Can you let us know the both PSU DPN#? From the video, the buzzing sound heard as improper contact connection, do you have any other power cable to try? Have you tried swapping PSU to check the noise? Are you able to identify the source of the noise, if it's from the PSU connector or UPS connector?
That's what i was thinking about in the beginning, a contact issue. I tried with different cables, i took out both PSU units and plugged them one by one into the UPS output, always the same nose (except when they are not connected to the server, the buzzy noise becomes periodic like shown in the videos PSU1 and PSU2)
The sound comes from the PSU not the UPS and located somewhere close to the connector, in both PSUs.
Thanks for the troubleshooting video that you have done, that's quite a risky method, but effective.
I'd saw the video, the power supply is 870W. I am unsure if the UPS would be able to support the load. I went through EATON's page for UPS recommendation https://dell.to/2R0vI1g. Seems that most UPS are listed 1000W and above.
That was the last cause i had in mind, an under estimated UPS power value, i was saying that since i was having only one PSU (870W) plugged into the UPS output (850VA), there would be no problem. But obviously i was wrong. Thanks for pointing that out.
Since i am gonna have to wait for a while before buying a new UPS (due to the actual containement), is it okay to used that UPS even if when the power goes out, the PSU starts maling that buzzy sound ? And from your experience, what may be happening inside the PSU ?
Joey's shift ended, so I'll step in for your post. Speaking to the buzz, it could be any number of things. If its constant, it could be a fan. If it's only buzzing when connected to a particular power source, there may be some buzzing happening with the transformers in the PSUs. Transformers can make noise as they age, or with line level imbalances. Or, it may have nothing to do with the transformer in your case, but it is a possibility.
I'd look at replacing the power supply. If it were my personal server, I might take the PSU apart. However, replacing the PSU is the safest surest way to have that noise stop and not have to worry about it.
Operating under the assumption that it is a transformer, I don't think it would create additional issues, because once the magnetic field around the transformer collapses, there's no more power being supplied.
However, we're not electrical engineers, the only thing here that is not conjecture would be my recommendation. My recommendation would be to replace the PSU, or at the least, not use it with that UPS. That buzzing would indicate that something that shouldn't be vibrating, is. It might be that the UPS is struggling to provide necessary power and creating a line level issue, or it may be the PSU itself.
DELL-Joey C
Moderator
•
4.1K Posts
0
March 30th, 2020 19:00
Hi,
Can you let us know the both PSU DPN#? From the video, the buzzing sound heard as improper contact connection, do you have any other power cable to try? Have you tried swapping PSU to check the noise? Are you able to identify the source of the noise, if it's from the PSU connector or UPS connector?
beillka
3 Posts
0
March 31st, 2020 12:00
Hello,
That's what i was thinking about in the beginning, a contact issue. I tried with different cables, i took out both PSU units and plugged them one by one into the UPS output, always the same nose (except when they are not connected to the server, the buzzy noise becomes periodic like shown in the videos PSU1 and PSU2)
The sound comes from the PSU not the UPS and located somewhere close to the connector, in both PSUs.
Thanks in advance.
DELL-Joey C
Moderator
•
4.1K Posts
0
March 31st, 2020 21:00
Hi,
Thanks for the troubleshooting video that you have done, that's quite a risky method, but effective.
I'd saw the video, the power supply is 870W. I am unsure if the UPS would be able to support the load. I went through EATON's page for UPS recommendation https://dell.to/2R0vI1g. Seems that most UPS are listed 1000W and above.
beillka
3 Posts
0
April 1st, 2020 11:00
Hello,
Thanks a lot for your answer and your time.
That was the last cause i had in mind, an under estimated UPS power value, i was saying that since i was having only one PSU (870W) plugged into the UPS output (850VA), there would be no problem. But obviously i was wrong. Thanks for pointing that out.
Since i am gonna have to wait for a while before buying a new UPS (due to the actual containement), is it okay to used that UPS even if when the power goes out, the PSU starts maling that buzzy sound ? And from your experience, what may be happening inside the PSU ?
Thanks in advance.
Dell-DylanJ
4 Operator
•
2.9K Posts
0
April 1st, 2020 11:00
Hello,
Joey's shift ended, so I'll step in for your post. Speaking to the buzz, it could be any number of things. If its constant, it could be a fan. If it's only buzzing when connected to a particular power source, there may be some buzzing happening with the transformers in the PSUs. Transformers can make noise as they age, or with line level imbalances. Or, it may have nothing to do with the transformer in your case, but it is a possibility.
I'd look at replacing the power supply. If it were my personal server, I might take the PSU apart. However, replacing the PSU is the safest surest way to have that noise stop and not have to worry about it.
Operating under the assumption that it is a transformer, I don't think it would create additional issues, because once the magnetic field around the transformer collapses, there's no more power being supplied.
However, we're not electrical engineers, the only thing here that is not conjecture would be my recommendation. My recommendation would be to replace the PSU, or at the least, not use it with that UPS. That buzzing would indicate that something that shouldn't be vibrating, is. It might be that the UPS is struggling to provide necessary power and creating a line level issue, or it may be the PSU itself.