Danfoss VACON NX Commissioning And Maintenance Manual page 35

COMMISSIONING
It is recommended to use a 2C safety margin. Therefore the primary circuit temperature should in
this case be set to 38C (36C +2C). Using a 38C temperature, instead of 40C, on the primary
circuit will reduce the required load reduction of the main drive. For more information regarding the
load reduction of the drives refer to the VACON
with the main drive.
Primary circuit minimum +38°C (36°C+2°C)
Figure 5.3-4 Example 2
The secondary circuit maximum temperature should always be 5C lower than the primary circuit
temperature to ensure a good thermal load transfer between the two circuits. In example 2 this
means that the secondary circuit should be between +5...+33C during operation. The 3-way valve in
the secondary circuit will then keep the primary circuit temperature at 38C regardless of the main
drive load.
Exampl e 2b, r educing the ambient r el ative humidity
remover be installed that can reduce the maximum RH to an acceptable level. In example 2, a
reduction of the maximum RH from 80% to 50% will allow the primary circuit temperature to be 30C
and therefore give the possibility to run the main drive at full load.
Ambient temperature = 40C
Maximum relative humidity = 80% 50%
Acc. to chart 3.3-1Dew point is @ 28C
When adding the safety margin of 2C the primary circuit temperature can be set to 30C. In this
case a reduction of the maximum RH from 80% to 50%, by using a humidity remover, will allow the
primary circuit temperature to be set to 30C therefore allowing the main drives to be run at full
load.
Local contacts: http:/ / dr ives.danfoss.com/ danfoss- dr ives/ local - contacts/
Maximum ambient temperature +40°C
Maximum ambient relative humidity 80%
VACON LIQUID COOLED NX DRIVE
®
HXL120
VACON 3 5
Secondary circuit
maximum +33°C
(38°C-5°C)
5