ABB ACS800-U7, Hardware Manual

Page: 36 / 148

Mechanical installation
36
Electric welding
It is not recommended to fasten the cabinet by welding.
Cabinets without flat bars at the base (non-marine versions)
If the preferred fastening methods (clamping or bolting through the holes inside the
cabinet) cannot be used, proceed as follows:
• Connect the return conductor of the welding equipment to the cabinet frame at
the bottom within 0.5 metres of the welding point.
Cabinets with flat bars at the base (marine versions)
If the fastening cannot be done using screws, proceed as follows:
• Weld only on the flat bar under the cabinet, not the cabinet frame itself.
• Clamp the welding electrode onto the flat bar about to be welded or onto the floor
within 0.5 metres of the welding point.
WARNING! If the welding return wire is connected improperly, the welding circuit
may damage electronic circuits in the cabinet. The thickness of the zinc coating of
the cabinet frame is 100 to 200 micrometres; on the flat bars the coating is
approximately 20 micrometres. Ensure that the welding fumes are not inhaled.