Operating the Drive
890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
890CD/SD 4-Q Regen AFE Applications
Introduction
A 4-Q REGEN (4 Quadrant Regenerative) control mode is available on all 890CD Common Bus Drives
and 890 Standalone Drives, provided that:
♦ the drive uses Software Version 1.x (1.8 or greater), or Software Version 3.x
(Software Version 2.x does not support 4Q mode)
AND
♦ for Frame B-D: the SETUP::MISCELLANEOUS::EMC CAPACITORS parameter is set to (1)
NOT CONNECTED
♦ for Frame E-K: the drive displays “07” in Block 3 of the (Europe) Product Code indicating that
Special Option 7 is applied (“Y” cap disconnection)
IMPORTANT All drives in a common DC link scheme using a 4-Q Regen front-end MUST have their internal EMC
filter "Y" caps to earth (PE) removed.
The 4-Q REGEN control mode allows a single 890 to act as a 4-Q power supply unit that is capable of
drawing (motoring) and supplying (regenerating) sinusoidal, near-unity power factor current from the
supply.
The output from the 4-Q Regen drive acts as a DC supply which is used to power other drives on a common
DC Bus system.
A maximum of 90% of the constant torque current rating is available from the drive while in 4-Q Regen
control mode. The variable torque current rating is unavailable in this control mode.
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