SMA SC 500HE-US Maintenance Manual - Manual (Page 21)

SMA America, LLC 4 Maintenance
Maintenance Manual SC500HEUS-eng-WH-IUS120411 21
If there is no AC disconnecting device available, disconnect the AC voltage from the medium-
voltage transformer with the medium-voltage switch and ensure that it cannot be switched on
again.
6. Switch off the AC switch-disconnector.
7. Check whether the inverter's display shows 0 V DC voltage.
If the inverter's display does not show 0 V DC voltage, contact the SMA Service Line.
8. Check whether the inverter's display shows 0 V AC voltage.
If the inverter's display does not show 0 V AC voltage, contact the SMA Service Line.
9. In the case of additional external voltages:
– Disconnect additional external voltages and secure them against being switched back on.
11. If external control voltage is used, switch off the miniature circuit-breaker for the external control
voltage and secure it against being switched back on.
12. Switch off the miniature circuit-breaker for the internal control voltage and secure it against
being switched back on.
13. Switch off the miniature circuit-breaker for the voltage meter and secure it against being
switched back on.
14. Ensure that all poles are free of voltage.
15. Ground and short-circuit.
16. Cover or shield any adjacent live components.
☑ The Sunny Central is disconnected.
10. %"/(&3
Electric shock from live voltage
The component parts of the Sunny Central are energized. Touching component parts of the
Sunny Central can result in severe injuries or death.
• After disconnecting the inverter, wait at least 10 minutes until the inverter's capacitors
have discharged completely.