Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 112)

4-30 Application Profiles for the SMC Dialog Plus Controller
Figure 4.29 Towline Conveyor with Soft Start and Soft Stop Option
Problem: A towline conveyor at the end of a production line had
frequent damage to the gearbox caused by the starting
torque from across-the-line starting of the motor. There
were also frequent spills during starting and stopping.
Occasionally, the conveyor needed to be started under
heavy load. This towline application had a variety o
starting requirements that other soft starters could not
satisfy. Investing in a variable speed drive was not cost
effective.
Solution: The SMC Dialog Plus controller with the Soft Stop
option was installed as a retrofit to the existing across
the-line starter. The starting and stopping times wer
programmed for 13 seconds. The reduced starting torqu
decreased the shock to the gearbox and kept the load
from shifting on start-up. The Soft Stop option protected
against loads shifting while stopping. The kickstart
feature was used to provide a pulse of current to break the
load away when higher starting torque was required. The
SMC Dialog Plus controller met the starting
requirements and was a cost-effective solution.
Load Load
Pallet
Gearbox
Motor
480 Volts
15 HP