SMA SC 100 Indoor Installation - Manual (Page 14)

Safety Instructions SMA Solar Technology AG
14 SC-100-IEN093231 Installation Guide
3.12 Disconnect
External insulation of the device must always occur under load-free conditions. The device must be
switched off in order to do this. This means that the key switch must be in the “Stop” position.
The following power supplies must be isolated:
• Grid voltage for the grid feed-in
• Grid voltage for internal power supply (optional)
• DC voltage from the photovoltaic generator
Simply switching off the main AC and DC switches is not sufficient to ensure proper insulation of the
device. The main switches only separate the power circuit from the grid and the photovoltaic
generator.
NOTICE!
The nominal voltage, frequency and right-hand rotary field are maintained at the AC grid
connection.
DANGER!
The cabinet must remain closed when connecting the supplies!
Work on the Sunny Central may be performed only after switching off the power to the
unit. The VDE regulations must be followed.
• Disconnect
• Protect against reenergizing
• Test each unit to ensure that all voltages have been removed
• Ground and short the unit if necessary (not on the DC side)
If necessary, cover or protect against accidental contact with any voltage carrying
components
DANGER!
Dangerous accidental-contact voltages can be present in the device even when the main
AC and DC switches are switched off!
DANGER!
In case of a failure, the DC contactor(s) may carry a life-threatening DC voltage!