Rockwell Automation Publication 2198-UM005C-EN-P - February 2022 229
Appendix C 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 5000 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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