Lenze 9400 Manual - Manual (Page 314)

DC-bus operation
Conditions for trouble-free DC-bus operation
Voltages
8

314 EDS94SPP101 EN 7.1
8.2 Conditions for trouble-free DC-bus operation
8.2.1 Voltages
Controllers can only be operated in a DC-bus connection, if the rated mains voltage/the
rated DC-bus voltage is the same. All brake choppers in the DC-bus system must have the
same thresholds.
8.2.2 Number of feeding points
The 9400 servo drives series has been designed for drive systems with a central AC mains
feeding point. For this you can use DC supply modules of different power categories.
Several AC mains feeding points are only permitted in drive systems with two single-axis
controllers of the same power category with inverse operation in motor and generator
mode. Your Lenze representative will be pleased to inform you about further possible
supply concepts.
8.2.3 Other conditions
ƒ The entire DC power P
DC
must be provided by the feeding point (DC-supply module
or ”Single Drive” controller).
ƒ The controllers in the DC bus may only start operation when the DC bus has been
completely loaded. I.e. controller enable may only be set after ”State bus OK” (see
terminal X2).
ƒ Up to a total current of 100 A, devices up to 24 A (device sizes 1 ... 3) can be operated
via the integrated DC busbar. Maximum busbar overload for 60 s: 150 % * I
r
,
followed by a relief phase of 120 s: 75 % * I
r
.
ƒ
The DC bus must at no time be overloaded through the required maximum total
power. For this, a time/performance diagram has to be created and considered (see
Basic dimensioning).
ƒ The cable protection measures described for the DC-bus operation must be
observed.