SMA
Technologie AG
Electrical Connection
Installation manual
SC-100-13:SE2407
Page 27
7.1.2 AC Control Voltage Connection (Optional)
The 1 x 230 V power required for driving the internal circuits of the Sunny Central
SC100 is taken internally from the grid-feed-in line of the inverter. This reduces the feed-
in energy yields by the amount of power required by the inverter itself (fans, heating
etc.).
The energy required for driving the Sunny Central SC100 Outdoor can be provided
optionally from an external source. The connection to the control voltage supply is
made 1-phase to a
TN-S grid connection
. The standard bridges in the connection
terminal strip, as shown in the wiring diagram, must therefore be removed and the
separate supply cable must be connected.
In doing so, please note that the external supply cable should also be protected against
lightning and overvoltage. This can be ordered optionally.
The connection of an external control voltage supply is established on 3 x 2.5 mm²
spring-type terminals.
When an external control voltage supply cable is connected, the lightning
and overvoltage protection at this voltage input is rendered useless! See
section 7.1.8 Lightning and Overvoltage Protection
