5vacon • 60 InstallationLocal contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/5.2.1 CondensationCondensation on the cooling plate of the VACON ® NX Liquid-Cooled drive must be avoided.Therefore, the temperature of the cooling liquid must be kept higher than the temperature of theelectrical room. Use the graph below to determine if the drive operating conditions (combination ofroom temperature, humidity and cooling liquid temperature) are safe, or, to choose the allowedtemperature for the cooling liquid.The conditions are safe when the point is below the respective curve. If not, take adequateprecautions by decreasing the room temperature and/or the relative humidity or increase thecooling liquid temperature. Note that increasing the temperature of the cooling liquid above figuresin loadability charts decreases the nominal output current of the drive. The below curves are validat sea level altitude (1013 mbar).Figure 26. Safe operating conditions in relation to condensationExample:If the temperature of the electric room is 30 °C, the relative humidity is 40% and the temperature ofthe cooling liquid is 20 °C (the lowest curve in Figure 26), then the drive operating conditions aresafe.However, if the room temperature were to rise to 35 °C and the relative humidity to 60%, then theoperating conditions of the drive would no longer be safe. In this case, to reach safe operatingconditions, the air temperature should be cooled to 28 °C or lower. If it is not possible to lower theroom temperature, then the temperature of the cooling liquid should be raised to at least 25 °C.01020304050600102030405060708090100Ambien temp °CElectric room relave humidity %Condensation - Safe operating area45403835302520Coolanttemp °C11334_uk
