SMA SC 100 Indoor Installation - Manual (Page 12)

Safety Instructions SMA Solar Technology AG
12 SC-100-IEN093231 Installation Guide
3.10 Commissioning, Maintenance and Repair
All work on the Sunny Central may only be performed when the device is safely disconnected from
the PV voltage, the grid voltage, and the internal power supply, when these power sources are
secured against being switched on again, and when it has been checked that the device is voltage-
free. Only qualified technical personnel, who are familiar with the operation of the system, may
undertake any such work.
3.11 Power Supplies
Switching on of the external power supplies
• Grid voltage for the grid feed-in
• Grid voltage for control voltage (internal power supply). There is the option of feeding it
externally.
• DC voltage from the photovoltaic generator must occur in the sequence described and may only
be performed when the following conditions are satisfied:
• All connections have been made according to the installation guide and the wiring diagram.
• The protective ground connection for grid feed-in and for internal power supply has been made.
• The device is switched off. This means that the Start/Stop switch is in the “Stop” position and
the main switches are off.
• The Plexiglas covers are mounted, to ensure protection against accidental touching.
• The nominal voltage, frequency and the right-hand rotary field are maintained (see device
technical data).
• The polarity of the DC voltage at the inputs / fuse inputs (device dependent) has been checked.
• The photovoltaic generator has been checked with an insulation test to ensure that there is no
ground fault.