ElmoMC SimplIQ Digital Servo Drives-Bell Command Reference - Manual (Page 234)

Example:
The following graph depicts the signals related to the current command limiting process
for MC=6, PL[1]=6, PL[2]=3 and CL[1]=3.
0 1 2 3 4 5 6 7 8 9
0
1
2
3
4
5
6
A pplication current dem and
m otor current
comm and
F ilter state
LC current limit
Indication
The application motor current command increases from 0 to 6 amperes at the time of 0
seconds, and then decreases to 0 at the time of 5 seconds.
The state of the filter (averaged RMS current) increases until it reaches the continuous current
limit of 3Amp at the time of 3 seconds. At that time, the LC flag is raised and the motor
current command decreases to 3 Amperes.
After the motor current command is set to zero, the state of the filter begins to drop.
When it drops to 2.7 amperes = 90% of 3 amperes, the LC flag is reset and the torque
command limiting returns to 6 amperes.
5.2. Sensor Faults
5.2.1 Motor Does Not Move Protection
When the motor is unable to complete a command to move, the reasons may be:
The motion sensor is faulty: The motor moves but motion is not detected. In this case,
AC motors will generally stop, because the stator field will remain stationary.
The motor is faulty or another mechanical failure is preventing the motor from moving.
SimplIQ for Steppers Application Note Commutation and Pole Identification
MAN-STECR (Ver. 1.1)
35