Lenze 8200 Frequency inverters - Manual (Page 247)

Network of several drives
8200SHB0199 10-4
10.2.3 DC-bus connection
-
Use short cable connections to the shared DC-bus star point.
-
Cross-section of the DC-bus connection cable
á
U
G
↔ DC-bus
- must be selected according to the fuses F1 ... F3 of the corresponding
controller and the local conditions.
-
Cable cross-section of the DC-bus
- must be selected according to the sum of the mains supplies in the
DC-bus (see chapter 10.2.4).
-
Example:
Controller 1 Controler 2 Controller 3
F4, F5
3 AC / PE / xxx V / xx Hz
F1 ... F3
3 x 16A 3 x 50A 3 x 125A
Mains
DC bus
M M M
FIG 10-1 Example for the rating of the cable cross-section of the DC-bus
- Sum of the possible permanent r.m.s. currents of the parallel mains
supplies: 16 A + 50 A + 125 A = 191 A
- The cable cross-section is selected according to the resulting current of
191 A and the local conditions, as for instance, ambient temperature,
conductor material, conductor type, type of laying, expansion, standards,
and regulations.
-
Ensure smallest possible line inductivity by selecting the corresponding type
of installation:
- DC-bus star point in control cabinet above parallel busbar.
- Cables between controller (connections +U
G
and -U
G
) and DC-bus start
point must be in parallel or twisted.
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