L-G failure sounds like the Y-caps conducting. I made a special input connector for my unit that connected to traces that went around the Y-caps and/or the GDTs on the input (single phase 120V) that was used during FAT.IIRC, we also had to pull pins b/c we had faults from a UL-rated Phoenix connector. It wasn't the connector, it was the solder bumps under the board that were arc'ing. So, we had a customer connector made that only used 3 of the 5 sockets. Amongst the tricks I've had to employ.... Colorado Brian ---------- Original Message ---------- From: Doug Nix <d...@ieee.org> To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] HiPot Testing of 3-Phase PSU Question Date: Tue, 25 Jun 2024 15:31:19 -0400
Hi Brian, This is my bailiwick. If you are talking about semiconductor manufacturing equipment, the correct standard is IEC 60204-33. If it’s standard manufacturing machinery, then it’s IEC 60204-1. Clause 18 calls out 1 kV or 2x nominal mains voltage, whichever is more for the “voltage test” (read hipot) for machinery designed for connection to a TN supply. The standard permits you to disconnect any equipment that is either pre-certified (as most industrial PSUs are) or that might be damaged by the test. Any industrial PSU built today will have surge suppressors on the primary side. Also, mains filters used in these machines will have Y-caps that will conduct significant current between the mains conductors and PE during a hipot test. So, the answer is to disconnect these devices and test the mains voltage wiring upstream and downstream of them separately. If the PSU is downstream of a control transformer, you need only test up to the primary of the control transformer. All industrial equipment is supposed to be hipot tested at the factory; however, just because it’s supposed to be done doesn't make it so.Best regards, Doug nixd...@ieee.org+1 (519) 729-5704 On Jun 24, 2024, at 08:19, Brian Kunde <bkundew...@gmail.com> wrote: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 BrianThis 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 EMC-PSTC@LISTSERV.IEEE.ORG All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ 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: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org 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 EMC-PSTC@LISTSERV.IEEE.ORG All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ 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: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org 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 EMC-PSTC@LISTSERV.IEEE.ORG All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ 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: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
