SMA America, LLC
Multicluster Operation
Technical Description
SI5048U-TUS121440
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16.7 Automatic Frequency Control (AFC)
In Multicluster operation, automatic frequency control (AFC) can only be activated at the main master.
This function is activated using the ”250.11 AfraEna” parameter.
16.8 Firmware Update
Carry out the update on all masters of the individual
clusters via an SD card. All extension masters must have
completed their updates! The message shown on the right
is displayed.
After the update of the masters has been carried out,
carry out an automatic update of the slaves.
16.9 Fault Handling in a Multicluster System
For Multicluster system operation, the entire main cluster is always required. If a device in the main
cluster fails (master and/or slave), this causes the main cluster to stop.
If the main cluster is stopped — whether due to a fault, or otherwise — this causes the extension clusters
to stop, and thus the entire Multicluster system.
For operation of an extension cluster, it is necessary that at least the master device (of the extension
cluster) is operating. If a slave device in the extension cluster fails, this does not cause the master
device to stop.
The devices in an extension cluster are only started up if the respective device detects a voltage upon
starting.
16.10 Grid Operation
The Multicluster system is not certified for gried-tie applications.
Stopping the Sunny Island
It is recommended to stop the entire cluster network, and to deactivate the loads insofar as
this is possible.
DC Circuit Breaker
Do not activate the DC circuit breaker during update process!
Starting the Multicluster System
Start the system only after the firmware update has been carried out on all Sunny Islands.
