SMA
Technologie AG
Safety Instructions
Installation manual
SC-100-13:SE2407
Page 11
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.
The protective ground connection must be made before the external
voltage is switched on!
The nominal voltage, frequency and right-hand rotary field are
maintained at the AC grid connection.
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
Dangerous accidental-contact voltages can be present in the device even
when the main AC and DC switches are switched off!
