SMA SC 100 Indoor Installation - Manual (Page 29)

SMA Solar Technology AG Electrical Connection
Installation Guide SC-100-IEN093231 29
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.
NOTICE!
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.