SMA SC 500CP-US Maintenance Manual - Manual (Page 27)

SMA America, LLC 6 Disconnecting the Inverter
Maintenance Manual SCCP-US-WH-US_en-30 27
3. Secure the DC Switch in the door against accidental reconnection using a padlock.
4. Wait 15 minutes until the inverter capacitors have discharged completely.
5. Externally disconnect the AC voltage of the MV transformer.
6. If no AC Disconnect is present, disconnect the external AC/DC Disconnect Unit.
7. Disconnect the DC voltage in the main distribution or sub-distribution.
8. If an internal AC Disconnect is present, open the flap of the AC Disconnect and switch the AC Disconnect off.
9. Disconnect the external supply voltage externally.
10. If applicable, disconnect any additional external voltage.
11. Open the door of the interface cabinet.
12. Switch off the supply voltage.
• If the voltage is supplied externally, switch off the circuit
breaker of the external voltage supply in the inverter.
or
• If the voltage is supplied internally, switch off the circuit breaker
of the internal voltage supply in the inverter.
13. Switch off the circuit breaker of the grid monitoring.