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Selecting Dynamic Braking Resistors

November 2002

Dynamic Braking for an R type DC elevator drive is used only when the DC loop contactor is opened during mid flight in order to cause an Emergency Stop.

The DB resistor does not need to be rated for continuous use as it only needs to absorb the kinetic energy of the moving elevator during an E-Stop, with long cooling times allowed between uses. Choosing a rugged resistor style will allow a large peak power to be dissipated by the resistor, beyond its normal continuous rating.

For detailed guidelines: Application Note DSD 412 Selecting Dynamic Braking Resistors
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