Connection procedure
WARNING!
Read and follow the instructions given in Safety instructions for ACS880
multidrive cabinets and modules (3AUA0000102301 [English]). Ignoring
the instructions can cause physical injury or death, or damage to the
equipment.
1. Ground the inverter 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 bracket should have a galvanic connection to the PE busbar through the cabinet
frame.
Note:
• If the cabinet frame is painted (such as with Rittal 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.
• 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]).
2. Run the output (motor) cable into the cubicle through a cable gland or grommet. 360°
grounding of the cable shield is recommended to suppress interference. In case a
grounding cable gland is available, remove the outer jacket of the cable where it passes
through the cable gland.
3. Cut the output cable to suitable length and strip the ends of the individual conductors.
4. Twist the shield strands of the output cable together to form a separate conductor and
wrap tape around it as shown.
5. Crimp suitable cable lugs to the conductors as well as the twisted shield. Connect the
phase conductors to the output busbars. Connect the cable shield to a PE busbar.
152 Electrical installation
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