AndrewF

Hi Coulomb i cant find schematic showing the control board that sends sine wave(i assume) to main board, sine wave which passes all protection circuitry before reaching the gates of the drivers..., to trace where the signal is lost on QD2

Hi Coulomb QC1 has the square wave, QD2 has nothing , the optos have been replaced(measured resistance between gates and pin 6 on optos & resistance/connection is ok, have you had similar issues like this .....

oh and all gate drive 47ohm resistors replaced

Hi ok so ive replaced the faulty opto isolators in the sine wave converter circuit, as well as the diodes linking the opto isolator outputs to the gates of drivers, I'm only getting sine wave on QA1 & QB2. Ant ideas ??

Hi there, is there a way to test waveform signal to IGBT drivers without drivers installed , to confirm correct waveform etc to avoid damaging new IGBT drivers. There are 5 drivers, are they all part of the AC conversion circuit.

can setting 28 be changed from parallel to single output without using monitoring software. the inverter cant log into PC monitoring SW remains in error state. Regards AndrewF

Can setting 28 be adjusted/selected without monitoring software, as the software does not detect connection from inverter, on 2nd machine works fine !!! Regards AndrewF

Hi Coulomb, yes I was given 2 axperts to repair, one of them repaired, the other has much more damage, so i assume repair the 2nd unit then connect them in parallel to reset the menu to single mode, nothing can be done with control board in this error state , i cant get laptop to sync with repaired unit using control board with error message(swopped control boards).

Hi ,i have an "81" error NE on my expert display, anyone have an idea ?