Table of Contents
Advertisement
be derated by 6 percentage points per 1 °C (1.8 °F) temperature increase, as
shown by curve (c).
•
If there are no components with a maximum operating temperature of 55 °C
(131 °F) installed in the same space as the drive modules, drive output current
must be derated by 2 percentage points per 1 °C (1.8 °F) temperature increase,
as shown by curve (b).
The drawing below shows the derating factor (k) in relation to coolant temperature.
k
1.00
(a)
0.90
0.80
0.70
0.60
+40 °C
+45 °C
+104 °F
+113 °F
Condensation is not permitted. The minimum coolant temperature to avoid
condensation (at an atmospheric pressure of 1 bar) is shown below as a function of
relative humidity (RH) and ambient temperature ( T
T
air
(°C)
RH = 95%
5
10
15
20
25
30
35
40
45
50
55
= Not permitted as standard but the coolant temperature must be 0 °C (32 °F) or more.
At an air temperature of 45 °C and relative humidity of 65% the coolant temperature
Example:
Maximum temperature rise: Depends on heat losses and mass flow. Typically 10 °C
(18 °F) with nominal losses and flow.
(b)
(c)
+50 °C
T
+122 °F
RH = 80%
4.3
1.9
9.2
6.7
14.2
11.5
19.2
16.5
24.1
21.4
29.1
26.2
34.1
31.1
39.0
35.9
44.0
40.8
49.0
45.6
53.9
50.4
must not be less than +36.8 °C
Internal cooling circuit 157
).
air
Min. T
(°C)
coolant
RH = 65%
RH = 50%
-0.9
3.7
8.4
13.2
17.9
22.7
27.4
32.2
36.8
41.6
46.3
RH = 40%
-4.5
-7.4
-0.1
-3.0
4.6
1.5
9.4
6.0
13.8
10.5
18.4
15.0
23.0
19.4
27.6
23.8
32.1
28.2
36.7
32.8
42.2
37.1
Advertisement
Table of Contents
