Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018 395
When employing an overload protection method based on a motor thermal
model, the Motor Capacity attribute value represents how much of the motor's
rated thermal capacity, associated with the motor thermal model, has been
utilized. Once the Motor Capacity value exceeds the Motor Overload Limit, the
drive can optionally trigger a predetermined Motor Overload Action.
The Motor Overload Limit can also used by the drive to determine the absolute
thermal capacity limit of the motor, for example, the Motor Thermal Overload
Factory Limit, that if exceeded, generates a Motor Thermal Overload FL
exception.
Motor Integral Thermal Switch
Usage Access Data Type Default Min Max Semantics of Values
Optional Set/GSV BOOL 0
DB
0 1 0 = No
1 = Yes
The Motor Integral Thermal Switch attribute is a Boolean value that specifies if
the motor has an integral thermal switch to detect a Motor Overtemperature
condition. Connection to the motor thermal switch can be through the motor
feedback interface, associated with Axis I/O Status bit, Feedback 1 Thermostat, or
through a discrete digital input to the drive, associated with Axis I/O Status bit,
Motor Thermostat. The method of interface to the thermal switch is left to the
drive vendor's discretion.
Motor Max Winding Temperature
Usage Access Data Type Default Min Max Semantics of Values
Optional Set/GSV REAL 0
DB
0
°C
The Motor Max Winding Temperature attribute is a floating point value that
specifies the maximum winding temperature of the motor.
Motor Winding to Ambient Capacitance
Usage Access Data Type Default Min Max Semantics of Values
Optional Set/GSV REAL 0
DB
0
Joules/°C
The Motor Winding to Ambient Thermal Capacitance attribute is a floating
point value that specifies the winding-to-ambient thermal capacitance.
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