Hopewind hopeSun 10KTL, User Manual

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3 System installation
21
3.6.3 Torque requirements
When tightening the cable connection, the tightening torque needs to meet the requirements
of the following table.
Table 3-1 List of tightening torques for threaded connections
Thread
spec
Performance grade 4.8 Performance grade 8.8
Unit
Common
Connection
High density
connection
Common
Connection
High density
connection
M3 6 8 kgf.cm
M4 12 14 kgf.cm
M5 25 30 kgf.cm
M6 50 60 kgf.cm
M8 110 150 kgf.cm
M10 300 390 kgf.cm
M12 550 650 kgf.cm
M16 1600 2000 kgf.cm
Note: All bolts with a nominal diameter of 8mm or more in the string inverter of our company are 8.8 Dacromet
bolts.
3.6.4 Preparation before operation
1. When connecting the cable, it is forbidden to operate in electricity, and observe the relevant requirements
in "1 Safety Precautions".
2. Before connecting the cable, please complete the following preparations to avoid personal injury.
1)
Make sure that the “DC SWITCH” of the inverter is in the “OFF” state, otherwise the high voltage of
the inverter may cause electric shock.
2) Confirm the positive and negative poles of the input cable and mark them well. Make sure that the
input cable is disconnected from the PV array (make sure that the cable is not live when crimping the
input MC4 terminal).
3) Confirm that the open circuit voltage of the PV array does not exceed the specified limit.
3. When connecting the input cable, make sure that the positive and negative poles of the input cable
correspond to the positive and negative poles of the PV terminals of the string inverter.