Siemens S5-155U System Manual page 67

Selection and Installation of Cabinets with SIMATIC S5
Upper Subrack
S5-135U/155U
or
S5-115U
or
S5-90U/95U/100U
3 - 38
Where subracks (CC and EU) are arranged one above the other, the
installation clearances in the following table must be observed.
Lower Subrack
S5-135U
S5-115U with fan
S5-115U without fan
S5-90U/95U/100U
The following two points should be observed to improve the air
circulation within the cabinet:
• • The expansion unit with the greatest power dissipation to be
removed should be the upper unit.
• • If subracks of the S5-135U/155U series are installed together with
subracks of the S5-90U to 115U series in one cabinet, the rear
panels of all subracks must be at the same distance from the rear
wall of the cabinet.
Min. Clearances Max. Clearances
75 mm The maximum clearance
87 mm if baffle is is limited by the lengths of
connecting cables for the
used
interface modules.
60 mm
100 mm
75 mm
C79000-B8576-C199-03
System Manual