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Installation
5.2.3
AFE inverter, construction types E to G
Partition measures
5-4
Mounting surface
350
Side view
Fig. 5-4
Mounting dimension, construction types E, F and G
Door/roof openings
An underpressure is created in the openings of the cabinet doors due to
the flow of air. This is dependent on the volumetric flow and the
hydraulic cross-section of the openings.
The flow causes a build-up (over) pressure in the roof or in the top
cover.
As a result of the difference in pressure between the overpressure at
the top and the underpressure at the bottom of the cabinet, a flow of air
is created inside the unit, a so-called arcing short-circuit. This can be
stronger or weaker depending on the volumetric flow and the door/roof
opening cross-section.
As a result of the flow inside the unit, air which is already pre-heated
enters the heat sinks which causes an excessively high component
temperature rise. In addition, a different, more unfavourable operating
point is set for the fan.
If the units are operated with an arcing short-circuit, this will result in the
failure of the units or in their destruction!
An arcing short-circuit must be prevented by the provision of
partitions.
The switch cabinets adjacent to the inverter cabinets must also be
taken into consideration in this case.
Partitions should be executed up to the cabinet frame and should be
designed in such a way that the discharged air flow is taken around the
cabinet beams and not pressed into them.
Partitions are necessary with all types of protection higher than IP20.
a
b
a
B
Front view
6SE7087-6CX86-2BA1
Operating Instructions SIMOVERT MASTERDRIVES AFE
04.2006
Cutouts for
M8 screw
Dimen-
Type
sions
E
F
G
[mm]
a
45
45
119
b
180
270
270
c
25
25
25
B
270
360
508
H
1050
1050
1450
h
1025
1025
1375
Siemens AG
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