SMA CLUSTER CONTROLLER Installation - Manual (Page 68)

6.12.5.4 Feedback When Using Multiple Cluster Controllers
Feedback via Digital Signal
When using multiple Cluster Controllers, you have two options for feedback on grid operator
setpoints via digital signal:
• Connect one remote terminal to the digital output of each Cluster Controller (see
Section 6.12.5.2, page 63)
or
• Switch the digital outputs of several Cluster Controllers in series.
Switching digital outputs of several Cluster Controllers in series:
If you switch the digital outputs of several Cluster Controllers in series, feedback on an activated
active power limitation only occurs if all Cluster Controllers in the series acknowledge the active
power limitation.
Figure 31: Series connection of the digital outputs of three Cluster Controllers for feedback on grid operator
setpoints for active power limitation (example)
Feedback via analog signal
When using multiple Cluster Controllers, you must connect one remote terminal to the analog
current outputs of each Cluster Controller (see Section 6.12.5.3, page 64).
6.13 Using Fault Indicator Contacts
You can use two of the three potential-free relay contacts of the Cluster Controller as fault indicator
contacts and connect appropriate remote terminals (e.g. optical or acoustic signal generators) to
them. Via the fault indicator contact Digital output 1, you can signal the system status Error. Via
the fault indicator contact Digital output 2, you can signal the system status Error or Warning.
Observe the maximum load capacity of the relay contacts
The relay contacts may be loaded with a maximum switching power of 30 W and a maximum
voltage of 48 V
DC
.
6 Connection and Commissioning SMA Solar Technology AG / SMA America, LLC
Installation Manual ClusterController-IA-en-14 68