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Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019
Chapter 2
Installation
• The capacitance in combination with the line and motor impedance could
also be excited by the voltage steps from SCR switching to create resonant
voltage swings which could exceed the device voltage withstanding ratings
or surge arrester rating, or cause distorted voltage signals which may be
misinterpreted by the SMC-50 control system.
Motor Overload Protection
Thermal motor overload protection is provided as standard (though it must be
programmed) with the SMC-50 control module. If the overload trip class is less
than the acceleration time of the motor, nuisance tripping may occur.
Two special applications require consideration: Two-speed Motors, and Multi-
motor Protection.
Two-speed Motors
The SMC-50 control module has overload protection available for single speed
motors. When the SMC-50 control module 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 SMC-50 control module provides overload protection for only one motor.
When the SMC-50 is controlling more than one motor, the Overload Class
Parameter must be programmed to OFF, and individual overload protection is
required for each motor.
ATTENTION:
Overload protection should be properly coordinated with the
motor to avoid damage to equipment.
Summary of Contents for SMC-50
Page 10: ...10 Rockwell Automation Publication 1560F UM001A EN P June 2019 Table of Contents Notes ...
Page 12: ...12 Rockwell Automation Publication 1560F UM001A EN P June 2019 Preface Notes ...
Page 68: ...68 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 2 Installation Notes ...
Page 120: ...120 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 4 Programming Notes ...
Page 130: ...130 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 5 Metering Notes ...
Page 156: ...156 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 8 Diagnostics Notes ...
Page 198: ...198 Rockwell Automation Publication 1560F UM001A EN P June 2019 Chapter 10 Maintenance Notes ...
Page 284: ...284 Rockwell Automation Publication 1560F UM001A EN P June 2019 Appendix H Spare Parts Notes ...
Page 286: ...286 Rockwell Automation Publication 1560F UM001A EN P June 2019 Appendix I Accessories Notes ...
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