Coolant Temperature And Moisture Condensation; Table 29: Dew Point Table - KEB COMBIVERT F6 Instructions For Use Manual

cOOLANT TeMPerATUre AND MOISTUre cONDeNSATION

5.5 coolant temperature and moisture condensation
The inlet temperature may not exceed 40°C. The maximum heat sink tem-
perature is 90°C or 95°C depending on the power unit and overload capacity
=>
put temperature must be 10K below this temperature.
A temperature difference between drive converter and ambient temperature can lead to
condensation at high humidity.
Moisture condensation is dangerous for the drive converter. The drive converter can be
destroyed through occuring short-circuits.
In order to avoid moisture condensation, there are the following possibilities.
Supply of temper coolant
This is possible by using heatings in the cooling circuit for the control of the coolant tem-
perature. The following dew point table is available for this:
The following table shows the coolant inlet temperature as a function of ambient tem-
perature and air humidity.
Air humidity / %
Surrounding
Temperature / °c
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
Table 29: Dew point table
„Switching frequency and
The user must guarantee that any moisture condensation is avoided!
10 20
-45 -40
-42 -36
-37 -31
-34 -26
-29 -22
-26 -19
-23 -15
-19 -11
-18 -7
-12 -4
-8 0
-6 3
-2 8
1 11
4 15
8 19
temperature". To ensure a safe operation the coolant out-
30 40 50 60
-36 -34 -32 -30
-32 -29 -27 -25
-27 -24 -22 -20
-22 -19 -17 -15
-18 -15 -13 -11
-14 -11 -8 -6
-11 -7 -5 -2
-7 -3 0 1
-3 1 4 7
1 5 9 12
5 10 13 16
10 14 18 21
14 18 22 25
18 22 27 31
22 27 32 36
28 32 36 40
coolant inlet temperature / c°
70 80 90 100
-29 -27 -26 -25
-24 -22 -21 -20
-18 -16 -15 -15
-13 -11 -11 -10
-8 -7 -6 -5
-4 -3 -2 0
0 2 3 5
4 6 8 9
9 11 13 15
14 16 18 20
19 21 23 25
24 26 28 30
28 31 33 35
33 36 38 40
38 41 43 45
43 45 48 50
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