Siemens ET 757 E Series Instrucciones de operaciones descargar pdf (Pagina 40)

Installation

4.2 Mounting the racks

ET 200pro FC

40 Operating Instructions, 11/2007, A5E01100763B AA

Accessories required

Table 4-3 Rack and grounding cable

For... you can use ... Explanation

M8 cylindrical head screw

according to

ISO 1207/ISO 1580

(DIN 84/DIN 85)

Outer fixing screws

Hexagonal head screw, M8,

according to ISO 4017 (DIN

4017)

Choose a suitable screw length

for your configuration. You also

need 8.4 mm washers

according to ISO 7092 (DIN

433)

Grounding cable Insulated cable, conductor

cross-section: min. 4 mm

)

You also need an M8 ring cable

lug and an M8 spring lock

washer

Mounting the rack and connecting functional ground

1. If necessary, mark the mounting holes on the mounting base, then drill holes with

diameter of 8.5 mm

±0.2

mm.

2. Screw-mount (M8 screws) the rack onto the carrier.

3. Strip the grounding cable (Cu strip, for example) for your functional earth (FE) to a

suitable length, then crimp an M8 lug onto the conductor.

4. Fasten the grounding cable using one of the bore holes of the rack: Slip the spring lock

washer, the washer and the cable lug onto the mounting screw, then screw the rack onto

the carrier.

5. Connect the opposite end of the grounding cable to ground potential.

Note

Ensure adequate equipotential bonding.

Figure 4-3 Grounding the wide rack

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Siemens ET 757 E Series Instrucciones de operaciones Pagina 40