Re: brushless dc motor MRES IS N/A

["Peterson, Kevin M. via Tech-talk" <tech-talk at aps.anl.gov>]

There are multiple reasons why the MRES should be set to the ERES for DC brushless motors:

* The MRES, not the ERES, is used by the motor record to convert velocities and accelerations from EGU into controller units
* The MRES, not the ERES, is used to synchronize the raw limit fields with the dial and user limit fields
* The absolute value of the MRES is used as the minimum retry deadband
* The MRES, not the ERES, is used to calculate the raw position to send to the controller when the motor record's dial position is being redefined
* If a user changes UEIP to "No", the motor will still work if MRES == ERES (assuming the motor driver sets both the RMP and REP to the same value)

Kevin

________________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Tran, Phi Dung via Tech-talk <tech-talk at aps.anl.gov>
Sent: Thursday, December 19, 2024 10:10 AM
To: tech-talk at aps.anl.gov
Subject: brushless dc motor MRES IS N/A

hI,
I am using a DC brushless motor with an encoder. For the motor record, I will define ERES and set UEIP to YES. That's it; my MRES is not applicable therefore, I will not include this field..
However, experts have advised that I should set MRES equal to ERES. What is the rationale behind this? Is it to ensure that when UEIP is set to NO, the motor still operates correctly?
Alex