Rockwell Automation Publication 2071-IN001F-EN-P - February 2017 17
Kinetix 3 Component Servo Drives
Motor Overload Protection
This servo drive uses solid-state motor overload protection that operates in accordance with
UL 508C. Motor overload protection algorithms (thermal memory) that predict actual motor
temperature that is based on operating conditions as long as control power is continuously
applied. However, when control power is removed, thermal memory is not retained.
This drive also provides an input for an external temperature sensor or thermistor device, which
is embedded in the motor, to support the UL requirement for motor overload protection.
The drive supports some motors that do not contain temperature sensors or thermistors;
therefore, motor overload protection against excessive consecutive motor overloads followed by
power-up is not supported.
This servo drive meets the following UL 508C requirements for solid-state overload protection.
See your servo drive user manual for the interconnect diagram that illustrates the wiring between
your motor and drive.
Motor Overload Protection Trip Point Value
Ultimately 100% overload
Within 8 minutes 200% overload
Within 20 seconds 600% overload
ATTENTION: Avoid overheat damage to your motor from excessive and successive motor
overload faults by following the motor and drive-combination wiring diagram that is provided in
the user manual.
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