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Rockwell Automation Publication 150-QS003D-EN-P - November 2013 47
Chapter
4
Operation and Troubleshooting
Operation
The SMC-50 can operate standard squirrel-cage 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. The motor tuning feature of the
SMC-50 will automatically determine the motor connection. Motor tuning is
done automatically by the controller on initial motor start or forced to occur by
the user. The user can also enter the configuration of the Motor Connection,
Parameter 44, into the SMC-50. The Motor Line Voltage rating, Parameter 46,
must be entered into the controller by the user to enable the motor protection
features to function (default 480V).
Motor Tuning
The SMC-50 will perform 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
uses the motor tuning data in its control algorithm.
During the tuning process the motor will not turn and will make some audible
noise including pulsing and buzzing. The time to complete the tuning process is
approximately 10 to 20 seconds but may vary based on the size and characteristics
of the individual motor being used. After successful completion of the tuning
process the motor will start based on the user programmed start profile. If the
tuning process is interrupted by the user giving a stop command or removing
power from the unit the tuning process will be repeated on the next start
command. Subsequent starts of the motor after a successful tuning will not
perform the tuning process.
After the initial successful tuning of the motor the process may be re-initiated by
the user via one of the following methods:
1. Change the status of the Force Tuning, Parameter 194, to TRUE by using
a configuration tool (e.g., a HIM) with the motor stopped. During the
next start cycle, the tuning process will occur and Parameter 194 will
change back to FALSE.
IMPORTANT
Verify line and control as the voltage values on the product before
applying power.