Axpert Inverter 3000VA/2400W switches off when starting.

[Mr T.]

Good day all

My inverter was overloaded when the microwave oven was used. I have had overloads before but waited some minutes and the inverter worked properly again. However this time the inverter stopped producing AC output, gave 3 beeps and shut down. After some minutes I tried to restart it. The panel showed the battery symbol with one bar only and a voltage of 1.1v and shut down almost immediately. The battery bank has 26v confirmed from my MM. I tried to start from having a small load attached to prevent any low load protection from being the culprit however thie unit refuses to invert from the battery bank now. The error showing is 01 with the led continuously on , which as far as I can ascertain, is for a locked fan. However I have had a flashing warning  of 01 for a long time with no sign of any fan problems and I have lived with this warning with no adverse effects until now.

I would really appreciate some help from all my learned fellow members as I am not in a situation to buy a new board or send the inverter in for repairs.

thank you in advance,

 

[Coulomb]

9 hours ago, Mr T. said:

The error showing is 01 with the led continuously on

First thing might be to open the case and sniff for that "burned resistor" (more likely "burned semiconductor") smell. While you're there, see if there is something blocking the fan(s), and maybe remove some dust if it might be stopping the fan from turning freely.

9 hours ago, Mr T. said:

The battery bank has 26v confirmed from my MM.

And does it stay at 26 V when the inverter tries to start up? You might have a collapsed cell which goes to zero volts or negative under even moderate loads.

If the inverter showing 1.1 battery volts is consistent, and the voltage actually isn't that low (check at the inverter's battery terminals), then perhaps the fuse has blown or gone high resistance, or the electronics that measures the battery voltage has failed suddenly. The fact that this all followed an overload suggests something high current related, however, for example the connections to the fuse or battery terminals might have discoloured and oxidised with heat.

Edit: you might want to peruse the MKS 1-3 kVA 24 V service manual.

Edited August 4, 2019 by Coulomb

[Mr T.]

Thanks Coulomb I will check as advised about the blown fuse. I have already opened the inverter box and cannot detect any burnt smell. Will keep you updated when I have a chance to inspect the system again in between my hectic days. Regards and thanks once again...