How do I configure my shunt resistor in MotionLab3?

Initial Clarifications

The article you are about to read only applies to Summit products (Everest, Capitan & Denali).

Requirements

This article assumes that the shunt braking resistor in your system has been properly dimensioned from your side. If that is not the case, please refer to the following link in order to get a calculation of the exact shunt resistor that your axis will require: Dimensioning a Shunt Resistor for Regenerative Braking.

Taking care of the wiring and external circuitry

First of all, it is important to clarify that Summit servo drives do not have a shunt regulator transistor so it is always required to have an external circuitry handling the activation and deactivation of the shunt.

Everest/Capitan/Denali XCR servo drives

For the XCR drives, you can find details on how to wire the external circuitry to the drive in the following links and the screenshot below:

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Everest/Capitan/Denali NET servo drives

For the NET drives, you can check the application guide on how to design this shunt circuitry on your PCB board:

Everest/Capitan/Denali CORE servo drives

For the NET drives, you can check the application guide on how to design this shunt circuitry on your PCB board:

Configuration of the shunt resistor in the drive

Once the above is taken care of, there is a very small set of registers that need to be configured in order to be able to trigger the activation of the external shunt resistors. These registers are:

 

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