Hello,I am facing a problem with a Symmetra LX 16KVa UPS. The Power Modules (SYPM4KP) have been reported as bad by the UPS, I tried to find out why the modules are failing, but I didn't find anything wrong with the circuits.These modules consist of 3 boards: inverter, PFC and control board.I think a board is failing, so to determine which board is bad, I used an operating module from another UPS to test.I tried two control cards and the UPS reported it as bad, so the control cards are the ones that may be failing. But, when I return the power module with its original boards to its UPS, it reports it as bad.The UPS and the power modules are quite old (year 2006), I know that it must be replaced by aging, but by the current conditions in my country that is not possible for now.
So, I think the UPS marks the power module as bad for aging, although it is operational. This is similar to the battery module, when they are replaced by new ones.
Recently I had a problem with battery replacement and had to apply a procedure to reset the internal EEPROM. This worked well and the battery modules were operational. And I'm thinking that the same thing is happening with the power modules, so I tried a similar procedure, however I can't find any documentation about it anywhere.
I was able to extract the memory from a control card and read it with a homemade EEPROM reader, but I have not been able to understand the internal information.
Has anyone in this forum faced this situation?
I would be very grateful for the help you could give me.Best regards.
After several days analyzing the information of the EEPROM (93LC66) and comparing it with the information of other damaged power modules, I managed to identify part of the internal structure.I found where the bytes for the checksum are stored and to calculate it, so now I can change the serial number and the date of manufacture. However, I don't know what information saves the bytes that change between one module and another.In the UPS there are operational power modules, but for obvious reasons I am not authorized to disconnect them, remove the EEPROM and read its contents.It would be helpful to know if anyone has had experience with this procedure.
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