9 Opening and Closing SMA Solar Technology AG
68 SB30-50TL-21-IA-en-21 Installation Manual
5. If an external DC switch-disconnector is in use, disconnect it.
6. If an ESS is used, check it for wear (see Section10.3 "Checking the Electronic Solar Switch for
Wear", page70).
7. If a multi-function relay is connected, switch on the supply voltage to the relay.
8. Switch the miniature circuit-breaker on.
9. Check whether the display and LEDs are indicating
a normal operating state (see Section7
"Commissioning", page57).
☑ The inverter is now closed and in operation.
The ESS can be damaged if it is not connected correctly.
• Plug the ESS in securely.
The handle of the Electronic Solar Switch must be
flush with the enclosure.
• Check that the ESS is securely in place.
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