SMA SC 100 Indoor Installation - Manual (Page 38)

Commissioning SMA Solar Technology AG
38 SC-100-IEN093231 Installation Guide
8 Commissioning
8.1 Prerequisites
To allow the inverter to be correctly commissioned, the following conditions must be satisfied in
advance before the device is put into operation.
The PV generator must be constructed and tested in compliance with to VDE 0100 part 610 BGV A2
"Electrical Systems and Appliances". The grounding resistance is decisive for the safety of the
complete system and must therefore be determined before the system is started for the first time.
When delivered, all circuit beakers and motor overload switches in the Sunny Central are switched
off.
8.2 Cabling Checks
When performing the cabling checks, the connections are first checked for correctness and proper
installation.
AC Grid Connection
The connection made to the feed-in cables is 3-phase. It must be checked that the inverter is connected
to the correct grid connection type (TN-C, TN-S or TT) and that a right-hand rotary field exists on L1,
L2 and L3. The level of the AC voltage should be measured and logged. The Sunny Central feeds into
the grid using 3 x 400 V (+/- 10 %).
AC Control Voltage Connection (Optional)
The connection made to the feed-in cables is 1-phase. Have the bridges in the connection terminal
strip been removed and has a separate supply cable been connected for the external AC control
voltage? Has the external AC control voltage been connected to the correct grid connection type
(TN-S)?
DC Power Connections
The DC power connections are made over the main DC cables to the inverter. The voltage on the
individual DC main cables should be almost identical and must never exceed the maximum DC
voltage of the inverter.
In addition to the voltage levels, the polarity of the individual DC main cables must also be checked.
The wrong polarity in one of the DC main cables can also damage the PV generator. Again, all DC
connections should be checked to ensure that they are mechanically tight.
NOTICE!
Before starting the device for the first time (commissioning), all work performed on the
device should be thoroughly checked. In particular, the voltages on the DC and AC sides
should be checked for conformance with the limits allowed on the inverter.