Application Note 1829
4
AN1829.0
March 14, 2013
alternative to cycling power, the reset push button can be
pressed to re-read the dip switch settings.
8. Press the Start/Stop push button once. The RUN LED (led0)
will blink, indicating that the motor has been started. The
motor at this point may not be rotating because minimal
voltage is being applied to the motor.
9. Slowly increase the voltage on the motor by rotating the
potentiometer, R13, to the right (CW). At some point the
motor will start to rotate slowly. The actual starting voltage is
dependent on the specific motor being used.
10. If the motor is vibrating back and forth instead of rotating, it
is possible that the Hall sensors or the motor leads were not
connected correctly. If the correct switching sequence has
been selected, all that should be necessary to correct this
misbehavior is to swap two of the motors lead (or to swap two
of the Hall sensor leads).
11. Continue to rotate the pot until the motor is running at a
moderate speed of roughly 25%. Do not run the motor with
maximum voltage until the setup check-out is completed.
12. Press again the START/STOP push button. The motor will free
wheel to a stop and the blinking led0 will turn off.
13. Press again the START/STOP button. The motor will
accelerate to the previous run speed (assuming that the
potentiometer was not rotated). The blinking led0 will also
turn on.
14. While the motor is running, press the REVERSE button. The
RUN LED (led0) will turn off and the REVERSE LED (led1) will
turn on without blinking. After a short pause while the motor
is freewheeling to a stop, the motor will restart rotating in the
opposite direction. The RUN LED will be blinking and the
REVERSE LED will continue to be on.
15. Press again the REVERSE button. As before, the motor will
stop. But this time the REVERSE LED will turn off. After a
pause, the motor will restart but this time rotating in the
forward direction.
16. While the motor is running, the motor can be hard braked by
pressing the BRAKE push button. The BRAKE LED (LED2) will
be on without blinking. When the motor is restarted, the
BRAKE LED will turn off.
CAUTION:
The braking method implemented turns on all of the
low-side bridge FETs simultaneously. This will force the motor to
a very rapid stop. If the motor is loaded, or if the motor is not
designed for a rapid stop, mechanical damage to the motor or
the load can result. If you are not sure about using this braking
method, only apply the brake when the motor speed is relatively
slow.
17. If while operating, the motors turns off, and the iLIMIT LED
(led3) is blinking, the current limit shut-down has been
activated after 255 consecutive pulse-by-pulse current limits.
This may happen if the motor speed is accelerated too
quickly, or if there is a fault with the motor or connections, or
if the motor is stalled.
It is now safe to proceed with testing at higher power levels
speeds.
led0
led2
led3
led1
At initial turn on, leds will turn on and
off one at a time starting with led0
led0
led2
led3
led1
While the motor is rotating, the RUN LED is blinking
RUN
REVERSE
BRAKE
I
LIMIT
led0
led2
led3
led1
RUN
REVERSE
BRAKE
I
LIMIT
led0
led2
led3
led1
RUN
REVERSE
BRAKE
I
LIMIT
led0
led2
led3
led1
RUN
REVERSE
BRAKE
I
LIMIT
blinking
led0
led2
led3
led1
RUN
REVERSE
BRAKE
I
LIMIT
led0
led2
led1
RUN
REVERSE
BRAKE
I
LIMIT
led3
