Current Reduction/Derating; Pulse Frequency Power Modules - Siemens 6SN1123-1AA00-0DA2 Configuration Manual

5 Power Modules

5.4 Current reduction/derating

5.4 Current reduction/derating
5.4.1

Pulse frequency power modules

Definitions
Calculation
example
5-128
The current has to be reduced if one or more of the following limitations/secon-
dary conditions apply:
S
Selected inverter pulse frequency f
S
Installation altitude>1000 m above sea level
S
Ambient temperature T
Notice
The currents must be reduced for I
All of the relevant limitations/secondary conditions must be taken into account
with an appropriate reduction factor (refer to the calculation example, Chapter
5.4.4).
The current should be reduced from the reference frequency f
cording to the following rule:
(100% – X
X = 100% –
T
8 kHz – f
The pulse frequency of the power modules (inverters) must be at least factor 5
for the maximum motor frequency!
S
f Pulse frequency reference frequency in accordance with the
0
technical data
S
f set inverter pulse frequency
S
T ambient temperature
U
S
X power module-specific derating factor for the
L
inverter pulse frequency
S
X derating factor for the inverter pulse frequency
T
S
X derating factor for the ambient temperature
H
S
X derating factor for the installation altitude as a %
TU
See Chapter 5.4.4
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
> reference frequency f
T
> 40 °C
U
, I and I
n s6 max
)  (f – f
)
L 0
0
© Siemens AG 2012 All Rights Reserved
05.08 10.04
05.01
0
in the same way.
onwards ac-
0