Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 13)

Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013 3
Product Overview Chapter 1
SMC Flex™ Control Module
The MV SMC Flex controller offers a full range of starting and stopping modes
as standard:
• Soft Start with Selectable Kickstart
• Soft Stop
• Current Limit Start with Selectable Kickstart
• Linear Acceleration with Selectable Kickstart
• Linear Deceleration
• Dual Ramp Start
• Preset Slow Speed
(1)
• Full Voltage Start
Other features that offer further user benefit include:
• Extensive protection features
• Metering
• Communication capability
• I/O
Innovative control option provides enhanced performance:
• Pump Control (Start and Stop Control modes)
These modes, features and options are further described in this chapter.
Starting Modes Soft Start
This mode has the most general application. The motor is given an initial torque
setting, which is user-adjustable from 0 to 90% of locked-rotor torque. From the
initial torque level, the output voltage to the motor is steplessly increased during
the acceleration ramp time. The acceleration ramp time is user-adjustable from 0
to 30 seconds. Once the MV SMC Flex controller senses that the motor has
reached the up-to-speed condition during the voltage ramp operation, the output
voltage automatically switches to full voltage, and the bypass contactor is closed.
Figure 1 - Soft Start
(1) This option utilizes gating patterns which result in motor and line currents that produce noise and vibration in the motor and/or
distribution transformer. This must be considered before applying this option.
Percent
Voltage
100%
Initial
Torque
Start
Time (seconds)
Run