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.
