3 Product Overview
SMA Solar Technology AG
User ManualSTP33-62-US-41-BA-en-1118
The PV array disconnect switches must disconnect the PV array from the inverter within a maximum
of 15 seconds after Rapid Shutdown initiation.
The inverter is capable of grid support operation where in case of a power failure or by activating
the AC disconnect, the inverter remains connected to the utility grid for a defined ride-through time
and waits for voltage recovery. If grid voltage does not recover within the defined ride-through
time, the inverter disconnects from the grid and a rapid shutdown is initiated.
The Rapid Shutdown function is disabled by default. The Rapid Shutdown function should only be
enabled when PV array disconnect switches have been installed within the PV array or between the
PV array and the inverter. The Rapid Shutdown function can be enabled during or after inverter
commissioning via the user interface by selecting the operating mode suitable for the PV array
disconnect switches. If the Rapid Shutdown function is enabled and no PV array disconnect
switches are installed, the inverter cannot discharge the connected DC input conductors during a
rapid shutdown. As a result, the inverter can be damaged.
WARNING - THIS PV RAPID SHUTDOWN EQUIPMENT DOES NOT PERFORM ALL OF THE
FUNCTIONS OF A COMPLETE PV RAPID SHUTDOWN SYSTEM. THIS PV RAPID SHUTDOWN
EQUIPMENT MUST BE INSTALLED WITH OTHER EQUIPMENT TO FORM A COMPLETE PV
RAPID SHUTDOWN SYSTEM THAT MEETS THE REQUIREMENTS OF NEC (NFPA 70) FOR
CONTROLLED CONDUCTORS OUTSIDE THE ARRAY. OTHER EQUIPMENT INSTALLED IN OR
ON THIS PV SYSTEM MAY ADVERSLY AFFECT THE OPERATION OF THE PV RAPID SHUTDOWN
SYSTEM. IT IS THE RESPONSIBILITY OF THE INSTALLER TO ENSURE THAT THE COMPLETED PV
SYSTEM MEETS THE RAPID SHUT DOWN FUNCTIONAL REQUIREMENTS. THIS EQUIPMENT
MUST BE INSTALLED ACCORDING TO THE MANUFACTURER’S INSTALLATION MANUAL.
Multifunction Relay
The inverter is equipped with a multifunction relay as standard. The multifunction relay is an
interface that can be configured for the operating mode used by a particular system.
SMA ShadeFix
The inverter is equipped with the shade management system SMA ShadeFix. SMA ShadeFix uses
an intelligent MPP tracking system to determine the operating point with the highest output during
shading conditions. With SMA ShadeFix, inverters use the best possible energy supply from the PV
modules at all times to increase yields in shaded systems. SMA ShadeFix is enabled by default. The
time interval of SMA ShadeFix is usually six minutes. This means that the inverter determines the
optimum operating point every six minutes. Depending on the PV system or shading situation, it may
be useful to adjust the time interval.
String-failure detection
The string-failure detection measures the total current of every input and continuously calculates the
mean values for the inputs in question. The total currents are compared with the mean values. If a
total current exceeds or falls short of the mean value by the set tolerance value, an event is
reported. Marginally increased total currents are reliably detected over several query intervals and
distinguished from typical current fluctuations of the PV array. String-failure detection is deactivated
by default and must be activated. In addition, the tolerance value can be set via the user interface
and the mean values read off.
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