almothanna

How are you? I have connected three axpert Max E 11kw inverters in parallel, but I faced a problem of error 60! Does it the difference of firmware maybe cause this error? Two inverters firmware is 00078.10/00038.18 and the third inverter firmware is 00078.11/00038.20 If this difference is the problem reason, how to get the update or some one can share it here!?

Thanks for your valuable reply I appreciate it.. First thing I did removed out the 47 burden resistor, it's measured 100% correct! and i measure the CT secondary internal resistance it reading 175 Ohm (without the 47 resistor) is this internal resistance is ok for this CT!? One more thing maybe you didn't got my point about the supply of OP07CP, as you know it has two supply point V1&V2 one is negative the other one is positive, in mine the negative supply coming to the pin number 4 is -12 exactly, but the positive supply which coming to the pin number 7 is +12.5! My question is this difference 0.5V between the two supply points could cause OP07CP failure or not!?

How are you I facing the same problem error 57, you mentioned many points to trace this error. I want to ask you some questions 1_How to demagnetize the CT? 2_the burden resistor 47 you said it should measure around 22 something In Maine there is only one 47 burden resistor which measured 37! (In circuit) Is it ok? 3_the supply of OP07CP ic is it supposed to be symmetric -12&12 at the v1 and v2? Because in main the -12 which supplies for the 7912 is ok, but the v2 is 12.5! Is this difference (0.5v) cause the OP07CP failure!?