SMA SB 3000TL - Manual (Page 25)

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 system if there is no neutral conductor 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 8.5, page 40).
Safety in accordance with IEC 62109 when the grounding conductor monitoring is
deactivated
In order to guarantee safety in accordance with IEC 62109 when the grounding conductor
monitoring is deactivated, carry out one of the following measures:
• 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 to the connecting terminal plate for the AC cable (see Section 6.3.3, page 27
). 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, additional grounding is generally required. In each case, observe the
locally applicable regulations.
• If additional grounding is required, connect an additional grounding with the same cross-
section as the connected grounding conductor to the connecting terminal plate for the AC
cable (see Section 6.3.3, page 27). This prevents touch current if the grounding
conductor at the connecting terminal plate for the AC cable fails.
6.3.2 Connecting the Inverter to the Utility Grid
Requirements:
☐ The connection requirements of the grid operator must be met.
☐ The grid 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 it against reconnection.
2. If an additional DC load-break switch is available, switch off the DC load-break switch and
secure against reconnection.
3. If the ESS is installed and plugged in, remove the ESS.
4. If the lower enclosure lid is mounted, loosen all screws of the lower enclosure lid using an
Allen key (AF 3) and remove the enclosure lid.
6 Electrical Connection SMA Solar Technology AG
Operating Manual 25 SB30-50TL-21-BE-en-11