Sungrow SG3KTL-EC, Руководство пользователя

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User Manual 5 Electrical Connection
37
PV Connection of Parallel Mode
Connect the inverter to PV arrays according to the following procedures:
1. Rotate the DC switch at the bottom to the “OFF” position.
2. Check the cable connection of PV strings for the correct polarity and that the
open-circuit voltage does not exceed the inverter input limit 1000 V.
3. Plug the positive and negative DC connectors into corresponding terminals
until it click-locks into place.
4. The terminals in DC1 input and DC2 input must be short-circuited by Y-type
cable connector.
5. Connect other PV strings in the same procedures if necessary.
5.6 Grounding the Inverter
Because of the transform-less design of the inverter, DC positive pole and
DC negative pole are not permitted to be grounded. Otherwise the inverter
will not function properly.
5.6.1 Grounding System Overview
All non-current carrying exposed metal parts of the equipment and other
enclosures in the PV power system should be grounded (e.g., PV arrays frame and
inverter enclosure).