6
05.01
6.4 Technical data
6-170
©
Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
P
t
1
t
t
2
t
3
t
k
T
P
1
P
k
P
3
P
2
Fig. 6-11
Explanation of the rule of thumb for block–type load duty cycles
The following applies for the rules of thumb:
The evaluation factor B, calculated for the load duty cycle, must be less than
the maximum values B
max
specified in Table 6-11.
The maximum infeed power P
max
of the infeed module may not be ex-
ceeded.
The power derating as a function of the installation altitude must be taken
into account.
Table 6-11
Evaluation factor for the load duty cycle
Total duration
T
10 s
10 s
T
60 s
60 s
T
600 s
B
max
1.03
0.90
0.89
Calculation example for a block–type load duty cycle:
Evaluation/assessment factor B should be determined for the following load
duty cycle:
Infeed module used: I/R 36 kW (P
n
=36 kW; P
max
=70 kW)
i
1
2
3
4
5
P [kW]
50
20
36
0
40
t [s]
1.5
1
2
1.2
1.2
P
t
1
t
t
2
t
3
t
5
T
P
1
P
5
P
3
P
2
t
4
P
4
=0
Fig. 6-12
Example, calculating a load duty cycle
6 Infeed Modules
02.03
02.03