Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 30)

30 Rockwell Automation Publication 7760-UM001D-EN-P - October 2014
Chapter 1 Product Overview
Underload
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…99% of the programmed motor full load current rating. Trip delay time can be
adjusted from 0…99 seconds.
Underload protection is disabled during slow speed and braking operations.
Undervoltage
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…99% of the programmed motor voltage. Trip delay time can be adjusted
from 0…99 seconds.
Note: For medium voltage applications, undervoltage protection should be set at
or above 80%.
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
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…199% of the programmed motor voltage. Trip delay time can be adjusted
from 0…99 seconds.
Note: For medium voltage applications, overvoltage protection should be set at
or below 110%.
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.
Undervoltage, overvoltage, and voltage unbalance protection are disabled during
braking operation.