Operating Manual SB3-5TL-21-BE-en-10 27
SMA Solar Technology AG 6 Electrical Connection
Grounding conductor monitoring:
The inverter is equipped with a grounding conductor monitoring device. This grounding conductor
monitoring device detects when there is no grounding conductor connected and disconnects the inverter
from the utility grid if this is the case. Depending on the installation site and grid configuration, it may be
advisable to deactivate the grounding conductor monitoring. This is necessary, for example, in an IT
network if no neutral conductor is present and you intend to install the inverter between two line
conductors. If you are uncertain about this, contact your grid operator or SMA Solar Technology AG.
☐ Grounding conductor monitoring must be deactivated after initial start-up depending on the grid
configuration (see Section 8.4, page 42).
6.3.2 Connecting the Inverter to the Utility Grid
Requirements:
☐ The connection requirements of the grid operator must be met.
☐ The line voltage must be in the permissible range. The exact operating range of the inverter is
specified in the operating parameters.
Procedure:
1. Disconnect the circuit breaker and secure against reconnection.
2. If an additional DC load-break switch is available, switch off the DC load-break switch and
secure against re-connection.
3. If the ESS is in use and plugged in, remove the ESS.
4. Unscrew all six screws of the lower enclosure lid using an Allen key (AF 3) and remove the
enclosure lid.
Safety according to IEC 62109 when the grounding conductor monitoring is
deactivated
In order to guarantee safety according to IEC 62109 when the grounding conductor
monitoring is deactivated, one of the following measures must be met:
• Connect a grounding conductor made of copper wire with a cross-section of at least
10 mm² to the connecting terminal plate for the AC cable.
• Connect additional grounding with the same cross-section as the connected grounding
conductor at the connecting terminal plate for the AC cable (see Section 6.3.3
"Connecting Additional Grounding", page 29). This prevents touch current if the
grounding conductor at the connecting terminal plate for the AC cable fails.
Connection of additional grounding
In some countries an additional grounding is required. In each case, observe the locally
applicable regulations.
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