I agree.with ludo the settting are off/in conflict.
Work without VS for now. (So disable it).
It is like conditional AC connect when you program with Victron Connect. You don’t want this right now.
Establish that is does connect, charge etc.
Weak AC is good if there is a generator that will be used combined wide frequency settings
But those settings conflict with UPS.
(so choose there- one set or the other)
@lxonline for learning purposes, can you explain more behind weak AC + wide frequency vs UPS? I don’t think I’ve run across any documentation noting these conflict each other.
Update. We tried the following, in order:
None seemed to accept Mains.
A few things we noted along the way:
Finally, we decided to try copying the settings from the working unit to the fussy unit. No change.
Are we at a warranty claim?
Thanks
Strange that it didn’t go to bulk charging ?
Are the reported errors “live” or historical ?
Are the errors appearing in time with the relay clicking to connect?
As you watch the green bar progresses (as it is synchronizing) then the relay click.
If the voltage is dropping at the click -h> then maybe there is another issue like a dodgy breaker or high resistance connection. (So heat shrink or tape under the lug on the ac connection - or insulation clamping in a breaker etc).
I think you are at this point after checking with a DMM as it is conecting if there is or isn’t real voltage drop. (Just imagined by the inverter 
)
VE.config has a build-in help.
Menu → Help → “What is this?” → click on the item you want to learn more about
@Ludo the errors were live
@lxonline interestingly, we weren’t hearing any clicking when the bar got to the end… maybe that’s a sign of a bad relay?
Unfortunately I lost my cousin helping down at the house. We pulled on wires and tightened connections, so I don’t think it’s that. I can’t do the help without being connected to the unit. Is there any documentation that explains how those settings are in conflict?? What happens if both are active? I highly recommend something like that get added to the Quattro manual! I ran these settings by other forums, and nobody batted an eye.
Logic?
UPSs only accepts a small voltage range (and no sudden fluctuations) and is fussy about voltage and frequency.
The other two settings are telling the system not to be fussy.
Ergo - conflict.
If the relay is not clicking something is not right.
It would usually make at least three attampts before calling it quits.
