Lenze 8400 motec Manual - Manual (Page 56)

Installation
Installation according to EMC (installation of a CE−typical drive system)
Shielding
5
l
56 EDS84DG752 EN 4.0
5.2 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).
5.2.1 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 External brake resistor (
, Mounting Instructions of the brake resistor)
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 Fieldbus communication (e.g. CANopen, PROFIBUS, ...)
ƒ Safety system
The following connections need not be shielded:
ƒ Mains
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 Extensively apply shielding directly in the plugs.
ƒ Apply shielding above EMC cable glands.