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AX2550 Motor Controller User’s Manual 53
Self-Test Mode
When the input is pulled high, all the power MOSFETs are turned Off so that the motors
are effectively disconnected from the controller.
This function is typically used to create a “dead man switch” when the controller is driven
using an analog joystick. The motors will be active only while the switch is depressed. If
the switch is left off for any reason, the motors will be disconnected and allowed to free-
wheel rather than coming to an abrupt stop.
Self-Test Mode
The AX2550 incorporates a simple Self-Test mode that performs the following functions:
• Display the software revision number on the LED display
• Ramp each motor up and down in both directions
• Internal parameters on the serial port output
The Self Test mode can be conveniently initiated using only the controller’s switches so
that no radio or computer is needed.
To enter the Self Test mode, press and hold the Set button while resetting or powering up
the controller.
After a few seconds, the LEDs will display a sequence of two numerical digits and an
optional letter separated by dashes as shown in the examples below.
After these digits are displayed, the controller will attempt to power the motors. Motor 1
will be ramped from stop to full speed forward to full speed reverse and back to stop. Then
the same operation will repeat on motor 2. After both motors have completed their ramps,
the software revision will be displayed again and the motors will be ramped again. This
sequence will repeat itself indefinitely until the controller is powered off or reset.
While in the Self Test mode, the AX2550 will continuously send a string of characters on
the RS232 output line. This string will contain 12 or 13 two-digits hexadecimal number rep-
resenting the 13 following operating parameters.
• Captured R/C Command 1 and 2
• Power Applied to Controller’s output stage
• Values applied to Analog inputs 1 and 2
• Amps on channel 1 and 2
• Internal Heat Sink temperatures 1 and 2
• Main Battery voltage
• Internal 12V voltage
= Software version 1.9b
FIGURE 25. Press and hold “Set” to display version number and enter self-test