Drive (CDM) Design T1689 Technical Manual Rev 07
Component Selection – Cooling System Design MV3000 Air Cooled DELTA
Page 90
3.7 COMPONENT SELECTION – COOLING SYSTEM DESIGN
3.7.1 Introduction To Cooling System
3.7.1.1 DELTA Power Modules:
• Have the power losses removed by the fan located above the module.
• Requires some forced air flow to provide ventilation for components that are not in the main air
path of the primary cooling fan.
3.7.1.2 DELTA Control Components
• Air cooled, with low power losses.
3.7.1.3 DELTA Wound Components
• Cooling depends on the individual component (see specification chapter).
• Some components e.g. sharing reactors are usually air-cooled.
• Wound components usually have high temperature rating (class H is up to 180°C).
3.7.2 Primary Air Cooling
The main cooling process for the DELTA modules is the MVC3014-4001 High Performance fan that is located
above each of the DELTA modules. The cooling air is drawn in at the base of the DELTA modules, is drawn over
the heatsink(s) within the module, through a fan chamber above the DELTA modules and out through the fan
housing.
Air into the DELTA module can be drawn in directly into the unit or (preferably) routed via ducting from outside
of the enclosure.
The direction of the air out of the fan housing is defined by blanking off the appropriate opening with the
blanking plates provided. The air out can be forwards, upwards or rearwards. Ducting should then be used to
route this out of the enclosure.
To avoid impairing cooling performance the airflow must not be impeded and extra fan assistance should be
installed where significant impedance is introduced by filters or restrictive ducting.
The primary cooling system can use 'dirty' air providing it does not contain corrosive, conductive, or explosive
dusts or gasses, See Table 2–3. – Temperature & Humidity. It can be easily separated from the control cubicle
internal air by ducting the intake and output to the outside of the cubicle. As the cooling fans draw air through
the power device cooling path a negative pressure is developed, so a small amount of clean air from the cubicle
will constantly bleed into the dirty air duct and not vice versa. The air outlet must be carefully sealed as it is at a
higher pressure than the internal cubicle ‘clean’ air.
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