Condensation - Vacon NX User Manual

vacon • 60
5.2.1

Condensation

Condensation on the cooling plate of the VACON
Therefore, the temperature of the cooling liquid must be kept higher than the temperature of the
electrical room. Use the graph below to determine if the drive operating conditions (combination of
room temperature, humidity and cooling liquid temperature) are safe, or, to choose the allowed
temperature for the cooling liquid.
The conditions are safe when the point is below the respective curve. If not, take adequate
precautions by decreasing the room temperature and/or the relative humidity or increase the
cooling liquid temperature. Note that increasing the temperature of the cooling liquid above figures
in loadability charts decreases the nominal output current of the drive. The below curves are valid
at sea level altitude (1013 mbar).
60
50
40
30
20
10
0
100 90
Example:
If the temperature of the electric room is 30 °C, the relative humidity is 40% and the temperature of
the cooling liquid is 20 °C (the lowest curve in Figure 26), then the drive operating conditions are
safe.
However, if the room temperature were to rise to 35 °C and the relative humidity to 60%, then the
operating conditions of the drive would no longer be safe. In this case, to reach safe operating
conditions, the air temperature should be cooled to 28 °C or lower. If it is not possible to lower the
room temperature, then the temperature of the cooling liquid should be raised to at least 25 °C.
5
Condensation - Safe operating area
80 70 60
Electric room rela ve humidity %
Figure 26. Safe operating conditions in relation to condensation
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
®
NX Liquid-Cooled drive must be avoided.
50 40 30 20
Installation
Coolant
temp °C
45
40
38
35
30
25
20
10 0
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