9 Opening and Closing SMA Solar Technology AG
64 SB30-50TL-21-IA-en-21 Installation Manual
9.2 Disconnecting the Inverter from Voltage Sources
1. Disconnect the miniature circuit-breaker and secure against reconnection.
2. If a multi-function relay is connected, disconnect its supply voltage and ensure that it cannot be
reconnected.
3. If an external DC switch-disconnector is in use, disconnect it.
4. If an ESS is in use, disconnect it.
5. Loosen all six captive screws and remove the lower
enclosure lid. Use an Allen key (AF 3) to do this.
6. Use a current clamp to make sure no current is
present in the DC cables.
☑ If current is present, check the installation.
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