SMA SSM-U-1615 - Manual (Page 42)

6.8 Installation of the String Cables
6.8.1 Requirements for Installation of the String Cables
Requirement:
☐ Apart from installation of the string cables, all other installation work must be completed.
Requirements for the PV modules per input:
☐ The thresholds for the input voltage and the input current of the DC subdistribution must be
adhered to (see Section 13, page 65).
☐ On the coldest day based on statistical records, the open-circuit voltage of the PV array must
never exceed the maximum input voltage of the DC subdistribution.
☐ The positive connection cables of the PV modules must be fitted with the positive DC
connectors (for information on assembling DC connectors, see the DC connector installation
manual).
☐ The negative connection cables of the PV modules must be fitted with the negative DC
connectors (for information on assembling DC connectors, see the DC connector installation
manual).
Use of Y adapters for parallel connection of strings
The Y adapters must not be used to interrupt the DC circuit under load.
• In order to interrupt the DC circuit, disconnect the DC subdistribution from all voltage
sources (see Section 8.2, page 47).
6.8.2 Installing the String Cables
The SMA String-Monitor is supplied with string cable harnesses and DC connectors fitted at the
factory.
Danger to life due to electric shock from live PV voltage
As soon as the string cables are connected, the electronic assembly and other voltage-carrying
components will be energized. Touching live components results in death or serious injury due to
electric shock.
• Wear suitable protective equipment for all work.
• Do not touch any live components.
• Always install string cables right at the end of the installation work.
6 Installation SMA Solar Technology AG
Operating Manual SSMUXX15-BE-en-10 42