RoboteQ AX500 manual Analog Deadband Adjustment

Analog Deadband Adjustment

Voltage at Input

5V
		1K Pot
4V
3V
10K Pot		100K Pot
2V
1V
0V
Min	Center	Max

Potentiometer Position

FIGURE 64. Effect of the controller’s internal resistors on various potentiometers

Analog Deadband Adjustment

The controller may be configured so that some amount of potentiometer or joystick travel off its center position is required before the motors activate. The deadband parameter can be one of 8 values, ranging from 0 to 7, which translate into a deadband of 0% to 16%.

Even though the deadband will cause some of the potentiometer movement around the center position to be ignored, the controller will scale the remaining potentiometer move- ment to command the motors from 0 to 100%.

Note that the scaling will also cause the motors to reach 100% at slightly less than 100% of the potentiometer’s position. This is to ensure that 100% motor speed is achieved in all circumstances. Table 15 below shows the effect of the different deadband parameter val- ues. Changing the deadband parameter can be done using the controller’s switches (see “Configuring the Controller using the Switches” on page 171) or the Roborun utility on a PC (see “Loading, Changing Controller Parameters” on page 134).

TABLE 15. Analog deadband parameters and their effects

	Pot. Position resulting in		Pot. Position resulting in
Parameter Value	Motor Power at 0%		Motor Power at -/+100%
0	0%	2.5V	94%	0.15V and 4.85V
1	0% to 2.4%	2.44V to 2.56V	96%	0.10V and 4.90V
2	0% to 4.7%	2.38V to 2.62V	93%	0.18V and 4.83V

AX500 Motor Controller User’s Manual 97