Siemens SIMOVERT MASTERDRIVES 6SE7087-6CX86-2BA1 Manual page 164

Technical Data
NOTE
17-8
Permissible rated output voltage in %
acc. to VDE 0110 / IEC 664-1
(not necessary acc. to UL / CSA)
100
75
50
0 1000 2000
Installation altitude above sea level in m
Permissible rated current in %
100
75
50
25
0
0 10 20 30
Cooling-medium temp. in °C
Permissible rated current in %
100
90
80
70
60
0 1000 2000
Installation altitude above sea level in m
Fig. 17-3 Derating curves
The derating of the permissible rated current for installation altitudes of
over 1000 m and at ambient temperatures below 40 °C is calculated as
follows:
Total derating = Derating
K = K x K
1 2
It must be borne in mind that total derating must not be greater than 1!
Example: Altitude: 3000 m
Ambient temperature: 35 °C
→ Total derating = 0.845 x 1.125 = 0.95
3000 4000
40 50
3000 4000
x Derating
altitude ambient temperature
6SE7087-6CX86-2BA1
Operating Instructions SIMOVERT MASTERDRIVES AFE
06.2005
Temp Derating
[°C] factor K
2
50 0.76
45 0.879
40 1.0
35 1.125 *
* See the
30 1.25 *
following
Note
1.375 *
25
Altitude Derating
[m] factor K
1
1000 1.0
2000 0.9
3000 0.845
4000 0.8
K = 0.845
1
K = 1.125
2
Siemens AG