Parker Hannifin
Appendix B External Power-Dump Resistor Selection - 87 -
External Power Dump
Deceleration generates excess kinetic and potential energy. You can remove
the energy through regeneration—a process where the motor acts as
generator. Regeneration allows you to transfer the excess energy from the
motor and load back to the power supply.
When the drive/controller and assorted losses cannot remove all the stored
kinetic energy, you must connect an external power-dump resistor.
Connecting an external power-dump resistor to the drive/controller helps
dissipate the excess kinetic and potential energy.
While the drive/controller contains circuitry to control an external power dump
resistor, resistor selection depends on the requirements of your particular
application.
There are two methods for selecting the appropriate external power-dump
resistor:
• In this appendix, the section Simplified Resistor Selection provide
s
quick recommendations for Parker drive and motor combinations.
• The sections Resistor Specifications—Rotary Motors and Resistor
Specification
s—Linear Motors step you through the relevant formulas to
determine the needs of your particular application.
Note: Both methods assume regeneration occurs during a trapezoidal move.
Important — It is possible to overload a drive/controller or the combination
of a drive/controller and power dump resistor.
If, at the end of the calculations, you find the required resistor is less than
allowed for your specific Aries Controller model, or requires a wattage rating
greater than the rated resistors available, do not use the unit in your
application.
Drive/controller models AR-04CE, AR-08CE, and AR-13CE require external
resistance values of 22 Ohms or greater.
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