Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 20)

10 Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
Chapter 1 Product Overview
Underload
(4)
Utilizing the underload protection of the MV SMC Flex controller, motor
operation can be halted if a sudden drop in current is sensed.
The MV SMC Flex controller provides an adjustable underload trip setting from
0 to 99% of the programmed motor full load current rating. Trip delay time can
be adjusted from 0 to 99 seconds.
Undervoltage
(5)
Utilizing the undervoltage protection of the MV SMC Flex, motor operation can
be halted if a sudden drop in voltage is detected.
The MV SMC Flex controller provides an adjustable undervoltage trip setting
from 0 to 99% of the programmed motor voltage. Trip delay time can be adjusted
from 0 to 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 LCD, HIM, Communication (if applicable) and alarm contact
closing.
Overvoltage
(5)
Utilizing the overvoltage protection of the MV SMC Flex, motor operation can
be halted if a sudden increase in voltage is detected.
The MV SMC Flex controller provides an adjustable overvoltage trip setting
from 0 to 199% of the programmed motor voltage. Trip delay time can be
adjusted from 0 to 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 LCD, HIM, Communication (if applicable) and alarm contact
closing.
(4) Underload protection is disabled during slow speed and braking operations.
(5) Undervoltage, overvoltage and voltage unbalance protection are disabled during braking operation.
TIP For medium voltage applications, undervoltage protection should be set from
80 to 99%.
TIP For medium voltage applications, overvoltage protection should be set from
100 to 115%.