5.4 Derating for Ambient Temperature
The average temperature (T
AMB, AVG
) measured over 24
hours must be at least 5 °C lower than the maximum
permitted ambient temperature (T
AMB,MAX
). If the frequency
converter operates at high ambient temperatures, then
decrease the continuous output current. Derating depends
on the switching pattern, which can be set to 60
°
AVM or
SFAVM in
parameter 14-00 Switching Pattern
.
5.4.1 Derating for Ambient Temperature,
Enclosure Size A
60
°
AVM – pulse width modulation
2
20%
4
6
8
10
12
14
16
40%
60%
80%
100%
110%
Iout (%)
fsw (kHz)
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
130BA393.10
0
0
Illustration 5.2 Derating of I
out
for Different T
AMB, MAX
for
Enclosure Size A, using 60
°
AVM
SFAVM – stator frequency asynchron vector modulation
2
20%
4
6
8
10
12
14
16
40%
60%
80%
100%
110%
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
0
0
130BD639.10
I
out
(%)
fsw (kHz)
Illustration 5.3 Derating of I
out
for Different T
AMB, MAX
for
Enclosures Size A, using SFAVM
When using only 10 m motor cable or less in enclosure
size A, less derating is necessary. This is because the length
of the motor cable has a relatively high impact on the
recommended derating.
60
°
AVM
2
20%
4
6
8
10
12
14
16
40%
60%
80%
100%
110%
I
out
(%)
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
0
0
130BA394.10
fsw (kHz)
Illustration 5.4 Derating of I
out
for Different T
AMB, MAX
for
Enclosures Size A, using 60
°
AVM and Maximum 10 m Motor
Cable
SFAVM
2
20%
4
6
8
10
12
14
16
40%
60%
80%
100%
110%
I
out
(%)
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
0
0
130BD640.10
fsw (kHz)
Illustration 5.5 Derating of I
out
for Different T
AMB, MAX
for
Enclosures Type A, using SFAVM and Maximum 10 m Motor
Cable
5.4.2 Derating for Ambient Temperature,
Enclosure Size B
Enclosure B, T2, and T4
60
°
AVM – pulse width modulation
2
20%
4
6
8
10
12
14
16
40%
60%
80%
100%
110%
f
sw
(kHz)
0
0
I
out
(%)
NO
45°C
50°C
55°C
130BA401.11
B1
B2
Illustration 5.6 Derating of I
out
for different T
AMB, MAX
for
Enclosure Sizes B1 and B2, using 60
°
AVM in Normal Overload
Mode (110% Overtorque)
Special Conditions
VLT
®
Refrigeration Drive FC 103
100
Danfoss A/S © 08/2015 All rights reserved.
MG16G202
5
5
Содержание VLT FC 103
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