Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 90)

4-8 Application Profiles for the SMC Dialog Plus Controller
Figure 4.7 Bandsaw with Soft Start
Problem: Because of the remote location of the facility and powe
distribution limitations, a reduced voltage starter was
needed on a bandsaw application. The saw was turned
off only during shift changes. When the saw blade
became dull, the current drawn by the motor increased.
Therefore, an ammeter was required. Metering th
application for jam conditions was a necessity. In
addition, single phasing of the motor was a problem
because of distribution limitations.
Solution: The SMC Dialog Plus controller was installed to provid
a reduced voltage start. This minimized the starting
torque shock to the system. The Energy Saver feature
was activated whenever the bandsaw was running lightly
loaded. The current monitoring and jam detection
features of the SMC Dialog Plus controller were
implemented, saving valuable panel space and the cost o
purchasing dedicated monitoring devices. The
controller’s built-in programmable overload protection
was utilized. The SMC Dialog Plus controller’s
diagnostic capabilities would detect single phasing and
shut the motor off accordingly.
Saw Blade
Motor
High Inertia Wheels
Carriage
Log
480 Volts
300 HP