Filter
Top Products
AX2500/2850 Motor Controller User’s Manual 43
Left / Right Tuning Adjustment
The AX2500/2850 is delivered with the “linear” curves selected for both joystick channels.
To select different curves, you will need to change the values of “E” (channel 1) and “F”
(channel 2) according to the table below. Refer to the chapter “Configuring the Controller
using the Switches” on page 153, or “Using the Roborun Configuration Utility” on
page 159 for instructions on how to program parameters into the controller.
Left / Right Tuning Adjustment
By design, DC motors will run more efficiently in one direction than the other. In most situ-
ations this is not noticeable. In others, however, it can be an inconvenience. When operat-
ing in open loop speed control, the AX2500/2850 can be configured to correct the speed in
one direction versus the other by as much as 10%. Unlike the Joystick center trimming tab
that is found on all R/C transmitters, and which is actually an offset correction, the Left/
Right Adjustment is a true multiplication factor as shown in Figure 17
The curves on the left show how a given forward direction command value will cause the
motor to spin 3 or 5.25% slower than the same command value applied in the reverse
direction. The curves on the right show how the same command applied to the forward
TABLE 9. Exponent selection table
Exponentiation Parameter Value Selected Curve
E or F = 0 Linear (no exponentiation) - default value
E or F = 1 strong exponential
E or F = 2 normal exponential
E or F = 3 normal logarithmic
E or F = 4 strong logarithmic
20
40
60
80
100
0
20
40
60
80
100
- 20
- 40
- 60
- 80
- 100
20
40
60
80
100
% Forward
(Motor Output)
0%
3%
5.25%
% Reverse
% Command Input
20
40
60
80
100
0
20
40
60
80
100
- 20
- 40
- 60
- 80
- 100
20
40
60
80
100
% Forward
(Motor Output)
% Forward
(Motor Output)
0%
-3%
-5.25%
% Reverse
FIGURE 17. Left Right adjustment curves