Electrical installation
96
Connection procedure
WARNING! Follow the instructions in chapter Safety instructions. Ignoring the
instructions can cause physical injury or death, or damage to the equipment.
1. Disconnect the inverter cubicle from the DC supply (open the DC switch or
remove the fuses). Ensure by measuring that the drive is dead.
2. Open the door of the inverter module cubicle: Unlock the handle, release it from
the holder and turn upwards to release the door locking mechanism.
3. Remove the shroud that protects the output busbars and cable entries.
4. Remove the cooling fans. See Replacing the inverter module fans (2×R8i and up)
on page 126.
5. Lead the cables into the inside of the cubicle. For minimum radio frequency
interference and motor bearing current, ground the cable shield 360° at the lead-
through.
6. Connect the cables as follows:
- Cut the cables to suitable length. Strip the cables and conductors. Fasten the
cable lugs to the conductor ends.
- Twist the cable shields into bundles and connect to cabinet ground busbar.
- Connect the phase conductors to the output terminals. See the appropriate
connection diagram above.
- Tighten the phase conductors and PE to 70 N·m (50 lbf·ft).
7. Refit the fans.
8. Refit the shroud removed earlier and close the door.
9. Connect the motor end of the cable (see the diagrams above). For minimum radio
frequency interference and motor bearing current ground the cable shield 360° at
the lead-through of the motor terminal box, or ground the cable by twisting the
bare shield so that its width, when flattened, is at least 1/5 times its length (see
the drawing below). For motor-specific instructions, see its documentation.
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