EVAL6207N Datasheet, PDF (9/34 Pages) STMicroelectronics – PractiSPIN evaluation system configuration and set up guide

AN1794
Stepper motor drive
Note:
In the case of a strong static load (perhaps a gravity load of some sort) it may be necessary
to increase this setting. If not much holding torque is required, then the setting can be
reduced so that operating temperatures can be held to a minimum.
Holding current will be turned off (bridge completely disabled) whenever the disable button
is clicked.
13. Run: make sure that the motor is free to turn in either direction and click the run button.
The motor should quickly come up to speed ((100 steps/sec) / (1000 steps/sec2) = 0.1
sec.). To change the motor direction, click the direction toggle switch. If the motor does
not run click the stop button, increase all four current settings to 50%, and click run
button. If the motor still does not run an oscilloscope and current probe should be used
to observe the motor current.
14. Stop: click stop to stop the motor.
After the basic operation of the system has been verified, the acceleration rates, top speed,
and current settings can be adjusted to see how the motor responds.
3.2
Indexing mode
The system can be switched to operate in the positioning (indexing) mode by clicking on
"switch to INDEXING MODE". In the indexing mode a new box appears on the right of the
screen. You can enter up to twelve indexed movements in the box and the wait time between
each movement. When started, the software will execute each movement by accelerating up
to the peak speed, moving the required number of steps and then decelerating back to a
stop so that the total distance moved is the number of steps indicated, then wait the
indicated time before starting the next movement. A negative number entered in the relative
position will cause the motor to run in the "reverse" direction.
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