SMA SC 500HE-20 Maintenance Manua - Manual (Page 34)

7 Maintaining the Accessories SMA Solar Technology AG
34 SC500-800HE20-WH-en-10 Maintenance Manual
7 Maintaining the Accessories
7.1 Maintaining the Sunny String-Monitor
7.1.1 Disconnecting the Sunny String-Monitor
1. If there is a DC circuit-breaker in the Sunny String-Monitor, disconnect it. This ensures that there
is no current flowing through the Sunny String-Monitor.
2. If there is no DC circuit-breaker, disconnect the Sunny Central (see the Sunny Central installation
manual).
3. If there are fuses in the Sunny Central, remove them (see the Sunny Central installation manual).
4. If there are no fuses in the Sunny Central, remove the fuses from the DC main distributor.
7.1.2 Maintenance Interval
• Maintenance is to be performed on the Sunny String-Monitor every 24 months.
%"/(&3
Danger to life from electric shock when touching live components of the
Sunny String-Monitor.
• Observe the safety rules:
– Disconnect.
– Ensure that the device cannot be reconnected.
– Ensure that no voltage or current is present.
– Cover or safeguard any adjacent live components.
• Maintenance must only be carried out when the device has been turned off and is dead.
• Only open the isolation terminals when the device is off.
• Only unplug the DC connector when the device is off.
5. %"/(&3
Danger to life from electric arcs when opening isolation terminals.
• Open the isolation terminals. Only do this when the Sunny String-Monitor is switched off.
6. %"/(&3
Danger to life from electric arcs when removing the DC connectors.
• Open all DC connectors. Only do this when the Sunny String-Monitor is switched off.