Guidelines for Arranging the Device in the Cabinet or a Machine

Guidelines for Arranging the Device in the Cabinet or a Machine

EMC Domain Sensitive and interfering electrical components and cables must be kept separate. This is possible by housing them in separate cabinets or by using shielded partition panels. The cabinet must be divided into EMC domains:  Areas of different interference levels (EMC domains) must be made in the cabinet. This means that sources of interference and susceptible equipment must be kept separate.  The EMC domains must be decoupled. NOTE: For machines: NC controllers, PLCs and drives can be installed in a cabinet or machine housing under the following circumstances:  The drive cable must be shielded.  The guidelines for cabling must be observed, see Cabling, page135 .

Isolation of Inductances Isolation by using partition panels is necessary for the part of the cabinet where sources of inductance are mounted. The partition panel must have a good connection to the cabinet (ground). Examples of such sources of inductance are:  Transformers  Valves  Contactors

Example: EMC domains separated by partition panels Example for setting up small cabinets: partitioning using partition panels that are connected to ground at several points, reduces interference influences

Solution: EMC domains in two cabinets Example for setting up large cabinets: A separate cabinet is provided for the power and control sections; cable connections are made in a metal cable channel: