Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 16)

6 Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
Chapter 1 Product Overview
Preset Slow Speed
This option can be used in applications that require a slow-speed jog for general
purpose positioning. Preset Slow Speed provides either 7% of base speed (low) or
15% of base speed (high) settings in the forward direction. Reverse can also be
programmed and offers 10% of base speed (low) and 20% of base speed (high)
settings.
Figure 6 - Preset Slow Speed Option
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 to 5V DC) is required to perform
this start mode. The start time is selectable from 0 to 30 seconds and determines
the time the motor will ramp from 0 speed to full speed. Kickstart is available
with this option.
Figure 7 - Linear Speed Acceleration
IMPORTANT Slow speed running is not intended for continuous operation due to reduced
motor cooling. The two starts per hour limitation also applies to slow speed
operation. This option employs a cycle-skipping scheme which produces
limited torque. Applications should be checked with the factory.
Forward
15% – High
Time (seconds)
Start Run
10% – Low
Reverse
7% – Low
20% – High
100%
Motor
Speed
Run
Time (seconds)
Start Stop