Data Sheet

The default motor settings for the Tic T825.
The default motor settings for the Tic T834 are the same except for the decay mode, which is “Mixed
50%” by default.
Setting the current limit
Assuming that you are not limited by the Tic or your power supply, we recommend setting the current
limit of the Tic to the rated current of your motor. You should make sure the current limit is not higher
than what the Tic can deliver continuously (1500 mA for the T825 or T834 without a heatsink or forced
air flow), and make sure the current limit is not higher than half of the rated current of your motor
power supply (though this is not always necessary and a higher current limit could work, as explained
in Section 4.1). You should also make sure that the Tic’s configured current limit never exceeds the
rated current of your stepper motor.
The current limit is specified in the Tic Control Center in units of milliamps (mA), which are one
thousandth of an amp (ampere). So if you want to set your current limit to 0.9 A, you should enter “900”
in the “Current limit” field. Note that the current limit can only be set in increments of 32 mA to 128 mA
(the increments get bigger as the limit gets bigger), and the control center will use the closest valid
setting that is less than or equal to the desired current limit (e.g. 896 mA for a target limit of 900 mA).
Testing the motor for the first time
After setting the current limit, click “Apply settings”. There should be a message at the bottom of
the window that says “Motor de-energized because of safe start violation. Press Resume to start.”
Click the green “Resume” button to energize the stepper motor. If all goes well, the current you have
Tic Stepper Motor Controller User’s Guide © 2001–2018 Pololu Corporation
4. Setting up the controller Page 25 of 150