Symmetra 80k phases

[Anonymous user]

Hello,

We powered up a new hp blade enclosure today, to what I supposedly thought was phases 1 & 3 of our Symmetra unit. Before powering up the enclosure, the phases were as followed:
Output Watts at n+1: 45 % 70 % 55 %

After powering on the enclosure, the phases were:
Output Watts at n+1: 48 % 78 % 60 %

Does this make sense that all phases went up, and that the one that went up the most was a phase that I didn't even plug into?

Message was edited by: ekrengel

[upsguy_apc]

The only way % load goes up is when the load actually goes up. You must be mistaken as to what phases are being utilized by this new server.

Are you using the distribution from the 80K MBP PDU or is your UPS output hardwired to a panel and you have your own distribution? If you have your own distribution your electrician may have mislabled/landed the phases in the panel.

If you really want to verify what phase is A/B/C I would take a few portable fans or heaters and plug them into the phase that you think is A. Check the load level, turn the fans on high 1 at a time and see if you can watch the load level increase and see if it corresponds to the phase you think it is. Unplug and repeat for each other phase. This would be the easiest way to check without having to open breakers or shut down load to see which is which.

[Anonymous user]

Yeah, our UPS output is hardwired to a panel. The thing is, the panel was never labeled with what phase it is, only with the circuit number. We have 3 panels, and we just assumed that the first panel is phase 1, second is phase 2, and third is phase 3.

I knew that was probably wrong. What I have also been told is that if you want to know the phases judging from the circuit panel, all you have to do is just count down the circuits starting from the left side down. First circuit is phase 1, and so on. Then start over on the next side (I think this should be correct in our situation). I have not tested that yet...

But what doesn't make sense to me is how all three phases went up, when I only plugged into 2 receptacles. I thought about this over the weekend...this might be because the receptacles that I plugged into were 2 pole circuits.

When you have 2 pole circuits, does this combine phases?

EDIT*_
If that is the case, it would make sense that phase 2 went up the most.

Plugged into:*
+(panel 1), circuit 2-4, phase 1 and 2+
+(panel 3), circuit 10-12, phase 2 and 3+

Phase 2 gets doubled up

Message was edited by: ekrengel

[upsguy_apc]

Yes when you plug into 2 pole circuits you would be using power from 2 phases. It is possible that you are pulling from phase 1/2 and 2/3 or something like that. Its going to be to hard to tell you what the possible causes for seeing load increase through this forum. It sounds like you will need an electrician to determine what phases are landed where and how that power makes it way to your servers.

Also remember phase 1/2/3 coming out of the UPS can easily be rolled into another order by the electrican in your panel 2/1/3.

[Anonymous user · Accepted solution]

Thanks for your replies. Yes having an electrician come out and tell me how the phases are configured is probably the best way. Although I did do some tests yesterday, and it seemed what I said was correct about the phases being in order down 1 side of a panel.

I'm assuming the electrician would have to turn the UPS off to reconfigure the phases...so that's not really an option.

Thanks!