LEESON Chassis Mount Regenerative Control: 175721.00 - Manual (Page 10)

4
Regenerative Drives
Most non-regenerative, variable speed, DC drives control
current flow to a motor in one direction. The direction of current
flow is the same direction as the motor rotation.
Non-regenerative drives operate in Quadrant 1, and also in
Quadrant 3 if the drive is reversible (see Figure 3). Motors
must stop before reversing direction. Unless dynamic braking is
used, non-regenerative drives cannot oppose an overhauling
load, and cannot decelerate a load faster than coasting to a
lower speed.
Regenerative drives operate in two additional quadrants:
Quadrant 2 and Quadrant 4. In these quadrants, motor torque
is in the opposite direction of motor rotation.
Regenerative drives can reverse a motor without contactors,
switches, brake resistors, and inhibit plugs. They can also
control an overhauling load and decelerate a load faster than it
would take to coast to a lower speed.