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Grounding
• Ground all conductive metal components (controllers, RFI filters, mains
chokes) by suitable cables from a central grounding point
(PE bar).
• Observe the minimum cross-sections prescribed in the safety information.
However, for EMC the surface of the contact is important and not the cross-
section.
Assembly
• Make a contact from controller, RFI filter, and mains chokes to the grounded
mounting plate with as large a surface as possible. Zinc-coated mounting
plates allow long-lasting contacts. For painted plates the paint of the
mounting plates must be removed in all cases.
• If you use several mounting plates:
− Make a conductive connection of the mounting plates with as large a
surface as possible (e.g. using copper bands).
• Connect the screen of the armature and field cable to the mounting plate with
as large a surface as possible:
− Recommendation: Make the large-surface connection of the screens to the
mounting plate with earthing clamps on bare metal mounting surfaces.
• If there are contactors, motor protection switches, or terminals in the
armature cable:
− Contact of the screens of the connected cables to each other and to the
mounting plate with as large a surface as possible.
• In the terminal box, connect the screen of the motor to PE:
− Metal cable glands at the motor terminal box ensure a large-surface
connection of the screen to the motor housing.
• If the total length of the mains cable between RFI filter and mains chokes and
controller exceeds 200 mm:
− Screen mains cables
− Connect the screen of the mains cables to the mounting plate with as large
a surface as possible.
• Connect the screen of the control cables to the mounting plate with as large a
surface as possible.
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