Lenze 712 E.3B - Handbuch (Seite 55)

Electrical installation
EMC-compliant installation
Installation of a CE-typical drive system
5
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55 EDB712 DE/EN 2.1
Shielding
ƒ Shield all wires from and to the drive controller.
– Connect the shield on the motor cable to the mounting plate near the
drive controller using a large area connection. Use earthing clamps on
bare metal mounting surfaces.
– Also connect the shields on the cables connected from contactors,
motor protection switches or terminals in the motor cable to the
mounting plate using large area connections.
– In the motor terminal box, connect the shield and the motor housing
using a metal cable gland to form a large area connection.
– Connect shields on analogue control cables at one end.
– Connect the shield on the control cables at both ends to the mounting
plate using a large area connection.
If the mains cable between RFI filter and drive controller together is longer than
300 mm:
ƒ Shield the mains cables.
ƒ Connect the shield on the mains cables at both ends of the cable to the
mounting plate using large area connections.
Earthing
Drive actuator and RFI filter are metallic and conductive and must be earthed.
ƒ Connect all metal, conductive components to a central earthing point.
ƒ For the wiring use the minimum cross-section specified in the safety
regulations.
Layout
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Note!
For EMC it is not the cable cross-section that is of importance, but
the size of the contact area between the drive controller, RFI filter
and mains choke and the earthed mounting plate.
The use of electrically conductive mounting plates (e.g. zinc-coated) ensures a
permanent safe contact.
ƒ Remove the paint from the mounting areas if you use painted mounting
plates.
ƒ Connect mounting plates e.g. together using copper strips and large area
connections if you use several mounting plates.
ƒ Connect the shields correctly.