Lenze E82xVxxxKxxxxx - Manual (Page 463)

DC−bus operation
Conditions for trouble−free DC−bus operation
DC−bus connection
12
l
463 EDS82EV903−3.0
Additional capacities on the DC bus
Additionally operated capacities on the DC bus may overload the input rectifier of the
controllers or the 934X power supply unit.
Hence, install corresponding charging resistors or symmetrical resistors for additional
capacities.
12.3.3 DC−bus connection
Ensure short cable connections to the common DC−bus star point.
Selection of cable cross−section
Select the cable cross−section for the DC bus according to the sum of mains supplies:
Example
A1
F4, F5
F1 ... F3
3 x 16A
3 x 50A 3 x 125A
AC
DC
M M M
A2 A3
Z
8200vec651
Fig. 12−2 Example: DC connection of three controllers
A1 ... An Controller 1 ... controller n
F1 ... F3 Mains fuses
F4 ... F5 Fuses on DC level
Z1 ... Zn Mains choke
Sum of the possible effective continuous currents of the parallel mains supplies:
16 A + 50 A + 125 A = 191 A
The cable cross−section results from the resulting current of 191 A and the local basic
conditions such as ambient temperature, conductor material, type of conductor, laying
system, volume expansion, standards and regulations.
Reduce conductor inductance
Reduced cable inductance through:
ƒ Shielded cables (lay unshielded cables between controller (+U
G
, −U
G
) and DC busbar
in parallel, twist if required)
ƒ DC busbar in the control cabinet