Trip Amplifier 2/208
Mounting
27
9938
20
15-06
15
EN
3
Mounting
3.1
Place for mounting
19" plug-in unit, E-card, 4 uw. racks or housings as card holders with guide rails and
plug connectors to accept the plug-in units, see D807.
Assemble:
1. Racks could be placed in protective enclosures, at walls, in switching panels or in
cabinets. In any way mounting is to be done such that the front panels of the plug-
in units are arranged vertically when pushed into the rack.
2. The place should be dry and free of dust. Avoid strong vibrations, mechanical
treatment and heat. Watch the approved ambient conditions.
3. The plug-in units have to be fixed in racks by screws or by quick catches.
3.2
Remarks for switching cabinets and heat dissipation
Electronical appliances convert a part of the applied power supply to heat. The
overtemperature resulted must not influence the function of the appliances. Because
of this, watch the approved ambient conditions (see data sheet) when planning the
assembly of the switching cabinet. The table below shows an approved
overtemperature of 25 K.
According to data sheet, the appliances stand a maximum ambient temperature of
60 °C. You can use the heat dissipation values shows in the table below to calculate
the maximum number of appliances per switching cabinet in that case, that you lay
down 60 °C as average temperature of the appliances and the ambient temperature in
the switching cabinet never rise up more than 40 °C. When meeting those
requirements the overtemperature is (60 - 40) K = 20 K.
1. Draught ventilation through self convection: 400 W
2. Draught ventilation with separate ventilator with filter: 800 W
3. Draught ventilation with separate ventilator without filter: 1600 W
4. Self convection without separate ventilation: 160 W
5. Circulation with ventilator on rack floor: 320 W
6. Circulation with heat converter, separate ventilation inside and outside 1500 W
Heat dissipation:
1. If the 19" racks are assembled in open frames, the natural self convection is
sufficient. Make sure, that on the upper rack is nothing or if there is a sheet metal,
that it has enough ventilation slots to avoid heat dissipation.
2. Avoid continuous operating overvoltages.
3. If there are especially bad ambient conditions, control the ambient temperature
near by the appliances (about 1 cm distance of the front panels). In at least badest
operating conditions the ambient temperature should not rise up more than 60 °C.
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