SMA SUNNY TRIPOWER CORE1 - Connecting the Inverter to the Utility Grid

6 Electrical Connection
SMA Solar Technology AG
Operating manualSTP50-40-BE-en-1534
Residual-current monitoring unit:
The inverter does not require an external residual-current device when operating. If local
regulations require the use of a residual-current device, the following must be observed:
☐ The inverter is compatible with type B residual-current devices that have a rated residual
current of 300mA or higher (information about the selection of a residual-current device see
technical information "Criteria for Selecting a Residual-Current Device" at www.SMA-
Solar.com). Each inverter in the system must be connected to the utility grid via a separate
residual-current device.
☐ When using residual-current devices with a rated residual current < 500mA, the rated residual
current must be set in the inverter (see Section8.20, page75). In this way the inverter
reduces the operational leakage currents and prevents a false triggering of the residual-current
device.
Overvoltage category:
The inverter can be used in grids of overvoltage categoryIII or lower in accordance with
IEC60664-1. That means that the inverter can be permanently connected to the grid-connection
point of a building. In case of installations with long outdoor cabling routes, additional measures to
reduce overvoltage categoryIV to overvoltage categoryIII are required (see the Technical
Information "Overvoltage Protection" at www.SMA-Solar.com).
6.2.2 Connecting the Inverter to the Utility Grid
Requirements:
☐ The connection requirements of the grid operator must be met.
☐ The grid voltage must be within the permissible range. The exact operating range of the
inverter is specified in the operating parameters.
Procedure:
1. Disconnect the circuit breaker from all three line conductors and secure against reconnection.
2. Ensure that the DC load-break switch is in the O position and is secured against reconnection.
3. If the enclosure lid of the AC Connection Unit is
mounted, remove all ten screws of the enclosure lid
using a Torx screwdriver (TX25) and remove the
enclosure lid towards the front.
10x
4. Remove the adhesive tape from the enclosure opening for the AC connection.