SMA SUNNY BOY 3.0 - Configuring the Modbus Function

8 Operation
SMA Solar Technology AG
Operating manual SBxx-1AV-41-BE-en-12 65
6. In the field Timeout, enter the time that the inverter is to wait before it limits its nominal power
to the set fallback value.
7. If, in the event of a 0% or 0W specification, the inverter is not permitted to feed small amounts
of active power into the utility grid, select the entry Yes in the drop-down list Grid
disconnection for 0% active power setpoint. This ensures that in the event of a 0% or 0W
specification, the inverter disconnects from the utility grid and does not feed in active power.
Make the settings for systems with manual setpoint
1. In the tab Active power mode set the switch Grid connection point regulation to [On].
2. Enter the total PV array power in the field Nominal PV system power.
3. In the drop-down list Operating mode active power setting, select whether active power
limitation is to be performed via a fixed specification in percent or in watts.
4. In the field Set active power limit, enter the value to which the active power at the grid-
connection point is to be limited. The value must be set to 0 for zero power output.
5. Set the Active power setpoint to [On].
6. Select the entry Manual setpoint in % or Manual setpoint in W for manual specification
and enter the respective setpoint value.
7. If the inverter itself is to control active power at the grid-connection point, perform the following
steps:
• In the drop-down list Operating mode active power setting, select the entry External
setting.
• In the drop-down list Fallback behavior, select the entry Apply fallback values.
• In the drop-down list Grid disconnection for 0% active power setting select the entry
No.
8.13 Configuring the ModbusFunction
The Modbus interface is deactivated by default and the communication ports 502 set.
In order to access SMA invertes with SMA Modbus
®
or SunSpec
®
Modbus
®
, the Modbus interface
must be activated. After activating the interface, the communication ports of both IP protocols can
be changed. For information on commissioning and configuration of the Modbus interface, see the
technical information "SMA and SunSpec Modbus® Interface" at www.SMA-Solar.com.
For information on which Modbus registers are supported, see the technical information "Modbus®
parameters and measured values" at www.SMA-Solar.com.