256 Rockwell Automation Publication 2198-UM001I-EN-P - May 2019
Appendix D Motor Control Feature Support
Motor Overload Retention
The motor overload retention feature protects the motor in the event of a drive
power-cycle, in which the motor thermal state is lost.
With motor overload retention, upon drive power-up the MotorCapacity
attribute initially reads:
• 20% if the motor is configured to use an integral thermal switch or an
integral motor winding temperature is available
• 50% if the motor is not configured to use an integral thermal switch or
an integral motor winding temperature is not available
If you have a separate monitoring algorithm within your Logix 5000â„¢
controller, you can use the InitialMotorCapacity attribute (3075)
10
or (C03)
16
to change the initial MotorCapacity value that the motor overload retention
feature populates.
• You can write to the InitialMotorCapacity attribute only in the Stopped
state after power-up
• You cannot write to the InitialMotorCapacity attribute after the first
time the axis is enabled following a power cycle.
Use a message instruction to write to the InitialMotorCapacity value.
In this example, the source element tag motorcapacity is a REAL Data type.
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