Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 31)

Rockwell Automation Publication 7760-UM001D-EN-P - October 2014 31
Product Overview Chapter 1
Unbalance
The MV SMC Flex is able to detect an unbalance in line voltages. Motor
operation can be halted if the unbalance is greater than the desired range.
The MV SMC Flex controller provides an adjustable unbalance setting from
0…25% of the line voltages. 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 LCD, HIM, Communication (if applicable) and alarm contact
closing.
Undervoltage, overvoltage, and voltage unbalance protection are disabled during
braking operation.
Stall Protection and Jam Detection
The MV SMC Flex controller provides both stall protection and jam detection
for enhanced motor and system protection.
• Stall protection is user-adjustable from 0.0…10.0 seconds (enabled only
after the programmed start time expires). It is recommended that it be set
at 1.0 second.
• 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.
• Jam detection allows the user to determine the jam level (up to 1000% of
the motor's full-load current rating) and the delay time (up to
99.0 seconds) for application flexibility.
Figure 16 - Stall Protection
Percent
Full Load
Current
Programmed Start Time Stall
Time (seconds)