4
05.01
4.4 Current reduction/derating
4-93
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
4.4.4 Calculation examples
S Supplementary conditions
Power module: 6SN1123–1AA0
j–0EA1
Operating mode: FD
Inverter pulse frequency: 6.3 kHz
Installation altitude 2000 m above sea level
Ambient temperature 45 °C
X
L
= 55%
f
0
= 4.0 kHz
I
N
= 56 A
I
max
= 112 A
S Determining the derating factors
(100% – 55%) (6.3 kHz – 4.0 kHz)
X
T
= 100% –
8.0 kHz – 4.0 kHz
= 74.125 %
X
TU
= 100% – 2.5% (45 °C – 40 °C) = 87.5%
X
H
[ 85%
S Calculating the permissible current values
I
Nred
= I
N
X
T
X
TU
X
H
= 56 A 0.74125 0.875 0.85 = 30.8 A
I
maxred
= I
max
X
T
X
TU
X
H
= 112 A 0.74125 0.875 0.85 = 61.7 A
Power module: 6SN1123–1AA0
j–0EA1
Operating mode: FD
Inverter pulse frequency: 6.3 kHz
Installation altitude <1000 m above sea level
Ambient temperature <40 °C
X
L
= 55%
f
0
= 4.0 kHz
I
N
= 56 A
I
max
= 112 A
X
T
= 100% –
(100% – 55%) (6.3 kHz – 4.0 kHz)
8.0 kHz – 4.0 kHz
å I
N6.3
= I
N
X
T
= 56 A 0.74125 = 41.5 A
å I
max
6.3
= I
max
X
T
= 112 A 0.74125 = 83.0 A
= 74.125 %
Temperature/
installation
altitude derating
Current reduction
4 Power Modules10.0405.08
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