Siemens SIMATIC PANEL PC 877 - Manual (Page 32)

Application planning
4.4 Mounting Positions and Fastening
SIMATIC Panel PC 877
4-8
Operating instructions, Release 07/2006, A5E00877780-01
4.4.4 Protection against dust and water
Principle
The degree of protection provided at the front is assured when the mounting seal lies
completely against the mounting cut-out.
Caution
Please ensure that the material strength at the mounting cut-out is a maximum of 6 mm.
Please follow the specifications for the dimensions in the "Mounting cut-out" section.
The degrees of protection are only guaranteed when the following is observed:
•
The material strength at the mounting cut-out is at least 2 mm.
• The surface plane deviation of the mounting cut-out in relation to the external dimensions
of the control unit amounts to ≤ 0.5 mm when the control unit is mounted.
IP65 degree of protection and NEMA4
IP65 degree of protection and compliance with the NEMA4 regulations are only ensured
when clamp mounting together with a ring seal.
IP54 degree of protection
This degree of protection is achieved for screw fixing of all operator control units with a key
front panel and the 15" and 19" operator control units with a touch front panel. This degree of
protection is assured for the 19" operator control unit with a touch front panel when the
mounting components for 19" rack accessories are used.
Note
For screw fixing of the 19" touch panel front, a backing plate is available as an accessory.
For further information, see "http://mall.ad.siemens.com/".