©2019 ALL-TEST Pro, LLC All Rights Reserved 43 Rev 06/20/2019
If a change from the baseline motor data, test each coil individually and compare the data from
like coils to all of the other like coils. All of the data from like coils should be the same. Any coil
that deviates from the average values of the other coils should be suspect.
Used Motors (Trending)
1) Take a complete set of motor data directly at the motor, (this will not be a true baseline,
since the condition of the motor is unknown) this motor data set will be the first data set
for trending. Follow the testing guidelines for the specific type of DC Motor
2) Install the motor, take a complete set of motor data from the DC motor drive (this will not
be a true baseline, since the condition of the motor is unknown) this motor data set will be
the first data set for trending. Follow the testing guidelines for the specific type of DC
motor.
3) Periodically monitor the DC motor from the controller and trend the data over time
beginning with the first motor data set taken on that particular machine, compare like coils
to like coils. If a significant change has occurred, disconnect the motor and test at the
motor directly.
4) Compare the current motor data taken directly at the motor to the first data set taken
directly at the motor.
5) If a change from the first motor data, test each coil individually and compare the data from
like coils to all of the other like coils. All of the data from like coils should be the same. Any
coil that deviates from the average values of the other coils should be suspect.
Like Motors (Average)
1) Take a complete set of motor data directly at the motor from 3 or more identical motors in
both size and type. Follow the testing guidelines for the specific type of DC Motor. Take
the average of the motor winding by winding type. All shunt coils should be averaged with
shunt coils, series coils averaged with series coils, etc.
Note: Even if some motors look similar, they are actually different. This can be proved when
there is significant difference among the measurements on the similar coils.
2) Install the motor, take a complete set of motor data from the drive from 3 or more
identical motors; (both size and type) follow the testing guidelines for the specific type of
DC Motor. Take the average of the motor winding by winding type. All shunt coils should
be averaged with shunt coils, series coils averaged with series coils, etc.
3) Periodically monitor the DC motor from the controller and compare the new average data
to previously data. If a change has occurred, disconnect the motor and test at the motor
directly.
4) Compare the current motor data taken directly at the motor to the baseline average data
set previously taken directly at the motor for those machines.
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