June 3, 20242 yr Good Day Chaps, Can someone point me in the right direction please. I have this AER Power inverter Model: M5000H-48P 5kW inverter,all FETs and fuses are intact. The inverter powers up from battery supply or AC mains,fans run at full speed and the LCD displays battery SOC as OK otherwise all values as zero,after the screen test,even when scrolling through the menu options. All 3 LEDS above the LCD are out and no fault code is shown on the LCD. The 3 power rails,where the smoothing caps often dry up,are at 12v,10v and -16v,scope showing negligible ripple and caps are testing OK. Output of the 5v and -12v regulators are good. No obviously burnt components on the main board or control card. I can post pictures if that will help. Any idea where else to look ? Cheers.
June 4, 20242 yr 23 hours ago, DaveS said: all values as zero 23 hours ago, DaveS said: The 3 power rails, where the smoothing caps often dry up, are at 12v,10v and -16v,scope showing negligible ripple and caps are testing OK. Output of the 5v and -12v regulators are good. 23 hours ago, DaveS said: Any idea where else to look ? My wild guess is that +12 V and/or -12 V is not getting to the control board, or at least it's not getting through to the op-amps. Though on genuine Axpert control boards, loss of +12 V will cause the processor to stay in reset. The other wild guess is that the processor has failed. The analogue measurement section seems to be the least robust part of these C2000 DSPs. Usually the control boards do a decent job of protecting the analogue inputs, but in this case, that protection may have failed.
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