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AX2500/2850 Motor Controller User’s Manual 109
Connecting to a Voltage Source
Connecting to a Voltage Source
The analog inputs expect a DC voltage of 0 to 5V which can be sourced by any custom cir-
cuitry (potentiometer, Digital to Analog converter).
The controller considers 2.5V to be the zero position (Motor Off). 0V is the maximum
reverse command, +5V is the maximum forward command.
The inputs’ equivalent circuit is show in Figure 63 below.
Notice the two 47K resistors, which are designed to automatically bring the input to a mid-
point (Off) position in case the input is not connected. The applied voltage must have suffi-
cient current (low impedance) so that it is not affected by these resistors.
Connecting a Potentiometer
Figure 64 shows how to wire a potentiometer to the AX2500/2850. By connecting one end
to ground and the other to 5V, the potentiometer acts as an adjustable voltage divider. The
voltage will thus vary from 0V when the tap is at the minimum position and to 5V when the
tap is at the maximum position.
The controller considers 2.5V to be the zero position (Motor Off). 2.5V is the potentiome-
ter’s mid point position.
47kOhm
10kOhm
47kOhm
AX2500 Internal Resistors
and Converter
Analog
Input 1 or 2
0V = Min
2.5V = Off
5V = Max
+5V
14
10
11
13
Ground
A/D
FIGURE 63. Analog input circuit