SMA Solar Technology SUNNY BOY 3.0, Operating Manual, Page: 24 / 100

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 9.11, page 59).
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 copper-wire grounding conductor with a cross-section of at least 10 mm² to
the AC connector bush insert.
• Connect an additional grounding that has at least the same cross-section as the
connected grounding conductor to the AC connector bush insert (see Section 6.3.3,
page 27). This prevents touch current in the event of the grounding conductor on the
AC connector bush insert failing.
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 that has at least the
same cross-section as the connected grounding conductor to the AC connector bush
insert (see Section 6.3.3, page 27). This prevents touch current in the event of the
grounding conductor on the AC connector bush insert failing.
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. Dismantle the AC cable by 50 mm.
6 Electrical Connection SMA Solar Technology AG
Operating Manual SB30-50-1AV-40-BE-en-10 24