Operating the Drive
Page 7-32 890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
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E
A Single Motor System
890 Drive
(4-Q Power Supply)
DC+
DC
-
U
V
W
720V
Boosted Common
DC Link Supply
External Pre-
Charge
Control
DC
AC Motor
Motor Load
DC
-
DC+
U
V
W
890 Drive
Link Fuses
4-Q Active Front End
The simplest configuration for 4-Q Regen control is a single 890 Regen drive acting as the unity power
factor supply, connected via the DC link to another 890 driving the application.
Applications of single motor 4-Q Regen systems include :
• Hoist and Elevators
• Dynamometer test rigs
• Unwind Stands
• Installations that would otherwise require a Harmonic Power Filter
In this system, the two 890 drives are matched in power. The 4-Q Regen drive supplies the full motoring
and regenerating requirement of the load.
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