Mounting And Grounding The Racks - Siemens S7-400 Installation Manual

Installing the S7-400
2.5

Mounting and Grounding the Racks

Important Notes on Installation
The S7-400 racks are designed for wall mounting, mounting on rails, and for
installation in frames and cabinets. Their mounting dimensions comply with
DIN 41 494.
According to the UL/CSA and the EU Directive 73/23/EEC (low-voltage directive),
installation in a cabinet, a casing, or a closed operations room is necessary in order
to fulfil the requirements for electrical safety (see Reference Manual , Chapter 1).
In principle, the M7-400 is mounted like an S7-400 except that preassembly is
required (see Section 8.4 "Installing the M7-400").
Step 1: Retaining Distances Between Devices
You must observe the minimum distances between the rack and neighboring
devices. You need these minimum clearances during installation and operation.
• For fitting and removing modules
• For fitting and disconnecting the module front connectors
• To ensure the air flow required for cooling the modules during operation
The following figure shows the minimum space you must provide for a rack.
352 mm
*
40 mm facilitates the mounting of a fan subassembly
Mounting depth, fitted: max. 237 mm
2-10
40 mm
1 2 3 4 5 6 7
20 mm
*
22 mm
522.5 mm (18 slots)
297.5 mm ( 9 slots)
172.5 mm (4 slots)
S7-400 and M7-400 Programmable Controllers Hardware and Installation
8 9 10 11 12 13 14 15 16 17 18
20 mm
A5E00069481-04