DSA Posted January 29, 2005 Share Posted January 29, 2005 Hi Just looking at the Jands Vista specification, and noticed this: Power * Power Supply: Universal 100~264 VAC +/-10%, 47~63 Hz, 10A max * Power Consumption: 400W max * Inrush Current: 120A @ 230VAC 25C cold start * Power Factor: >85% typical @ 115VAC * Mains Connector: One (1) x IEC 3-pin socketWhat is meant by Inrush current? 120A seems a lot... Thanks,David Link to comment Share on other sites More sharing options...
themadhippy Posted January 29, 2005 Share Posted January 29, 2005 inrush current=start up current,or the amount of power the unit will draw fwhen inialy turned on,however it dont last long,maybe a few 100 milliseconds Link to comment Share on other sites More sharing options...
DSA Posted January 30, 2005 Author Share Posted January 30, 2005 inrush current=start up current,or the amount of power the unit will draw fwhen inialy turned on,however it dont last long,maybe a few 100 milliseconds<{POST_SNAPBACK}>OK. That is what I had assumed, but 120A still seems like a lot going through an IEC connector...or perhaps I am missing the point. What I am saying is that if it is connected to a 13A socket, is is not going to work?? David Link to comment Share on other sites More sharing options...
Andrew C Posted January 30, 2005 Share Posted January 30, 2005 inrush current=start up current,or the amount of power the unit will draw fwhen inialy turned on,however it dont last long,maybe a few 100 milliseconds <{POST_SNAPBACK}>OK. That is what I had assumed, but 120A still seems like a lot going through an IEC connector...or perhaps I am missing the point. What I am saying is that if it is connected to a 13A socket, is is not going to work?? David <{POST_SNAPBACK}> No fuse, and few if any, circuit breakers would react in 100ms, that is only 1/2 an AC cycle. Even then 120A seems huge. How can they claim 10A and 400W in the same spec? Is the 400W the PSU output, or did some marketing drone write the spec rather than an engineer? It should run of a 13A supply whether the 400W or 10A is correct. DOH! Just reread the Hippy's reply and he said a few ms, the above still holds (mostly) true. Link to comment Share on other sites More sharing options...
gaspipe58 Posted January 30, 2005 Share Posted January 30, 2005 Power factor given as a percentage is new to me. ;) Even if they mean .85 I'd be happier with something closer to unity. Tim Link to comment Share on other sites More sharing options...
Neil Vann Posted February 1, 2005 Share Posted February 1, 2005 Hi Guys, The spec was definitely written by an engineer and not a member of the marketing department, I don't know if the 120A is correct or a typo but I will get the hardware designer to have a look and clarify the answer. Thanks for pointing it out, Neil Neil VannAC Lighting Link to comment Share on other sites More sharing options...
Spot Posted February 8, 2005 Share Posted February 8, 2005 All, Have been asked to comment on this thread. Will try to keep it short: The inrush figure of 120A is in fact wrong - the correct figure is 90A, not that it makes much difference to the original question. It is specified at worst case and in general: - it is less than that, and - it is finished in less than mains half cycle (half cycle = 10ms @ 50Hz). Being so short it causes no problems with the connector. A large inrush figure is pretty normal for switchmode power supplies of the size used in the Vista. The reason the rated current is specified at 10A is to allow for the inrush characteristic. Hope this makes sense. David Link to comment Share on other sites More sharing options...
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