Arranging The Grounding Inside The Cabinet; Selecting The Busbar Material And Preparation Of The Joints; Tightening Torques; Planning The Fastening Of The Cabinet - ABB ACQ810-04 Hardware Manual

34 Planning the cabinet installation

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
If planning the use of busbars, note the following:
•
Tin-plated copper is recommended but aluminium can also be used.
•
The oxide layer from aluminium 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.
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)

Planning the fastening of the cabinet

Note the following when planning 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 may
damage electronic circuits in the cabinet.