Regeneration

Overview

Regeneration, or "shunting", dissipates energy from the DC bus during deceleration of the motor load. During deceleration, the motor acts as a generator that pumps energy back into the system. If this energy is not dissipated, then the bus energy level can exceed acceptable levels (VBUS.OVFTHRESH). If the system exceeds the maximum bus voltage, then the drive generates an over voltage fault ( F2006 ) and shuts down. A regeneration resistor is an external device that dissipates excess energy and allows the drive to function normally during deceleration.

Follow these steps to determine the regen needs for your system and to configure the drive for regen:

  1. Calculate motor peak and continuous regenerative energy and use this value to size the regen resistor.
  2. Select a compatible regen resistor.
  3. Configure regen parameter values in WorkBench.

From the Regen view, the following drive regen settings can be viewed and configured.

Button or Dialog Box Description Parameter

Regen Resistor Type

Sets the regen resistor type to either -1-External Regen or 0-Internal Regen (if available).

REGEN.TYPE

External Regen Resistance

Sets the external, user-defined regen resistor resistance (only visible for external regen).

REGEN.REXT

External Regen Heat Up Time

Sets the external regen resistor thermal protection time constant (only visible for external regen).

REGEN.TEXT

External Regen Power

Sets the regen resistor's power fault level for an external regen resistor (only visible for external regen).

REGEN.WATTEXT

Regen Power

Reads the regen power (only visible for external regen).

REGEN.POWER

Regen Resistor Options

Select "-1 External Regen" from the Regen. Resistor Type box (REGEN.TYPE ) to enter the external resistor settings. Fill in the appropriate values for your resistor.


  • If you use a nonstandard resistor, contact Kollmorgen technical support to confirm that the nonstandard resistor will work correctly with your system.

Related Parameters

REGEN Parameters

VBUS.OVWTHRESH

VBUS.VALUE

 

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