Siemens EF 837 Series Especificaciones descargar pdf (Pagina 15)

3BSE056248 15

Section 2 Installation

Mounting AC 800M and S800 I/O Units onto DIN-Rail

AC 800M and S800 I/O units are DIN-rail mountable. Each unit has a DIN rail

locking mechanism that achieve mechanical locking and effective grounding.

The additional screw lugs, located in the lower part of the units are used to provide

extra fastening in environments subject to excessive vibrations. AC 800M units

(CPU and communication interfaces) must be mounted on horizontal DIN rails.

S800 I/O units can be mounted on both horizontal and vertical DIN rails.

There are two ways of mounting AC 800M and S800 I/O in cabinets, open rack or

other types of installations:

• Mounting on DIN rail attached to a metal sheet

• Mounting on prefabricated aluminium profile with DIN rail

All conductive structural components of the installation must be bonded together

with good and permanent connections for electrical safety and EMC reasons.

The bonding should preferably be made with self-tapping cutting head screws.

On painted surfaces where fastening is done by screw and nut, the paint must be

removed from the contact surfaces. Apply conductive grease on surfaces to ensure a

permanent connection. The cabinet/rack shall be properly connected to protective

earth/ground.

Mechanical Installation - Metal Sheet

The DIN-rail is mounted on an unpainted metal sheet with fastening screws every

100 mm to ensure good mechanical stability and a good chassis ground connection

in the cabinet or an open rack, see Figure 3.

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Siemens EF 837 Series Especificaciones Pagina 15