Lenze 8400 protec, Руководство по оборудованию

Страница: 112 / 198

Electrical installation − EMS version
Installation according to EMC (installation of a CE−typical drive system)
Shielding
7
112
EDS84DPS424 EN 5.0
7.4 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).
7.4.1 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
Fieldbus communication (e.g. CANopen)
ƒ
Serial interfaces (e.g. SSI, RS485/422)
The following connections need not be shielded:
ƒ
Mains
ƒ
24 V supply for motor holding brakes
ƒ
Digital signals (inputs and outputs). From a cable length of approx. 5 m onwards, we
recommend to use shielded cables.
Connection system
ƒ
Directly apply the shielding in the plug.
– Extensively apply the shielding and ensure electrical conductivity.
– If required, additionally connect the shield to the cable clamp rail.