Thanks to all who have replied so far. Here are a few quick replies to questions I am being asked.
The hipot tester is showing a "Breakdown". It is not exceeding the tester's current capability (though that was a good question). I looked through all the information provided by the PSU manufacturer and no mention of any special conditions involving the hipot testing. The PSU does list a Phase to PE dielectric specification of 3500Vac. The PSU does not appear to have any jumper or means to disconnect surge suppression from outside the enclosure (it comes in a metal box). The only adjustment is a POT for adjusting the output voltage. We have contacted the manufacturer's Tech Support here in the USA but they have no idea what HiPot even is. They gave us an email address in Germany to send our enquiry to. It might take a few days, especially with the soccer football going on over there right now. Exciting ending during the Swiss game last night. We have a call in to our NRTL inspector to get his take on this topic. Thanks again for all replies. The Other Brian On Mon, Jun 24, 2024 at 10:57 AM Dan Roman <[email protected]> wrote: > Hi Brian, > > > > Is your hi-pot tester capable of delivering the current required to do the > hi-pot test without tripping? Are you experiencing a breakdown or maybe > the current setting on the tester just doesn’t go high enough, in which > case you’ll need a higher capacity hi-pot testing in production. I am > thinking this might be the most likely issue. > > > > Are there any conditions in the safety report for the power supply related > to hi-pot that may be applicable? > > > > Are there jumpers or provisions to disconnect EMC components (caps or > surge suppressors) for the purpose of doing a hi-pot test? You may need to > remove a jumper in the power supply to do the production hi-pot test and > then reinstall the jumper afterwards. > > > > Just some random thoughts. > > > > Dan > > > > > > *From:* Brian Kunde [mailto:[email protected]] > *Sent:* Monday, June 24, 2024 8:20 AM > *To:* [email protected] > *Subject:* [PSES] HiPot Testing of 3-Phase PSU Question > > > > I understand that commercial products are %100 HiPot tested at the > factory. Does this rule hold true for 3-phase industrial machinery? > > > > Here is why I am asking. I just pre-tested a German build 400-480Vac to > 24Vdc power supply (DIN Rail Mount). It passed all the tests, except it > failed the Phase-to-PE HiPot test at around 1000V. I tried both AC and DC > voltage and tried connecting it from a single phase to PE and tried all > phases connected together to PE. I tested a second power supply of the > same model and it did the same exact thing. So I am thinking that it is > supposed to perform this way. > > > > My concern is that in our factory, they will not be able to HiPot the > final product when the power supply is installed. > > > > I assume the power supply has some kind of built in surge suppression. So > how am I to use this PSU in my final product? > > > > Thoughts and comments would be appreciated. > > > > Best regards to all. > > > > The Other Brian > ------------------------------ > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > [email protected] > > All emc-pstc postings are archived and searchable on the web at: > https://www.mail-archive.com/[email protected]/ > <https://www.mail-archive.com/[email protected]/%20> > > Website: https://ewh.ieee.org/soc/pses/ > Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to > unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> > List rules: https://ewh.ieee.org/soc/pses/listrules.html > > For help, send mail to the list administrators: > Mike Sherman at: [email protected] > Rick Linford at: [email protected] > > For policy questions, send mail to: > Jim Bacher at: [email protected] > ------------------------------ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to [email protected] All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
