7.
Connect the grounding wire to the equipment grounding terminal in the DC Safety
Unit.
NOTE
Connect the equipment grounding before connecting the AC wires to the
AC terminal block.
8.
Insert the remaining four wires through the AC conduit to the inverter, and connect
them to the appropriate terminal blocks in the inverter according to the labels on
the terminal blocks (N, L1, L2 and L3).
Figure 34: AC Terminals
9. Tighten the screws of each terminal with a torque of 1.2-1.5 N*m / 0.88-1.1 lb*ft.
10. Check that the wires are fully inserted and cannot be pulled out easily.
11. Tighten the AC cable gland with a torque of 5.0 N*m / 44 lb*in.
12. Verify that there are no unconnected wires.
13. Make sure the SPDs are tightly attached to the DIN rail.
NOTE
If power control is enabled, it is important to respect the order of grid lines
connection to the inverter. A 120deg phase difference should be kept between
L1 to L2 and between L2 to L3 (L1-L2-L3 and not, for example L1-L3-L2).
If the grid lines are not in this order, an error is displayed on the LCD screen
and the inverter will not produce power.
Connecting the Strings to the DC Safety Unit
Up to three strings may be connected in parallel to the DC input pairs of the switch. The
terminals are suitable for connection of copper conductors only.
To connect the strings to the DC Safety Unit:
1. Strip 8 mm of the DC wire insulation.
2. Insert the wires into the DC input glands of the DC Safety Unit .
3.
Connect the DC wires according to the DC+ and DC- labels:
Appendix C: Connecting the AC and DCStrings to the DC Safety Unit 87
Three Phase System Installation Guide MAN-01-00057-4.1
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