RoboteQ AX2850, User Manual, Page: 44 / 200

General Operation
44 AX2550 Motor Controller User’s Manual Version 1.9b. June 1, 2007
User Selected Current Limit Settings
The AX2550 has current sensors at each of its two output stages. Every 16 ms, this cur-
rent is measured and a correction to the output power level is applied if higher than the
user preset value.
The current limit may be set using the controller’s switches or the supplied PC utility. Using
the switches, 7 limits may be selected as shown in the table below.
Using the PC utility is it possible to set the limit with a 1A granularity from 15A to 120A
During normal operation, current limiting is further enhanced by the techniques described
in the following sections.
Temperature-Based Current Limitation
The AX2550 features active current limitation that uses a combination of a user defined
preset value (discussed above) which in turn may be reduced automatically based on mea-
sured operating temperature. This capability ensures that the controller will be able to work
safely with practically all motor types and will adjust itself automatically for the various load
conditions.
TABLE 4. Current limit settings using the switches
Setting Continuous High Amps
0 30A
1 45A
2 60A
3 75A
4 90A
5 - default 105A
6 120A
Position Sensor
Gear box
Position Feedback
FIGURE 18. Motor with potentiometer assembly for Position operation