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Electrical installation

Installation according to EMC (installation of a CE-typical drive system)

Shielding

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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 c ross-section of the power connections.

ƒ The c ables 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 m ade of tin-plated or

nickel-plated c opper 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.

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Lenze 8400 Manuel d'utilisateur Page 166