Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 18)

1-10 STC Starting Torque Controller
Applications (cont.)
Figure 1.12 Crane with Torque Control
Problem: An overhead crane required frequent jogging due to
adjustments in the traverse (horizontal) position. An
across-the-line starter was used and this caused overshoot
or undershoot when trying to position over a load.
Solution: The STC controller was installed in the application. By
reducing the starting torque of the motor, this allowed th
crane to be positioned effectively. This meant fewer
starts were required to position the crane over the load.
This solution reduced the maintenance required as well
as improved the productivity of the crane. The STC
controller was a cost effective solution.
Traverse Motor (STC Controlled)
480 Volts
2 HP
Track
Load