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VLT Micro Drive Selection
4.2 Special Condition
4.2.1 Purpose of Derating
Purpose of Derating must be taken into account when using the frequency converter at low air pressure (heights), at low
speeds, with long motor cables, cables with a large cross section or at high ambient temperature. The required action is
described in this section.
4.2.2 Derating for Ambient Temperature
4
4
Derating for Ambient Temperature and IGBT Switching.
The ambient temperature measured over 24 hours should be at least 5° C lower than the max. ambient temperature. If the
frequency converter is operated at high ambient temperature, the continuous output current should be decreased. The
frequency converter has been designed for operation at max. 50° C ambient temperature with one motor size smaller than
nominal. Continuous operation at full load at 50° C ambient temperature will reduce the lifetime of the frequency converter.
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
0
0
2
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
0
0
2
38
VLT Micro Drive Design Guide
M1 200 V
4
6
8
10
12
14
M1 400 V
50 ℃
4
6
8
10
12
14
MG02K102 - VLT
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
40 ℃
30 %
45 ℃
20 %
10 %
50 ℃
0
16
fsw [kHz]
0
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
40 ℃
20 %
45 ℃
10 %
0
16
fsw [kHz]
0
®
is a registered Danfoss trademark
M2 200 V
2
4
6
8
10
12
M2 400 V
2
4
6
8
10
12
40 ℃
45 ℃
50 ℃
14
16
fsw [kHz]
40 ℃
45 ℃
50 ℃
14
16
fsw [kHz]
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