Installation and EMC guidelines
1.13 Power losses in the control cabinet
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
29
Power losses in the control cabinet
The dissipation capability of a cabinet and therefore the air intake temperature of the rack
depends on the type of cabinet, on the ambient temperatures and on the internal
arrangement of the devices.
Control cabinet (open) with
open
-circuit ventilation
Cabinet (closed) with
intrinsic convection and
forced convection
Closed cabinet with
heat e
xchanger
For installation variants 1) and 2), it is presumed that there is a clearance of at least 1 meter
between the top of the control cabinet and the building's ceiling.
Using the SHUTDOWN MODE switch the user can select whether to shut down the rack
immediately on failure of the first fan, or not until an additional fan failure.
Shutdown is initiated upon the failure of one fan
TWO / OFF Shutdown is initiated upon the failure of one or more fans
For additional rack-specific information see:
UR6021 (6DD1682-0CH3) Control and display elements (Page 41)
UR5213 (6DD1682-0CH2)
Control and display elements (Page 55)
UR5213 (6DD1682-0CH0)
Control and display elements (Page 67)
Note
In the SHUTDOWN MODE, the internal output voltages of the rack are switched off. External
voltages connected to the module input must be switched off simultaneously (refer to section
Machinery directive
(Page 17)).
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