6
05.01
6.4 Technical data
6-169
©
Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
6.4.2
Permissible duty cycles/derating
For a derating, it must be analyzed as to the reason why this is required, and
which component is involved. For instance, if derating is required as a result of
the line voltage, then for uncontrolled infeed modules, the maximum motor
speed must be correspondingly adapted.
t
P
P
max
P
n
P
s6
0.4 P
n
4 min
10 min
t
P
P
max
P
n
P
s6
0.4 P
n
10 s
60 s
t
P
P
max
P
n
0.2 s
10 s
t
P
P
n
4 s
10 s
F
P
n
F: For all NE modules up to Pn
v
80 kW, F = 1.6 applies
For Pn = 120 kW, F = 1.4 applies (F = factor)
Peak power load duty cycle without pre–load
Peak power load duty cycle with pre–load
Peak power load duty cycle with pre–load
S6 load cycle with pre–load condition
Fig. 6-10
Nominal load duty cycles for NE modules
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 6-11. Note that the maximum P
max
must not be exceeded at any time
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:
B =
P
1
2
t
1
+
P
2
2
t
2
+...+
P
k
2
t
k
T
Total duration of the load duty cycle
P
n
Rated power of the I/R module
P
1
...P
k
Magnitude of the required power
t
1
...t
k
Duration of the corresponding power
B
Evaluation factor for the load duty cycle according to Table 6-11
T
P
n
2
Nominal load duty
cycles for NE
modules
Calculation of
maximum
permissible line
infeed load
6 Infeed Modules
02.07
02.12
