AX1200i - overcurrent protection broken???

I have asked a question here: http://forum.corsair.com/v3/showthread.php?p=608833#post608833

In the meantime, I wonder if anyone else with an AX1200i can confirm that what I'm seeing is normal.

I've had some trouble with the monitoring software on my AX1200i, and several times the multi-rail mode overcurrent protection has tripped in error, when there wasn't actually an overcurrent, due to spurious current values.

What worries me is this: When OCP trips, the PSU does not shut off the supply of current, rather the PC just reboots as though the reset button had been pressed.

Now Corsair have said that the AX1200i does not have multi-rail mode when the Corsair Link software isn't running (see http://forum.corsair.com/v3/showthread.php?t=111112)

So my concern is, that if OCP trips on a real short, then the PSU will reset the PC, now we're outside of windows and Corsair link isn't running any more, so no more OCP - 100+ amps goes through our short.

I'm trying to confirm with Corsair that this really is the case, but I can't see how else I can reconcile the behaviour I'm seeing (the reset when OCP trips) with the fact that Corsair have said there is no configurable OCP without the software running.

Can anyone else with an AX1200i confirm they also see a reset (rather than a complete power down) if the configurable multi-rail OCP is tripped?


I'm not exactly super hopeful anyone will be able to help - there can't be that many AX1200i out there yet, and even if people do have one hopefully they have been lucky enough not to have the bogus OCP trips I've been having, but I still thought it was worth asking. Perhaps some curious (and helpful) member could set an OCP rail to 20 amps (the lowest setting possible) then load up their GPU and get it to trip???

Resetting on an overcurrent rather than shutting down completely just seems like such odd behaviour, I am wondering if there is something about my setup that's causing it - surely it can't be by design that the PSU stays on and keeps delivering current if an overcurrent situation has been detected???
Edited by BorisTheSpider - 10/21/12 at 1:01pm

Hi,

No, this definitely isn't a "on after power comes back" thing. If I pulled the plug on the PC then plugged it back in, it would stay off.

It's definitely the PSU doing it.

OK, I have something to add that may be relevant to why this is happening.

I shut down to triple-check that I was right when I said I had the "Off after AC power loss" setting switched correctly in the BIOS, so that power would stay off. It was set correctly as I had recalled.

Then I pulled the plug for a few seconds, reinserted and the system stayed off.

Then I powered on, pulled the plug quickly, and reinserted it before the power had drained from the motherboard/psu (the few seconds when the LEDs etc. stay on after wall power has been switched on).

When the plug is reinserted before power has fully drained from the system, it just powers back on.

Perhaps so, but after my AX1200 destroyed my motherboard I brought this as a replacement specifically because I had lost faith in a single 100A rail - it's too big, and what happened to me could easily have resulted in a fire.

The AX1200i is being sold as having multi-rail mode, but it not only doesn't work outside windows, it also seems that if a short does happen even while the software is running it won't offer any protection at all.

Let's not get carried away here though - first, perhaps someone could try replicating my test (a quick pull of the power cord, followed by plugging it back in before power has drained from the system) to see if other systems do the same thing. If they do, then the way the AX1200i trips the power momentarily is clearly at fault.