RoboteQ AX3500 Left/Right Tuning Adjustment, Joystick Calibration, Command Control Curves

R/C Operation

	Deadband
Min	(no action)	Min
Reverse		Forward
Max		Max
Reverse		Forward

Centered

Position

FIGURE 82. Effect of deadband on joystick position vs. motor speed

Command Control Curves

The AX3500 can also be set to translate the joystick motor commands so that the motors respond differently depending on whether the joystick is near the center or near the extremes. Five different exponential or logarithmic translation curves may be applied. Since this feature applies to the R/C, Analog and RS232 modes, it is described in detail in “Command Control Curves” on page 48, in the General Operation section of this manual.

Left/Right Tuning Adjustment

When operating in mixed mode with one motor on each side of the robot, it may happen that one motor is spinning faster than the other one at identically applied power, causing the vehicle to pull to the left or to the right.

To compensate for this, the AX3500 can be made to give one side up to 10% more power than the other at the same settings. This capability is described in detail in “Left / Right Tuning Adjustment” on page 49, in the General Operation section of this manual.

Joystick Calibration

This feature allows you to program the precise minimum, maximum and center joystick positions of your R/C transmitter into the controller’s memory. This feature will allow you to use the full travel of your joystick (i.e. minimum = 100% reverse, maximum = 100% for- ward). It also ensures that the joystick’s center position does indeed correspond to a “0” motor command value.

Joystick calibration is also useful for modifying the active joystick travel area. For example, the figure below shows a transmitter whose joystick’s center position has been moved back so that the operator has a finer control of the speed in the forward direction than in the reverse position.

122 AX3500 Motor Controller User’s Manual Version 1.9b. June 1, 2007