ABB ACS880-04F, Руководство по оборудованию, Страница: 41 / 172

Guidelines for planning the mechanical installation 41
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:
•
Tin-plated copper is recommended but aluminum can also be used.
•
The oxide layer from aluminum busbar joints must be removed and suitable anti-
oxidant joint compound applied.

Tightening torques
Apply the following torques to grade 8.8 screws (with or without joint compound) that
tighten electric contacts.

Planning the fastening of the cabinet
Note the following when you plan the fastening of the cabinet:
•
Fasten the cabinet to the floor from the front and to the floor or wall from the back.
•
Always fasten the drive module from its fastening points to the cabinet. For details, see
the module installation instructions.
WARNING! Do not fasten the cabinet by electric welding. ABB does not assume
any liability for damages caused by electric welding as the welding circuit can
damage electronic circuits in the cabinet.

Planning the cabinet placement on a cable channel
Note the following when you plan to place the cabinet on a cable channel:
•
The cabinet structure must be sturdy enough. If the whole cabinet base is not
supported from below, the cabinet weight will lie on the sections that the floor carries.
•
Equip the cabinet with a sealed bottom plate and cable lead-throughs to ensure the
degree of protection and to prevent the cooling air flow from the cable channel into the
cabinet.
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)