running at full speed at idle, the temperature sensor may be faulty or the heatsink is blocked with dust. Blow out the unit with compressed air (hold the fan blade to prevent overspeed). If the fan speed doesn’t change with load, the fan control circuit may be dead—the fan defaults to full speed as a fail-safe.

Q: The Overload LED is amber. What does that mean?
Amber Overload LED indicates the supply is drawing more than its continuous rating (10.4A). At loads between 10.4A and 12.5A, it’ll light amber and continue running—but the output voltage may droop (down to 22V). If the load exceeds 12.5A, the supply enters foldback current limiting (output drops to about 12V, and the LED flashes). Check your rack’s total load—a fully populated Mark V rack with 10 I/O modules and a CPU can draw up to 10A, so you should be fine. If you’re above 10.4A, consider adding a second supply.

Q: Can I hot-swap the PSHAAG2 while the rack is powered?
The board supports hot-swapping when used in a redundant configuration (two supplies in parallel). In a single-supply configuration, pulling the supply will immediately shut down the entire rack—a guaranteed turbine trip. If you have redundant supplies, verify the OR-ing diodes are present before pulling one.

Q: What’s the expected lifespan of the PSHAAG2?
The electrolytic capacitors are rated for 10,000 hours at 85°C—about 1.14 years at full load in a hot environment. In a 40°C cabinet, the lifespan extends to about 15-20 years. The fan is the most likely failure point—it’s rated for 50,000 hours (about 5.7 years). Replace the fan every 5 years proactively if the cabinet runs warm. We’ve seen these supplies run 15 years in climate-controlled cabinets.

Q: What’s the lead time for a surplus unit?
We keep 4-6 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. This board is not ITAR-controlled, so we can ship to most countries without an export license. We include a GE certificate of origin and commercial invoice with every shipment. Contact us if you need expedited shipping for a critical outage.

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