Configuring The Rapid Shutdown Function - SMA STP 33-US-41 User Manual

4 Operation
4. Select [Save and continue] after each step up until the step Grid management service.
5. Make the settings as described in the following.
Make the settings for systems with external setpoint
1. In the tab Active power mode set the switch Active power setpoint to [On].
2. In the drop-down list Operating mode active power setpoint, select the entry External
setpoint.
3. In the drop-down list Fallback behavior, select the entry Apply fallback values.
4. In the field Fallback value of the maximum active power enter the value to which the
inverter is to limit its nominal power in case of a communication failure to the higher control
unit at the end of the timeout time.
5. In the field Timeout, enter the time that the inverter is to wait before it limits its nominal power
to the set fallback value.
6. 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 Active power setpoint to [On].
2. Select the entry Manual setpoint in % or Manual setpoint in W for manual specification
and enter the respective setpoint value.

4.14 Configuring the Rapid Shutdown Function

The Rapid Shutdown function of the inverter must be enabled if the PV modules or PV strings are
equipped with an additional DC disconnection unit that disconnects the PV array from the inverter.
You can enable the Rapid Shutdown function by selecting one of three available operating modes
in accordance with the DC disconnection unit used. If you do not want to use the Rapid Shutdown
function, you can disable it.
Explanation of operating modes:
Operating mode
On
SunSpec Shutdown
Off
Procedure:
1. Open the user interface (see Section 4.1, page 21).
2. Log into the user interface as an Installer.
36 STP33-62-US-41-BA-en-11
Explanation
For using an additional DC disconnection unit independent of the inverter
between the inverter and PV array that disconnects the PV array.
For using PV array disconnect switch as per the SunSpec interoperability
specification.
The Rapid Shutdown function is disabled.
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