Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 101)

Application Profiles for the SMC Dialog Plus Controller 4-19
Figure 4.18 Hammermill with Current Limit Start and
SMB Smart Motor Braking Option
Problem: A hammermill required a reduced voltage start because
of power company restrictions. A stopping time less than
the present five minute coast-to-rest was desired. To save
panel space, the customer wanted to incorporate both
starting and stopping control in the same device.
Solution: The SMC Dialog Plus controller with the SMB Smart
Motor Braking option was installed. A 23-second, 450%
current limit acceleration was programmed, meeting the
power company requirements and reducing the
mechanical stress on the belts during start-up. Th
braking function was accomplished without additional
power wiring, panel space, or contactors. Zero speed was
detected without additional sensors or timers. The
current limit start, braking, and overload protection were
accomplished within the same modular package.
480 Volts
200 HP
Belts
Motor
Feed
Hammer