Parker ac890 - Page 233

8-34
Operating the Drive
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
8
9
10
11
A
B
C
D
1
2
3
4
5
6
E
A Multi-Motor System
890 Drive
(4-Q Power Supply)
DC+
DC
-
U
V
W
External Pre-
Charge
Control
AC Motor
U
V
W
4-Q Active Front End
720V
Boosted Common
DC Link Supply
Motor Acting as Load
(Motoring)
Motor Acting as Brake
(Regenerating)
DC-
DC+
DC Link Fuses
890
Drive
AC Motor
U
V
W
DC- DC+
890
Drive
In many applications, the total power consumed by the system is less than the installed power of the drives.
This is because some drives are motoring (eg. winders) and some are regenerating (eg. unwinders). In these
situations it is convenient to connect the drives on a common DC link.