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C.8
Derating
C.8.1
Current derating
The devices and the associated system components are rated for an ambient temperature of
40 °C and installation altitudes of up to 1000 m above sea level.
The following tables specify the permissible output currents as a function of the installation
altitude and ambient temperature.
Note also the information in Chapter "Voltage derating (Page 143)".
Table C- 3
Current derating for air-cooled converters
Installation alti-
Current derating factor in % of rated current
tude above sea
level in m
0 ... 1000
100 %
1001 ... 1500
100 %
1501 ... 2000
100 %
2001 ... 2500
100 %
1)
2501 ... 3000
95.3 %
1)
3001 ... 3500
89.8 %
1)
3501 ... 4000
84.4 %
1)
4001 ... 4500
78.9 %
1)
4501 ... 5000
73.5 %
1)
Voltage derating is also required for installation altitudes > 2000 m.
1)
C.8.2
Voltage derating
The devices are dimensioned according to minimum clearances of up to 2000 m above sea
level. Voltage derating is required above 2000 m above sea level.
Since the air clearances in the converter cannot be changed, this factor must be taken into
account in the voltage derating calculation.
Table C- 4
Voltage derating
Installation altitude above sea level in m Voltage derating factor in % of rated voltage
0 ... 2000
2001 ... 2500
2501 ... 3000
3001 ... 3500
3501 ... 4000
4001 ... 4500
4501 ... 5000
Installation and Operating Instructions for LOHER DYNAVERT I Series 7
Operating Instructions, 10/2022, 4BS0745-002
20 °C
25 °C
100 %
100 %
100 %
97.7 %
91.2 %
86.0 %
80.8 %
75.6 %
70.4 %
100 %
93.4 %
87.7 %
81.9 %
77.5 %
71.9 %
67.6 %
30 °C
35 °C
100 %
100 %
100 %
100 %
99.4 %
94.3 %
93.2 %
88.4 %
87.0 %
82.5 %
82.0 %
77.8 %
77.0 %
73.1 %
72.1 %
68.4 %
67.1 %
63.6 %
Technical data
40 °C
45 °C
100 %
87.5 %
94.4 %
82.6 %
88.9 %
77.8 %
83.3 %
72.9 %
77.8 %
68.1 %
73.3 %
64.2 %
68.9 %
60.3 %
64.4 %
56.4 %
60.0 %
52.5 %
C.8 Derating
50 °C
75.0 %
70.8 %
66.7 %
62.5 %
58.3 %
55.0 %
51.7 %
48.3 %
45.0 %
143
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