Siemens S5-155U System Manual page 79

Exhaust
air
Rear Panel
Bus Connector
Bus PCB
Heat Sink
Exhaust air
Additional PLC or EU
Figure 4-3 Air Supply to the Central Controller
System Manual
C79000-B8576-C199-03
An air supply as shown in the following illustration must be ensured.
Exhaust
air
+
+
Shield
+
+
Supply air
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
S5-135U/155U Central Controller
Locking Bar
Guide Rail
Cable
Duct
Fan
Filter Subdrawer
Baffle
4
1)
d
4 - 9