Good day all, there is a fault or warning with code NE F73 on axpert MKSIII inverter, I have tried to troubleshoot but yet to fix out the cause of the issue and no solution. The 2 units connected to work in parallel but not working. Please advise 

49 minutes ago, Abbas Olatayo said:

Good day all, there is a fault or warning with code NE F73 on axpert MKSIII inverter, I have tried to troubleshoot but yet to fix out the cause of the issue and no solution. The 2 units connected to work in parallel but not working. Please advise 

Have you isolated both inverters ac output via isolation and tested each inverter in standalone (SIG) mode? You may also have to cold restart by disconnecting ac in and battery. 

F73 is unusual, i cannot see one in the manual. 

NB : wether you may know this or not, please, NEVER combine ac outputs when one or more inverter is in single mode.  I will never sleep if i am in the remotest manner responsible for this. 

Edited March 19, 20233 yr by BritishRacingGreen

18 minutes ago, BritishRacingGreen said:

F73 is unusual, i cannot see one in the manual. 

 

Yes, it’s very unusual, and that’s the main reason I sought for assistance. All other connections are good, inverter works as single mode. 

6 minutes ago, Abbas Olatayo said:

Yes, it’s very unusual, and that’s the main reason I sought for assistance. All other connections are good, inverter works as single mode. 

Then code F73 is above your and my paygrade. We will have to phone a friend. @Coulomb do you copy? 

1 hour ago, Abbas Olatayo said:

there is a fault or warning with code NE F73 on axpert MKSIII inverter,

According to my notes, it means output voltages inconsistent. For example, one is set to 220 V, the other set to 230 V. Obviously, this won't fly when paralleling.

Note that to change the output voltage, the inverter switch has to be OFF (so there is no output generated). Make sure you have a charging source (AC-in or PV), or do it quickly so that the inverter doesn't shut down before or as it is writing the new value to EEPROM.

The NE part just means it's a NEw machine, not yet decided if it will become a master or a slave.

Edit: Sorry it took so long to respond 😎🙃

Edited March 19, 20233 yr by Coulomb

1 hour ago, Coulomb said:

dit: Sorry it took so long to respond 😎🙃

Yep, you took about 350ms, but its ok👍

I

On 2023/03/19 at 3:07 PM, Coulomb said:

According to my notes, it means output voltages inconsistent. For example, one is set to 220 V, the other set to 230 V. Obviously, this won't fly when paralleling.

Note that to change the output voltage, the inverter switch has to be OFF (so there is no output generated). Make sure you have a charging source (AC-in or PV), or do it quickly so that the inverter doesn't shut down before or as it is writing the new value to EEPROM.

The NE part just means it's a NEw machine, not yet decided if it will become a master or a slave.

Edit: Sorry it took so long to respond 😎🙃

I can confirm this is 100% correct.

Just had the issue now on a site and one inverter was at 230v and the rest at 220v

Adjusting them all to the same voltage solved the fault.