Special Conditions; Purpose Of Derating; Derating For Ambient Temperature - Danfoss VLT Micro Drive FC 51 Design Manual

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4.2 Special Conditions

4.2.1 Purpose of Derating

Consider the purpose of derating 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 4

4.2.2 Derating for Ambient Temperature

Derating for ambient temperature and IGBT switching.
The ambient temperature measured over 24 hours should
be at least 5 °C lower than the maximum ambient
temperature. If the frequency converter is operated at high
ambient temperature, decrease the constant output
current. The frequency converter has been designed for
operation at maximum 50 °C ambient temperature with 1
motor size smaller than nominal. Continuous operation at
full load at 50 °C ambient temperature reduces the lifetime
of the frequency converter.
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
0
0 2
Illustration 4.32 M1 200 V
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
0
0 2
Illustration 4.33 M1 400 V
36
VLT
M1 200 V
4 6 8 10 12 14
M1 400 V
50 ℃
4 6 8 10 12 14
Danfoss A/S © 01/2016 All rights reserved.
®
Micro Drive FC 51
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
0
0
Illustration 4.34 M2 200 V
Iout [%]
110 %
100 %
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
0
0
Illustration 4.35 M2 400 V
40 ℃
Iout [%]
45 ℃
110 %
50 ℃
100 %
16 fsw [kHz]
90 %
80 %
70 %
60 %
50 %
40 %
30 %
20 %
10 %
0
0
Illustration 4.36 M3 200 V
40 ℃
45 ℃
16 fsw [kHz]
M2 200 V
2 4 6 8 10 12
M2 400 V
2 4 6 8 10 12
M3 200 V
50 ℃
2 4 6 8 10 12
40 ℃
45 ℃
50 ℃
14 16 fsw [kHz]
40 ℃
45 ℃
50 ℃
14 16 fsw [kHz]
40 ℃
45 ℃
14 16 fsw [kHz]
MG02K402