Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 117)

Application Profiles for the SMC Dialog Plus Controller 4-35
Figure 4.34 Grinder with Soft Start
Problem: Because of the high starting torque developed from
starting the motor across-the-line, the gears driving a
grinding wheel were frequently damaged, resulting in
unscheduled downtime for repair. This application
required a rugged device because vibration at the control
panel was a problem.
Solution: The SMC Dialog Plus controller was installed and
programmed for a 23-second acceleration, reducing the
starting torque and the downtime required for repairs.
The built-in Energy Saver feature reduced the voltage to
the motor when the motor was running lightly loaded.
The SMC Dialog Plus controller meets the same shock
and vibration requirements as electromechanical devices,
and therefore met the applications’ durability
requirements.
575 Volts
20 HP
Motor Gearbox
Grinding
Wheel