Communication Cable Connection - CanadianSolar CSI-75K-T40001-E Quick Installation Manual

4.2.1 Additional Grounding Requirements
All non-current carrying metal parts and device enclosures in the PV power system should be grounded, for example, brackets
of PV modules and inverter enclosure. When there is only one inverter in the PV system, connect the additional grounding
cable to a nearby grounding point.
When there are multiple inverters in the PV system, connect grounding points of all inverters and the PV array frames to the
equipotential cable (according to the onsite conditions) to implement an equipotential connection.
4.2.2 Connection Procedure
Step 1: Prepare the cable and terminal.
Step 2: Remove the screw on the grounding terminal and fasten the cable with a wrench.
Step 3: Apply paint to the grounding terminal to ensure corrosion resistance.
L2=L1+3mm L3=2L1
L1
M8
8.4 ≤ D ≤ 12.5mm
8N.m
FIG 4-2 PE cable installation
The grounding screws have been anchored to the side of the inverter before delivery, and
do not need to be prepared.

4.3 Communication Cable Connection

4.3.1 Opening the Wiring Compartment
Step 1:Loosen four screws on the front cover of the wiring compartment with screwdriver T30.
Step 2:Open the wiring compartment.
Step 3:Loosen the screws on the communication protection cover, and remove the protection cover.
Close the wiring compartment in reverse order after completing wiring operations.
Note:
M4
M6
PH2
T30
FIG 4-3 Open the Wiring Compartment
4.3.2 Communications Interface Description
FIG 4-4 shows the position of the communication wiring board in the inverter and the terminals of this board.
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EN-Rev 75-120kW QI/V03a December, 2023. CSI Solar Co., Ltd.