Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) - Manual (Page 26)

26 Rockwell Automation Publication 7760-UM001D-EN-P - October 2014
Chapter 1 Product Overview
Linear Speed Acceleration and Deceleration
The SMC Flex has the ability to control the motor speed during starting and
stopping maneuvers. A tachometer signal (0…5V DC) is required to perform this
start mode. The start time is selectable from 0…30 seconds and determines the
time the motor will ramp from 0 speed to full speed. Kickstart is available with
this option.
Figure 12 - Linear Speed Acceleration
Linear deceleration does not need to be used, even if linear acceleration is used.
The stop time can be programmed for 0…120 seconds. Linear deceleration
cannot brake the motor/load and reduce the stop time.
Note: Consult factory if settings over 30 seconds are required. The base rating of
the MV SMC Flex is two starts (or one start/stop combination) per hour,
30 seconds maximum for each operation. A stopping operation counts as a start
for purposes of thermal capacity calculations.
100%
Start Run Stop
100%
Start
Time (seconds)
Motor
Speed
Run Stop
IMPORTANT Linear Deceleration is not intended to be used as an emergency stop. Such
usage may result in severe injury or death. Refer to the applicable standards for
emergency stop requirements.