Sungrow SG2K5TL, User Manual

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SG2K5TL/SG3KTL/SG4KTL-31
User Manual
34
6.4.2
Wiring Procedures
Make sure that all the DC and AC cables to the inverter are no live before you
start the electrical work.
Connect the inverter to PV array as the following procedures:
1. Manually rotate the DC switch at the bottom to the “OFF” position.
2. Check the connection cable of PV string for the correct polarity and that the open
circuit voltage does not exceed inverter input limit 500V, even under the lowest
operating temperature. Refer to module specification supplied by module
manufacturer.
3. Measure the DC voltage between the positive terminal of the PV string and Earth
and the DC voltage between the negative terminal of the PV string and Earth. If the
two voltages are constant and not zero, there is an insulation failure somewhere in
this PV string. Solve the insulation failure if required.
4. Plug the positive and negative DC connectors into corresponding terminals until
there is an audible sound.
5. Connect other two PV strings in the same procedures if necessary. Unused DC
terminals should be sealed.