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] <mailto:[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/ <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] <mailto:[email protected]> Rick Linford at: [email protected] <mailto:[email protected]> For policy questions, send mail to: Jim Bacher at: [email protected] <mailto:[email protected]> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &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
