DYNAMIC BRAKING RESISTOR
What is DBR?
- It consists of a Heavy duty Resistor, Powered through a Chopper.
- On sensing rise in DC Voltage, DBR connects on its own, dissipating excess Regenerative Energy. Once DC Voltage returns to normal range, DBR get disconnects immediately.
- DBR can be set in such a way that it will allow Battery to charge with Regenerative Energy. If absorbs excess Energy left after consumed by battery
What is Regenerative Energy?
- During braking of Elevator, the Motor
restores part of kinetic energy. - New generation of Elevators uses IGBT
Modules in their Drive, Which transforms
restored Kinetic Energy into Electrical Energy
and feed it back to Source. - This Energy is called as Regenerative
Energy. It results in rise of DC bus Voltage of
Inverter, causing tripping of Inverter and
further resulting in heavy jerks in Elevator. - These Jerks shall be prevented for safety of
Passengers. - This Energy will be so high that Battery could
not absorb, allowing it to rise.
