Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 27
Product Overview Chapter 1
Underload Protection
Utilizing the underload protection of the SMC-50 module, motor operation can
be halted if a sudden drop in current is sensed.
The SMC-50 control module provides an adjustable underload trip setting from
0…99% of the programmed motor full load current rating. Trip delay time can be
adjusted from 0…99 seconds.
Undervoltage Protection
Utilizing the undervoltage protection of the SMC-50, motor operation can be
halted if a sudden drop in voltage is detected.
The SMC-50 module provides an adjustable undervoltage trip setting from
0…99% of the programmed motor voltage. Trip delay time can be adjusted from
0…99 seconds.
An alarm (pre-fault) indication level can be programmed to indicate the unit is
getting close to faulting. The alarm modification information is displayed
through the HIM, Communication (if applicable), and alarm contact closing.
Overvoltage Protection
Utilizing the overvoltage protection of the SMC-50, motor operation can be
halted if a sudden increase in voltage is detected.
The SMC-50 module provides an adjustable overvoltage trip setting from
100…199% of the programmed motor voltage. Trip delay time can be adjusted
from 0…99 seconds.
An alarm (pre-fault) indication level can be programmed to indicate the unit is
getting close to faulting. The alarm modification information is displayed
through the HIM, Communication (if applicable), and alarm contact closing.
TIP For medium voltage applications, undervoltage protection should be set from
80…99%.
TIP For medium voltage applications, overvoltage protection should be set from
100…115%.
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