Derating For Ambient Temperature - Danfoss VLT Refrigeration Drive FC 103 Design Manual

Special Conditions

5.4 Derating for Ambient Temperature

The average temperature (T
hours must be at least 5 °C lower than the maximum
permitted ambient temperature (T
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
5 5
60° AVM – pulse width modulation
I out (%)
110%
100%
80%
60%
40%
20%
0
0 2
Illustration 5.2 Derating of I
Enclosure Size A, using 60° AVM
SFAVM – stator frequency asynchron vector modulation
I (%)
out
110%
100%
80%
60%
40%
20%
0
0 2
Illustration 5.3 Derating of I
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.
100
) measured over 24
AMB, AVG
). If the frequency
AMB,MAX
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
f sw (kHz)
4 6 8 10 12 14 16
for Different T
out AMB, MAX
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
f sw (kHz)
4 6 8 10 12 14 16
for Different T
out AMB, MAX
Danfoss A/S © 08/2015 All rights reserved.
®
VLT Refrigeration Drive FC 103
60° AVM
I
out
110%
100%
80%
60%
40%
20%
0
0
Illustration 5.4 Derating of I
Enclosures Size A, using 60° AVM and Maximum 10 m Motor
Cable
SFAVM
I
out
110%
100%
80%
60%
40%
20%
for
0
0
Illustration 5.5 Derating of I
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
I
NO
110%
for
100%
80%
60%
40%
20%
0
0
Illustration 5.6 Derating of I
Enclosure Sizes B1 and B2, using 60° AVM in Normal Overload
Mode (110% Overtorque)
(%)
2 4 6 8 10 12 14
for Different T
out
(%)
2 4 6 8 10 12 14
for Different T
out
(%)
out
2 4 6 8 10 12
for different T
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
f sw (kHz)
16
for
AMB, MAX
A1-A3 45°C, A4-A5 40°C
A1-A3 50°C, A4-A5 45°C
A1-A3 55°C, A4-A5 50°C
f sw (kHz)
16
for
AMB, MAX
B1
B2
45°C
50°C
55°C
f (kHz)
sw
14 16
for
AMB, MAX
MG16G202