Calculation Examples - Siemens SIMODRIVE 611 digital Configuration Manual

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05.01 05.08 10.04
4.4.4
Temperature/
installation
altitude derating
Current reduction
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
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Calculation examples

S
Supplementary conditions
Power module:
Operating mode:
Inverter pulse frequency:
Installation altitude
Ambient temperature
S
Determining the derating factors
X = 100% –
T
X = 100% – 2.5%  (45 °C – 40 °C) = 87.5%
TU
X [ 85%
H
S
Calculating the permissible current values
I = I  X
Nred N
I = I
maxred max
Power module:
Operating mode:
Inverter pulse frequency:
Installation altitude
Ambient temperature
(100% – 55%)  (6.3 kHz – 4.0 kHz)
X = 100% –
T
å I = I  X
N6.3 N
å I = I
max 6.3 max
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6SN1123–1AA0
FD
6.3 kHz
2000 m above sea level
45 °C
= 55%
X
L
f = 4.0 kHz
0
I = 56 A
N
I = 112 A
max
(100% – 55%)  (6.3 kHz – 4.0 kHz)
8.0 kHz – 4.0 kHz
 X  X = 56 A  0.74125  0.875  0.85 = 30.8 A
T TU H
 X  X  X = 112 A  0.74125  0.875  0.85 = 61.7 A
T TU H
6SN1123–1AA0
FD
6.3 kHz
<1000 m above sea level
<40 °C
X = 55%
L
f = 4.0 kHz
0
I = 56 A
N
I = 112 A
max
8.0 kHz – 4.0 kHz
= 56 A  0.74125 = 41.5 A
T
 X = 112 A  0.74125 = 83.0 A
T
Industry Automation
4 Power Modules
4.4 Current reduction/derating
–0EA1
j
= 74.125 %
–0EA1
j
= 74.125 %
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