SMA SC 500CP XT Service Manual - Manual (Page 12)

3 Power-Generating Unit Protection Test SMA Solar Technology AG
12 SCCPXT_EZE-SG-en-11 Instructions for the Protection Test of the Power-Generating Unit
3.4 Disconnecting the Inverters
Procedure:
1. Switch the key switch of the Sunny Central to Stop.
2. Wait 15 minutes. This allows the capacitors to discharge.
3. Disconnect the external AC voltage of the MV transformer.
4. Disconnect the DC voltage in the main distribution (e.g. Sunny Main Box) or the sub-distribution (e.g.
Sunny String-Monitor).
5. Open the door of the interface cabinet.
6. Switch off the AC circuit breaker.
7. Disconnect the external supply voltage externally.
8. Disconnect any additional external voltage.
9. Switch off the circuit breaker for the supply voltage.
10. Switch off the circuit breaker for the voltage meter.
'$1*(5
Electric shock due to live voltage
The components of the Sunny Central are live. Touching the components in the Sunny Central will result in death or
serious injury.
• Before performing any work on the Sunny Central, disconnect the inverter and secure it against reconnection.
• After switching off the inverter, wait at least 15 minutes until its capacitors have discharged completely.
• Ensure that no voltage is present.
Connecting and disconnecting the AC voltage of the MV transformer
Only a duly authorized person trained in electrical safety is allowed to connect and disconnect the AC voltage of
the MV transformer.