Lenze i750 - Dimensioning

Dimensioning
The free EASY Engineering Tool "Drive Soluon Designer" (DSD) help
s you to
dimension your DC-bus.
Download of »Drive Soluon Designer«
Precondions
To calculate the total power of the DC bus manually, you need a me/power diagram of all
inverters for a complete machine cycle. The power balance of the DC bus can be determined
from the addion of the simultaneous individual power outputs:
•
P
osive values correspond to the supply power from the AC system, which determines the
selecon of the supplier.
•
Negave values correspond to the braking power that must be dissipated via a brake
resistor or a regenerave power supply module.
t
t
t
t
t
0
0
0
0
0
P
4
P
3
P
2
P
1
P
res
P
av
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
Fig. 10: Example me/po
wer diagram
P1 ...
P4
Individual power outputs of
inverters 1 ... Inverter 4
Pres Sum of the individual power outputs
Pav Mean value of the individual power
outputs
Informaon on pr
oject planning
DC-bus connecon
Dimensioning
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