One Way DC controls are designed to operate permanent magnet or wound field
motors. If the motor's rotation needs to be changed, the armature leads need
to be reversed. Some NEMA 1 and NEMA 4X controls offer optional switched for
reversal. Stopping of a motor with a one-way control should be done by
dynamic braking, some controls offer the Forward-Brake-Reverse switch for
this purpose too.
Regen controls are designed to easily operate the motor in forward and
reverse directions without motor lead reversal. A separate set of SCRs is
used for each direction. With a regen control, stopping is controlled by
using the motor's regenerated voltage sent back to the AC line.