Permissible Duty Cycles/Derating - Siemens SIMODRIVE 611 digital Configuration Manual

6 Infeed Modules
6.3 Technical data
6.3.2

Permissible duty cycles/derating

Nominal load duty
cycles for NE
modules
P
P
max
P
s6
P
n
4 min
0.4 P
n
10 min
S6 load cycle with pre–load condition
P
P
max
P
n
0.2 s
10 s
Peak power load duty cycle with pre–load
Fig. 6-7 Nominal load duty cycles for NE modules
Calculation of
maximum
permissible line
infeed load
6-162
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P
max
P
s6
P
n
0.4 P
t
F  P
n
P
n
t
F: For all NE modules up to Pn v 80 kW, F = 1.6 applies
The effective load must be determined over a load period/cycle and this must
be set to the ratio for the rated power of the module. The resulting weighting
factor B must not exceed the factors of the associated time interval T indicated
in Table 6-7. Note that the maximum P
and the derating factor, depending on the pulse frequency and/or installation
altitude, must be taken into account!
As a rule of thumb, the following applies for block-type load duty cycles:
2 t + 2
P  P 
1
1 2
B =
T  P
T Total duration of the load duty cycle
P Rated power of the I/R module
n
P ...P Magnitude of the required power
1 k
t ...t Duration of the corresponding power
1 k
B Evaluation factor for the load duty cycle according to Table 6-7
P
P
1
P
k
P
3
P
2
t t
1
Fig. 6-8 Explanation of the rule of thumb for block–type load duty cycles
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
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P
10 s
n
60 s
Peak power load duty cycle with pre–load
P
4 s
10 s
Peak power load duty cycle without pre–load
For Pn = 120 kW, F = 1.4 applies (F = factor)
must not be exceeded at any time
max
t +...+ 2 t
P 
2 k
k
2
n
t
2 3
T
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