Sma SUNNY BOY User Manual download pdf (Page 29)

SMA Solar Technology AG Measurement Channels and Messages

User Manual SB_SMC-BEN092840 29

6.2 Status Messages

The inverters can be in various operating modes. These are displayed as status messages which can

vary according to the method of communication.

Vpv PV input voltage

Vpv-Setpoint PV target voltage

Zac Grid impedance

Message Description and corrective measure

Balanced The Sunny Mini Central has disconnected from the grid, or is limiting its output to

5 kVA over a 10-minute average. The Sunny Mini Central is part of a three-phase

system equipped with two further Sunny Mini Centrals and the SMA Power

Balancer to avoid unbalanced load. The "Balanced" message is displayed for the

following reasons:

Case 1:

The operating parameter "PowerBalancer" is set to "PhaseGuard". One of the three

Sunny Mini Central inverters in this system has indicated a grid fault and

disconnected from the grid. Consequently, the other two Sunny Mini Central

inverters also disconnect from the grid to avoid an unbalanced load, and send the

message "Balanced".

Case 2:

The operating parameter "PowerBalancer" is set to "PowerGuard". One of the

3 Sunny Mini Centrals in this system has detected a device or grid fault and

disconnected from the grid. The two remaining Sunny Mini Centrals reduce their

output over a 10-minute average to 5 kVA in order to prevent an unbalanced load.

Case 3:

The operating parameter "PowerBalancer" is set to "FaultGuard". One of the 3

Sunny Mini Centrals in this system has indicated a device or grid fault and

disconnected from the grid.

When grid failure occurs, the other two Sunny Mini Centrals also disconnect from

the grid to prevent an unbalanced load, and send the message "Balanced".

In the event of a device fault, the fault message is sent to the other two devices with

a time lapse of 5 minutes. After the 5 minutes have passed, the other two devices

disconnect from the grid and send the message "Balanced".

Measuring

channel

Description

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Sma SUNNY BOY User Manual Page 29