16 Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019
Chapter 1 Product Overview
Sensorless Linear Speed Acceleration
With this type of starting mode, the motor acceleration is at a constant rate. The
controller accelerates the motor in a linear fashion from the off (0 speed)
condition to full speed condition in the time configured in the user-defined ramp
time. This is done using a proprietary motor speed feedback algorithm to sense
motor speed.
• NOTE: An external speed sensor is NOT required.
This starting mode presents the least amount of stress on mechanical
components. An initial torque value is configured to define a motor starting
value. A current limit value is also available to limit the starting current
throughout the linear acceleration start maneuver.
Figure 2 - Linear Speed Acceleration Timing Diagram
% Speed
Ramp Time
100%
Current Limit
Time (seconds)
Start Run Stop
Stop Time
Linear Acceleration Linear Deceleration
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