3 Product Overview
SMA Solar Technology AG
User Manual 17SCCPXT-E7-BA-en-58
Position Device Description
D DC switchgear The DC switchgear disconnects the inverter from the PV array.
E SC-COM The SC-COM is the communication unit of the inverter. The SC-COM estab-
lishes the connection between the inverter and the system operator.
F AC disconnection unit The AC disconnection unit disconnects the inverter from the MVtrans-
former.
3.3 Operating and Display Elements
3.3.1 Function of the Switches
3.3.1.1 Key Switch
The key switch is used to switch the inverter on and off.
Figure 3: Switch positions of the key switch
Position Designation
A
Switch position Stop
B
Switch position Start
Switch position "Start"
If the key switch is turned to Start, a motor drive switches the DC switchgear on and the inverter switches from the
operating state "Stop" to the operating state "Grid monitoring". Provided that there is sufficient irradiation and a valid
utility grid connection, the inverter switches to feed-in operation. If there is insufficient irradiation and the input voltage
is therefore too low, the inverter remains in the operating state "Grid monitoring".
Switch position "Stop"
If the key switch is turned to Stop while the inverter is in the operating state "Grid monitoring", a motor drive switches
the DC switchgear off. The inverter switches to the operating state "Stop". If the key switch is turned to Stop while the
inverter is in the operating state "MPP load operation", the inverter switches to the operating state "Shutdown". Once
shutdown is complete, the AC disconnection unit and the DC switchgear are opened automatically and the inverter
switches to the operating state "Stop".
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