Rockwell-automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE Manual de usuario descargar pdf (Pagina 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

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 201 202

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Rockwell-automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE Manual de usuario Pagina 115