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6.4
Protection of heat sink against condensation
High atmospheric moisture at high exterior temperatures combined with a low coolant temperature can
result in condensation in the heat sink and the frequency inverter electronic system.
CAUTION
Condensation
Condensation can result in short-circuits in the frequency inverter and destruction of the
frequency inverter, refer to Operating Instructions of device.
Ensure that condensation is avoided by taking the precautions described below.
6.4.1 Supply of temperature-controlled coolant
The table shows the minimum coolant inlet temperature as a function of the ambient temperature and
relative humidity. The hatched areas at the bottom right represent the non-permissible range.
0
5
10
15
20
25
30
35
40
45
50
55
If relative humidity cannot be measured, the inlet temperature must at least be the same as the ambient
temperature. The coolant inlet temperature must not exceed 45°C.
11/17
Relative humidity in %
10
20
30
40
50
-28
-20
-16
-12
-9
-24
-16
-11
-7
-5
-20
-12
-7
-3
-16
-8
-2
2
-13
-4
2
6
-9
0
6
10
14
-5
5
11
15
18
-1
9
15
19
23
3
13
19
24
28
6
17
23
28
32
10
21
28
33
37
14
25
32
37
41
Liquid Cooling ACU/ANG/AEC
60
70
80
90
-7
-5
-3
-1
-2
0
2
3
0
3
5
7
8
5
7
10
12
13
9
12
14
16
18
17
19
21
23
21
24
26
28
26
29
31
33
31
33
36
38
35
38
41
43
40
43
45
95 100
-1
0
4
5
9
10
14
15
19
20
24
25
29
30
34
35
39
40
44
45
27
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