Rockwell Automation Publication 150-QS003E-EN-P - April 2017 29
Chapter 3
Operation and Troubleshooting
Operation
SMC-50 controllers with integrated bypass can operate standard line-
connected induction motors rated 27…480 A or star-delta (wye-delta) type
motors rated 47…831 A that are operated inside-the-delta.
The SMC-50 solid-state controller can operate line-connected induction
motors rated 30…520 A or star-delta (wye-delta) type motors rated 52…900 A
operated inside-the-delta.
Motor Configuration
Line-connected wye, line-connected delta, and inside-the-delta motor
configurations are possible with the SMC-50 controller. The motor-tuning
feature of the SMC-50 controller automatically determines the motor
connection. Motor tuning is done automatically by the controller on initial
motor start or forced to occur by the user. You can also enter the configuration
of the Motor Connection, Parameter 44, into the SMC-50 controller. You
must enter the Motor Line Voltage rating, Parameter 46, to enable the motor
protection features to function (default 480V).
Motor Tuning
The SMC-50 controller performs the motor-tuning process on the initial start
sequence of the motor. Motor tuning includes the identification of the motor
parameters and the detection of the motor connection type (line or delta). The
SMC-50 controller uses the motor-tuning data in its control algorithm.
During the tuning process, the motor makes some audible noise, including
pulsing and buzzing. The time to complete the tuning process is approximately
10…20 seconds, but varies based on the size and characteristics of the
individual motor being used. After successful completion of the tuning process,
the motor starts based on the user-programmed start profile. If you interrupt
the tuning process by giving a stop command or removing power from the unit,
the tuning process repeats on the next start command. Subsequent starts of the
motor after a successful tuning do not perform the auto-tuning process.
After the initial successful tuning of the motor the process, you can reinitiate it
via one of the following methods:
IMPORTANT Verify line and control voltage values on the product before you apply
power.
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