Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 115)

Application Profiles for the SMC Dialog Plus Controller 4-33
Figure 4.32 Shuttle Car with Soft Start and Accu-Stop Option
Problem: A shuttle car was used to transfer product in a materiel
handling application. The shuttle car OEM was using a
two-speed motor with a mechanical brake. To prevent
load shifts, the low speed was used when the shuttle was
started; high speed was used for running. As the car
approached the second station, the brake was applied.
There was considerable brake wear. Because the brak
was built into the motor, it was difficult and costly to
replace. Other control devices were not cost effective.
Solution: The SMC Dialog Plus controller with the Accu-Stop
option was installed with a single speed motor. The
controller was set for a 15% slow speed to start the car,
followed by a ramp to full voltage. As the car neared th
second station, the speed would be brought down to the
15% slow speed. A braking action would then stop the
car completely. The controller required approximately
the same panel space as the multi-speed starter. The
power wiring was simplified significantly. The new
motor was a standard NEMA Design B stocked motor,
greatly decreasing the motor cost. The SMC Dialog Plus
controller was a cost effective solution for the application
requirements.
Motor
480 Volts
7.5 HP
Gearbox
Load Load