Rockwell Automation 1560E SMC Flex Smart Motor Controller - Manual (Page 65)

Installation 2-17
Motor Overload Protection Thermal motor overload protection is provided as standard (though it must
be programmed) with the MV SMC-Flex controller. If the overload trip
class is less than the acceleration time of the motor, nuisance tripping may
occur.
Overload protection should be properly coordinated with
the motor to avoid damage to equipment.
Two special applications require consideration: Two-speed Motors, and
Multi-motor Protection.
Two-speed Motors
The MV SMC-Flex controller has overload protection available for single
speed motors. When the MV SMC-Flex controller is applied to a two-speed
motor, the Overload Class parameter must be programmed to OFF, and
separate overload relays must be provided for each speed.
Multi-motor Protection
The MV SMC-Flex controller provides overload protection for only one
motor. When the MV SMC-Flex is controlling more than one motor, the
Overload Class Parameter must be programmed to OFF, and individual
overload protection is required for each motor.
A T T E N T I O N A T T E N T I O N