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Hi This is Engineer Majid , from Iraq . I own an APC 1500 ups , the problem is that the utility power is always at 45Hz , causing my ups to work on backup mode all the time Is there any way or modification to reduce this frequency sensitivity feature ? Thanks
Zamolxe , Sir Every notes you’ve mentioned is correct , I know roughly that the efficiency will drop by 20% since using 45Hz frequency , but they’re long hours of using diesel generators , all I wanted from APC , is passing this 45 Hz as it is to my loads , but APC refuses this , since it’s out of (clean power) criteria !. But finally I succeeded to (Trick) the processor to deal with such low frequency by using external standard 50Hz function generator , you could watch my youtube channel to find how !. https://www.youtube.com/watch?v=GNEDBTa2… My youtube channel : majid khafaji
Well, this is also above my competency level, but this ups has a “line-interactive” topology (the term is outdated and nowadays it’s officially called something else, but the standby/offline; line interactive; online definitions still stick) and thus has the following basic schematic: http://www.pcguide.com/ref/power/ext/ups… As such, isn’t it the job of the AC/DC Converter of the device to “accept” your 45 Hz or not? If so, could it just be that you have to modify that?…of course i don’t know what effects this will have. Presumably these have been designed to work in a specific way at a specific efficiency - it will probably decrease efficiency? (or maybe you will be limited to power up less load in the manner that an online UPS will work as a step up transformer that will accept 110V instead of 230V but limits the load power draw to 50% of the rated VA)
