System Commissioning – Additional Tests
In addition to the normal system testing that would be performed, the following additional tests
must be performed as detailed below.
Communications Link Verification
The correct operation of the Fronius Managed AC Coupling relies on the
communications link. It is vital that the communications link connection has
been setup correctly before operating the AC coupled system.
1. Check that all the communication cables have been connected
correctly.
2. Connect AC to the Fronius Primos. Do not connect the PV until
commissioning is complete.
3. Using SP LINK, connect to the SP PRO. In the Data View > Now tab
there should be a model number displayed for each of the installed
inverters.
Make sure to reset the SP PRO and the Fronius Primos after
configurations and wiring of both the SP PRO and Fronius are
complete.
The communication link may be further tested using the AC Solar Link Test found in SP LINK
under the Service Settings tab.
1. In the Service Settings tab click the “Reset Counters” button
Wait 2 minutes and check that the error count remains at zero for all the
connected Fronius Primos. (An error count of 5 or less per minute is
acceptable but, in this case, it is good practice to check the wiring and that
the termination resistors are set correctly in the SP PRO and Fronius Primos.
Once the Communications link has been verified for each Fronius Primo, the
DC feeds to each inverter can be switch on and full system testing and
verification can be performed.
Verification of Fallback Mode:
When the Fronius Primo loses communications with the SP PRO, the output of the all the
Fronius Primos will drop to zero power after 10 seconds.
To verify this function, disconnect the communications lead
between the SP PRO and Fronius Primo, wait 10 seconds.
Go to INFO > Readings menu on the front display of the first
Fronius Primo and check that the external limit (ext. Lim.)
drops to 0%.