SMA SC 500HE-20 Maintenance Manua - Manual (Page 51)

SMA Solar Technology AG 7 Maintaining the Accessories
Maintenance Manual SC500-800HE20-WH-en-10 51
7.3 Maintaining the SMA String-Combiner
7.3.1 Disconnecting the SMA String-Combiner
1. If there is a DC switch-disconnector in the SMA String-Combiner, disconnect it. This ensures that
there is no current flowing through the SMA String-Combiner.
If there is no DC switch-disconnector, disconnect the Sunny Central (see the Sunny Central
installation manual).
2. If there are fuses in the Sunny Central, remove them. Use an LV/HRC fuse handle to do this.
3. If the central inverter is equipped with the "Optiprotect" option, switch the miniature
circuit-breakers in the central inverter off.
4. If there are no fuses in the Sunny Central, remove the fuses from the DC main distributor.
5. Only open the fuse holder in the SMA String-Combiner when it is switched off.
6. Disconnect all DC connectors.
7.3.2 Maintenance Interval
• Service the SMA String-Combiner every 24 months.
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Danger to life due to electric shock.
High voltages are present in the live components of the SMA String-Combiner.
• Disconnect the SMA String-Combiner before carrying out any work:
– Turn off the DC switch-disconnector in the SMA String-Combiner.
– Remove the DC fuses on the central inverter after switching it off. Use an LV/HRC fuse
handle to do this.
– If the central inverter is equipped with the "Optiprotect" option, switch the miniature
circuit-breakers in the central inverter off.
– Only open the fuse holders in the SMA String-Combiner when it is switched off.
– Only plug in or unplug the DC connector when it is switched off.
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Risk of burns from touching hot components.
• Wear safety gloves when working on the device.