Rockwell Automation Publication PFLEX-AT001L-EN-P - September 2017 33
Chapter 4
Selecting An External Resistor for
PowerFlex 7-Class Drives
How to Select an External
Dynamic Brake Resistor for
PowerFlex 7-Class Drives
In order to select the appropriate External Dynamic Brake Resistor for your
application, the following data must be calculated.
Peak Regenerative Power
(Expressed in watts)
This value is used to determine the maximum resistance value of the Dynamic
Brake Resistor. If this value is greater than the maximum imposed by the peak
regenerative power of the drive, the drive can trip off due to transient DC bus
overvoltage problems.
Power Rating of the Dynamic Brake Resistor
The average power dissipation of the regenerative mode must be estimated and
the power rating of the Dynamic Brake Resistor chosen to be greater than the
average regenerative power dissipation of the drive.
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