Arranging The Grounding Inside The Cabinet; Selecting The Busbar Material And Preparation Of The Joints; Tightening Torques - ABB ACS880 Series Supplement Manual

28 Guidelines for planning the cabinet installation
Roof air flow viewed from top:

Arranging the grounding inside the cabinet

Arrange the grounding of the drive module by leaving the contact surfaces of the
fastening points unpainted (bare metal-to-metal contact). The module frame will be
grounded to the PE busbar of the cabinet via the fastening surfaces, screws and the
cabinet frame. Alternatively, use a separate grounding conductor between the PE
terminal of the drive module and the PE busbar of the cabinet.
Ground also the other components in the cabinet according to the principle above.

Selecting the busbar material and preparation of the joints

Note the following when you use busbars:
• We recommend tin-plated copper but you can also use aluminum.
• Remove the oxide layer from aluminum busbar joints and apply suitable anti-
oxidant joint compound.

Tightening torques

Use these torques to grade 8.8 screws (with or without joint compound) that tighten
electric contacts:
Screw size Torque
M5 3.5 N·m (2.6 lbf·ft)
M6 9 N·m (6.6 lbf·ft)
M8 20 N·m (14.8 lbf·ft)
M10 40 N·m (29.5 lbf·ft)
M12 70 N·m (52 lbf·ft)
M16 180 N·m (133 lbf·ft)