Electronic – How to enable the 12V output in a storageworks HS0550 psu

power supply

[update: added trace of pins]

I needed a chunky 12V power supply, and I have found one of these HS0550 which is rated to supply 12V @ 45.2A according to the spec;
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It was surplus from an old HP StorageWorks XP20000 system. However none of the pins on the back seem to be giving +12V relative to what I think is GND. (there are pins with +3.6v and +4.68v)

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Googling the product code suggests it's manufactured by Hitachi as a "HITACHI 5529219-A USP-V DKU POWER SUPPLY";
http://www.serverworlds.com/hitachi-5529219-a-usp-v-dku-power-supply/

Unfortunately, I can't find any docs on either the code 5529219-A or "HS0550"

I don't recognise the pinouts, but those connectors are actually adapters and can be removed, which gives 5 blocks of 6 pins;

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I presume that these supplies use something similar to the ATX power supply standard, and require shorting across pins, or some other signal to enable to the 12V line;
http://www.techpowerup.com/articles/other/22

But I can't find any explanation of what power standard this PSU is using…

Some general troubleshooting seems to suggest that the unit is working, as I can find 9v at some points on the board when powered up, and there is a test point which is reading something like 418v DC;

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Here are some shots of the top and bottom of the board;

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I've traced out the pins, and the brown trace looks like it should by the one carrying 12V. I think the blue trace is the signal for connection pin.

There are 3 opto couplers in the centre which I think are being used to switch on the main 12V circuit. 2 are connected to one daughter board, and then the other to a separate daughter board with the 12V level adjustment.

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Best Answer

This PSU activates if you short pins 5-3 on J05 with a 1-1.5K resistor. If you change the voltage regulator (500Ω) to 1K, this PSU can output 14.2-14.5V (for charge 12V acid battery up to 400 Ah). For the best cooling, it is recommended to close the top and side vent, only open the backside.

PSU photo

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