Siemens S5-135U/155U - Manual (Page 73)

4-7
System Manual
C79000-G8576-C199-06
An air supply as shown in the following illustration must be ensured.
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Heat Sink
Exhaust air
Additional PLC or EU
Baffle
Rear Panel
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Bus Connector
Bus PCB
Guide Rail
d
1)
Supply air
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Locking Bar
Cable
Duct
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Fan
Shield
Filter Subdrawer
Exhaust
air
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Exhaust
air
Figure 4-3 Air Supply to the Central Controller
1) d: Clearance > 87 mm when a baffle is used
d: Clearance > 89 mm when a filter subdrawer is fitted
d: Clearance > 75 mm without filter subdrawer
Central Controllers and Expansion Units Power Supply Units