System Manual – MOVITRAC® 07
91
5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Overload capacity
Project Planning
5.6
Overload capacity
MOVITRAC
®
07 frequency inverters permanently calculate the load on the inverter out-
put stage (unit utilization). They can output the maximum possible power in any operat-
ing status. The permitted continuous output current depends on the ambient tempera-
ture, heat sink temperature, supply voltage and PWM frequency. The inverter reacts to
a higher than permitted load by outputting the
F-44 Unit utilization
fault message and
performing an immediate switch-off.
The following diagrams show the temperature/time characteristic of the units. The in-
verter automatically reduces its switching frequency if a certain switching frequency
reaches the corresponding limit characteristic curve.
04977BXX
Figure 44: Overload capacity at 40 °C
04978BXX
Figure 45: Overload capacity at 25 °C
Size
0S
0M
0L
1
2S
2
3
4
T (min)
10
23
3
3.5
4
5
4
9
