Installation Manual
31
Connect cables strictly according to the wiring marks on the device.
Open/Close the DC switches strictly according to the internal identifications.
7.8.3
DC Side Cable Connection
Proceed as follows to connect the DC side cables.
Step 1
Ensure that output circuit breakers of all upstream combiner boxes of the inverter have
been disconnected.
Step 2
Strip off the insulation on the end of the cable. The stripped length should be about 5 mm
longer than the depth of the cable lug.
Step 3
Crimp the cable lug. It is recommended to use a DT-70 cable lug considering the selected
cable specification.
1.
Insert the stripped copper cable into the cable lug.
2.
Crimp the cable lug by using the crimper. Crimping number should be more than 2.
Step 4
Insert the heat-shrinkable tubing.
1.
Select an appropriate heat-shrinkable tubing according to the cable specification,
where the heat-shrinkable tubing should be 2 cm longer than the depth of the cable
lug.
2.
Insert the cable lug into the heat-shrinkable tubing to completely cover the crimping
hole on the cable lug.
3.
Shrink the tubing with a hot air blower.
Cable protectors are recommended in the cable crosses if multi-core cables are
used.
Step 5
Connect the cables.
1.
Select bolts matching the cable lug, with M12
×
40 recommended.
2.
Attach the cable lug to the DC copper bus bar.
3.
Proceed as follows to fasten the bolts by using the screwdriver or the spanner with
torque of 60 to 70N
m.
A
C
D
E
D
E
F
B
A
C
D
E
D
E
F
B
A
B
C
D
E
F
Copper
bus bar
Copper
connection
terminal /
Cu-Al transition lug
Bolt
Spring washer
Flat
washer
Nut
Considering the design of the copper bus bar, it is recommended to connect the
cables from inside to outside.
