I have an ESS 3-phase installation with 6 MultiGrid 48/3000/35-50 (two on each phase).
The system runs fine except this famous relay test.
I tried almost everything to troubleshoot this error, but before I try to contact my vendor(s) for the Multis, maybe someone here has an idea.
First of all, the error happens with or without load at the Multis. Without load means that there is nothing connected to the ACout of the Multis.
If I disconnect the Grid from the Multis (ACin), the Multis disconnect Active(in) and Neutral(in).
Measuring now the impedance between Neutral(in) and Neutral(out) shows > 5M Ohm, which looks correct for me.
Measuring Neutral(in) against PE(GND) shows 0 Ohm, Neutral(out) against PE shows > 10M Ohm.
If I disconnect the PE (GND) from the Multis the relay test passes without error and everything runs smooth.
I got my first 3 Multis about a year ago, the others are from October last year (1) and from two weeks ago (2).
For the error details see the attached pictures.
It would be very helpful to know what is tested during 'step 6'.
Any help is very appreciated.