DC−bus operation
Conditions for trouble−free DC−bus operation
Voltages
7
338
EDS94SPP101 EN 10.2
7.2 Conditions for trouble−free DC−bus operation
7.2.1 Voltages
The DC−bus operation of controllers is only possible if the rated values of the mains voltage
or DC−bus voltage are identical. The switching thresholds of all brake choppers in the
interconnected system have to be set identically and the control has to be synchronised by
master/slave interconnection.
7.2.2 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 permissible in the interconnected system of two
single−axis drive controllers with the same power rating.
7.2.3 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.
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