Multicluster Operation SMA Solar Technology AG
132 SI5048-TEN093630 Technical Description
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
In multicluster systems, operation with the Sunny Island's special grid parameters is not possible.
The grid can be incorporated with the generator settings.
16.11 Generator Emergency Operation
If a multicluster system fails, manual operation via the generator is possible. For this purpose, the
generator must be started manually, directly at the generator. As soon as a voltage is present, the
Multicluster Box connects the generator through to the loads, without there being a Sunny Island in
operation.
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