SMA STP 10000TL-10 Installation - Manual (Page 37)

SMA Solar Technology AG 6 Electrical Connection
Installation Manual STP10-17TL-IA-en-32 37
Function of the Electronic String Fuse
The electronic string fuse prevents reverse currents in the PV array. Activation of the electronic string
fuse is only possible if the following conditions are met:
• During installation, the DC input voltage must be at least 188 V (see Section 14 "Technical
Data", page 92) in order to activate the protective function of the integrated electronic string
fuse, otherwise, a reversed polarity at the DC connection or a defective string will not be
recognised by the inverter.
6.4.2 Assembling the DC Connectors
For connection to the inverter, all connection cables of the PV modules must be equipped with the
DC connectors provided.
Assemble the DC connectors as follows. Be sure to observe the correct polarity. The DC connectors
are marked with the symbols "+" and " − ".
Cable Requirements
• Use a PV1-F cable.
Risk of fire in the PV array due to non-recognition of reverse currents
The integrated electronic string fuse monitors the PV array and protects it against dangerous reverse
currents. In order to activate the electronic string fuse, you must observe the following during
connection of the strings:
• If more than two strings are connected to the inverter, ALWAYS connect the first string to
input B. If no string is connected at input B, the string fuse will not be active.
• Each string must be clearly assigned to the correct string input. Do not cross-wire or bundle the
string cables. See the diagram in Section 6.4.1 for the correct assignment of the strings.
Use of external string collection boxes
If string collection boxes are used, the functionality of the electronic string fuse may be limited.