ABB ACS880-304 +A018, Hardware Manual

Page: 103 / 280

Electrical installation 103
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Connection procedure
WARNING! Only qualified electricians are allowed to do this work. Read the
complete safety instructions of the drive. Ignoring the instructions can cause
physical injury or death, or damage to the equipment.
1. Disconnect the drive from the AC power line and make sure it is safe to start the work.
Obey the instructions in section Basic electrical safety precautions on page 96 .
2. Make the connections in between the main circuit components inside the cabinet if not
done yet. Do the connections according to the final circuit diagrams for the drive. If the
connections are ready, check them against the final circuit diagrams. Do not use the
example circuit diagrams in this manual as the sole source of information when doing
or checking the connections.
For the tightening torques, see section
Tightening torques (N·m / lbf·ft) on page 230 .
3. Ground the modules by the top edge of the front plate. The grounding point is marked
on the module. Connect the front plate to the frame support bracket with screws. The
frame support bracket should have a galvanic connection to the PE busbar through
the cabinet frame.
Note: If the cabinet frame is painted (for example, Rittal TS 8 enclosures), it is
important to make sure that a good galvanic connection to ground (PE busbar) is
achieved. You can, for example, remove the paint from the connection points and use
star washers.
Note: The connection to ground merely through the mounting screws and the cabinet
chassis is not always good enough. To ensure the continuity of the protective bonding
circuit, you can connect the modules to the cabinet PE busbar with a copper busbar or
cable. The inductance and impedance of the PE conductor must be rated according to
permissible touch voltage appearing under fault conditions (so that the fault point
voltage will not rise excessively when a ground fault occurs). See
Electrical planning
instructions for ACS880 multidrive cabinets and modules (3AUA0000102324
[English]).
4. Lead the input power cables into the inside of the cabinet.
5. Strip the input power cables and twist the cable shields to bundles and connect to
cabinet PE (ground) busbar. Connect the separate ground conductors/cables to
cabinet PE (ground) busbar. We recommend also 360° grounding of the cable shield
at the lead-through to suppress interference. See the illustration below.
6. Connect the phase conductors to the input terminals of the main switch-disconnector
[Q1] or the main breaker [Q1].
For the tightening torque, see section
Tightening torques (N·m / lbf·ft) on page 230 .