One Way
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.
Regenerative
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.
