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6.12.2 Derating for Ambient Temperature
The ambient temperature (T
AMB,MAX
) is the maximum temperature allowed. The average (T
AMB,AVG
) is measured over 24 hours
and must be at least 5
°
C (41
°
F) lower.
At 41.7
°
C (107
°
F) , 100% of the rated output current is available. At 45
°
C (113
°
C ) (T
AMB
, MAX-3.3 K), 91% of the rated
output current is available.
NOTICE
FACTORY DERATING
The VLT
®
Parallel Drive Modules is already derated for operational temperature (55
°
C (131
°
F) T
AMB,MAX
and 50
°
C
(122
°
F) T
AMB,AVG
).
6.12.3 Derating for Switching Frequency
Graphs are presented individually for 60
°
AVM and SFAVM. 60
°
AVM only switches 2/3 of the time, whereas SFAVM switches
throughout the whole period. The maximum switching frequency is 16 kHz for 60
°
AVM and 10 kHz for SFAVM.
Voltage
range
Switching
pattern
High overload HO, 150%
Normal overload NO, 110%
380–500 V
60 AVM
130BX473.10
Iout [%]
fsw [kHz]
o
70
80
90
1
60
100
110
2
3
4
5
6
7
8
9
50 C
o
55 C
0
130BX474.10
70
80
90
1
60
100
110
2
3
4
5
6
7
8
9
0
50
o
50 C
o
55 C
o
45 C
Iout [%]
fsw [kHz]
SFAVM
130BX475.10
Iout [%]
fsw [kHz]
o
70
80
90
60
100
110
2
4
6
50
C
o
55
C
0
o
45
C
3
1
5
130BX476.10
Iout [%]
fsw [kHz]
o
70
80
90
60
100
110
2
4
6
50 C
o
55 C
0
o
45 C
50
o
40 C
1
3
5
Table 6.16 Derating for Switching Frequency, 250 kW at 400 V AC (350 hp at 460 V AC)
Specifications
Design Guide
MG37N102
Danfoss A/S © 6/2016 All rights reserved.
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6
6
Summary of Contents for VLT 380-500 V
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