Efficient Plant Nov./Dec. 2022 - 24

motors
Record and
Verify Motor Data
Here are eight steps you can take to
document this data.
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Confirm that the motor is appropriate for the
application by verifying that its mechanical
and electrical characteristics are suitable for
the intended application.
For an adjustable-speed drive (ASD) or variable-frequency
drive (VFD) application, use
an " inverter-duty " motor (or provide suitable
filtering) and keep the supply-cable length
within the motor manufacturer's guidelines.
Use supply conductors designed for ASD
circuits to reduce the risk of over voltages
and transient voltages at the motor terminals,
and a shaft grounding system or insulated
bearings to prevent damage from stray shaft
currents.
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When recording motor data, include a photo of the nameplate for reference and to help avoid errors.
AN ESSENTIAL STEP to ensuring a quality installation and reliable operation of a
repaired or replacement motor is recording and verifying the motor data. Use a motor data
sheet to record the nameplate data and pertinent electrical and mechanical parameters at the
time of installation and startup. These baseline values will be invaluable for determining the
application's life-cycle cost and recognizing any changes in operating characteristics.
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Content adapted from EASA's, St. Louis (easa.com), Getting the Most from Your
Electric Motors. Access the full publication at go.easa.com/electricmotors.
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24 | EFFICIENTPLANTMAG.COM
Record the nameplate data. Serial numbers
are usually coded to indicate the month and
year of manufacture. For extra assurance,
attach a digital photo of the nameplate for
reference in case of errors in the recorded
data.
Make sure the motor's bearings are suitable
for the driven load, e.g., a drive end roller
bearing for high-radial load-belted application.
Review
the manufacturer's lubrication specifications
and ensure the lubrication points
are accessible.
Using a digital low-resistance ohmmeter,
record the temperature-corrected insulation
resistance of the motor and the line-to-line
resistance of the winding.
Verify that the motor control and overload
protection are sized properly for the motor
rating.
Inspect and test motors taken from storage to
ensure they haven't degraded. EP
NOV/DEC 2022

http://www.easa.com http://go.easa.com/electricmotors http://www.EFFICIENTPLANTMAG.COM

Efficient Plant Nov./Dec. 2022

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