D3-DU 3xx/A, /BMounting and installation instructions
Project engineering manual V1.09
48
© KEBA 2021
5.4.1 For wall mounting
For mounting the devices proceed as follows:
1) Allign the module on the mounting plate having regard to the specified
space requirement. Align all the devices in a line along the top edge of
the device. This is necessary to complete the d.c. link connection with
rails.
2) Mark out the position of the threaded holes on the mounting plate. Drill
holes in the mounting plate and cut a thread for each fixing screw in the
mounting plate. (The bend radius of the connecting cables must be
taken into account.)
3) Mount the modules vertically abutting on the mounting plate. Make sure
the surface of the cooler is free of drill chippings or other soiling.
The DU 3xx/x is now mounted and ready for cabling (see chap. "Connec-
tions and wiring").
5.4.2 For cooling element
For mounting proceed as follows:
1) Mount a cooling element with screws perpendicular to the backside of
the cooling plate for each device.
2) Mount the cooling plate in the control cabinet. Therefore an opening at
the backside of the control cabinet has to be provided.
3) Align the devices perpendicular to the cooling plate in height of the cool-
ing element. Align all the devices along the top edge of the device.
4) Mount the devices successively on the cooling plate. Tighten the screws
evenly so that the thermal resistance remains as low as possible. The
contact area must be metallic, bare and conductive.
Caution
Please ensure that there are no particles of dirt between the cooler and the
rear wall of the device during mounting. If this instruction is not followed, the
device will overheat due to the poor thermal transfer. The device may fail as
a result.
The DU 3xx/x is now mounted and ready for cabling (see chap. "Connec-
tions and wiring").
Sizing the cooler
DU 3xx/x size BG1 DU 3xx/x size BG2
Thermal resistance R
th
K
1)
0.02 K/W 0.01 K/W
Thermal capacity of the cool-
ing plate on the device
390 Ws/K 780 Ws/K
Max. temperature cooling
plate Device
85 °C
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