24 Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019
Chapter 1 Product Overview
Motor and Starter
Protection Features
The SMC-50 control module provides
both motor and starter alarms and faults.
An alarm condition is intended to provide
an alert that a potential system issue, or
fault is pending to allow time to take
corrective action. A fault is intended to
protect equipment from damage by
shutting that equipment down and/or
removing power. The SMC-50 module lets
you individually enable or disable motor
and starter alarms and faults by bit (On/
Off ) selection. Alarm and fault trip points
are typically user-configurable to allow for
application dependence. In addition, many
alarms and faults provide a separate user-
configurable alarm and fault time delay
parameter to limit nuisance trips and shutdowns.
The SMC-50 module has a separate Fault Buffer and Alarm Buffer to maintain a
Fault/Alarm history. In addition to the fault/alarm code and description, a time
and date stamp is provided by the SMC-50 controller's Real Time Clock (RTC).
The Fault Buffer holds the last five faults which provide the time and date; the
Alarm Buffer holds the last 100 alarm events which detail the time, date,
parameter change, Start, Stop, Coast, Operation, Alarm, Fault, and Fault Reset.
As standard, the SMC-50 module enables manual reset of a fault from the
PUSH-TO-RESET/HOLD-TO-TEST button, located adjacent to the LED
status indicator. Fault indication and reset can also be performed from a panel-
mount HIM or from PC software (such as Connected Components
Workbench™ software).
Protection Feature Page
Overload Protection 25
Underload Protection 27
Undervoltage Protection 27
Overvoltage Protection 27
Voltage Unbalance Protection 28
Current Imbalance 28
Stall Protection and Jam Detection 28
Ground Fault 29
Thermistor/PTC Protection 30
Open Gate 31
Line Faults with Phase Indication 31
Excessive Starts/Hour 32
Overtemperature 32
Overcurrent Protection 32
Total Harmonic Distortion (THD) Fault and Alarm 32
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