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September 24th, 2020 21:00
A question about the 495W EPP supply input voltage
I was installing a "new to me" R730 which has two EPP 495W supplies (DP/N 09338D). I use a 240W UPS and PDU which is only about 25% loaded.
I plugged in the first supply, server began to power up, and about 2 seconds later there was a loud bang and flash and the breaker on that segment of my PDU also tripped, killing everything else on that segment. I immediately pulled the supply and heard rattling and found part of a diode that must have caused the explosion.
I plugged the second supply into 120V instead and had no issues booting the server. An hour later I had everything else back up too.
The label on these supplies lists 100-240V input, so I don't believe I exceeded the rated input voltage. I have other servers also running on 240V with no blow-outs (R620, R630, Precision Rack 7910) and no errors, but these are the only 495W EPP supplies in any of them.
Is it OK to use 240V input on this model supply? Did I just get the firecracker version? Does Dell want to look at this thing? I'm around the corner from Dell Corporate, so not hard to drop off.
DELL-Stefan R
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September 25th, 2020 01:00
Hi Plocmstart,
it is ok to use it as you did. The stated input range from 100-240VAC is the official one. Those PSUs are capable to work also in a range from 90 up to 264 Volts AC. So, I don't think that this was the issue.
For me, it sounds more like a short circuit that occurred somehow.
You might check the server event logs if you find anything related to overvoltage or something like that.
If you still have an active warranty you might also ask the phone support to go deeper into the log files and also request a replacement and you can also ask if they want to have the PSU for further checking.
Let me know if you found anything.
Best regards
Stefan