Lenze 8400 - Manual (Page 166)

Electrical installation
Installation according to EMC (installation of a CE-typical drive system)
Shielding
6
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166 EDS84ASC552 EN 9.1
6.2 Installation according to EMC (installation of a CE-typical drive system)
Design of the cables
ƒ It is imperative to comply with the regulations concerning minimum cross-sections
of PE conductors. The cross-section of the PE conductor must be at least as large as
the cross-section of the power connections.
ƒ The cables used must comply with the approvals required for the location (e.g. UL).
6.2.1 Shielding
Requirements
ƒ The effectiveness of a shielded cable is reached by:
– Providing a good shield connection through large-surface shield contact.
– Using only braided shields with low shield resistance made of tin-plated or
nickel-plated copper braid.
– Using braided shields with an overlap rate > 70 % and an overlap angle of 90 °.
– Keeping unshielded cable ends as short as possible.
Use system cables or shielded cables for these connections:
ƒ Motor
ƒ Feedback systems
ƒ Motor holding brake (shielding is required when being integrated into the motor
cable; connection to optional motor brake control)
ƒ Motor temperature monitoring
ƒ Analog signals (inputs and outputs; single-sided shield connection to the controller)
ƒ System bus (CANopen)
The following connections need not be shielded:
ƒ
24-V supply
ƒ Digital signals (inputs and outputs).
– We recommend to use shielded cables for a cable length from approximately 5 m
on or in environments with strong interferences.
Connection system
ƒ Connect the shield with a large surface and fix it with metal cable binders or a
conductive clamp.
ƒ Connect the shield directly to the corresponding device shield sheet.
– If required, additionally connect the shield to the conductive and earthed
mounting plate in the control cabinet.
– If required, additionally connect the shield to the cable clamp rail.