SMA SB3.0-1SP-US-40, Руководство по установке, Страница: 19 / 236

4 Product Overview SMA Solar Technology AG
Installation Manual SBxx-1SP-US-40-IA-xx-15 19
NOTICE - The inverter's Rapid Shutdown function is initiated by disconnecting the inverter from the
AC grid voltage, for example, by opening the main PV system AC disconnect. The AC disconnect
that serves as the Rapid Shutdown initiation device must be readily accessible and clearly marked
in accordance with National Electrical Code
®
. The Rapid Shutdown status of the PV system will be
indicated by the On/Off (Closed/Open) position of this AC disconnect. The Off (Open) position
indicates that Rapid Shutdown has been initiated.
Parallel Operation of the DC Inputs A and B
The DC inputs A and B of the inverter can be operated in parallel and up to three strings can be
connected to it in parallel. As a result, as opposed to normal operation, up to three strings can be
connected directly to inverters with two DC inputs and up to four strings to inverters with three DC
inputs. The inverter automatically detects the parallel operation of the DC inputs A and B.
Secure power supply operation
You can connect an external outlet and a switch to the inverter in order to activate the outlet. In
case of a grid failure, the outlet supplies a load with current from the PV system. When the outlet is
activated via the switch, the load is supplied with current from the PV system. The inverter
automatically regulates the energy supply of the outlet depending on the solar irradiation on the PV
system. When the outlet is activated and a load is supplied with current from the PV system, the
inverter is disconnected from the utility grid and does not feed into the utility grid.
If the available accessory communication set for TS4-R module technology components
(SMA Rooftop Communication Kit) is installed in the inverter, the secure power supply operation is
no longer available. The Rooftop Communication Kit supports the Rapid Shutdown function. The AC
circuit breaker in the system is simultaneously the Rapid Shutdown initiator. In the event of a grid
failure or when operating the Rapid Shutdown initiator, the inverter is also disconnected from
voltage sources on the DC side. Thus the supply of the outlet for secure power supply operation
can no longer be guaranteed.
Do not connect loads that require a stable electricity supply to the outlet for
secure power supply operation
Secure power supply operation must not be used for loads that require a stable electricity
supply. The power available during secure power supply operation depends on the solar
irradiation on the PV system. Therefore, power output can fluctuate considerably depending
on the weather or may not be available at all.
• Do not connect loads to the outlet for secure power supply operation if they are
dependent on a stable electricity supply for reliable operation.
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.
String-failure detection
The self-learning string failure detection identifies to which of the three inverter DC inputs the strings
are connected. The self-learning string failure detection identifies if the connected string is
inoperable and is no longer contributing to the energy yield (e.g. due to damages such as a cable
break) and monitors the input to which the defective string is connected. If the error persists, an
ENGLISH